Jump to content

Search the Community

Showing results for tags 'North Texas'.

More search options

  • Search By Tags

    Type tags separated by commas.
    Tags should be keywords or key phrases. e.g. carcharodon, pliocene, cypresshead formation, florida.
  • Search By Author

Content Type


  • Fossil Discussion
    • General Fossil Discussion
    • Fossil Hunting Trips
    • Fossil ID
    • Is It Real? How to Recognize Fossil Fabrications
    • Partners in Paleontology - Member Contributions to Science
    • Questions & Answers
    • Fossil of the Month
    • Member Collections
    • A Trip to the Museum
    • Paleo Re-creations
    • Collecting Gear
    • Fossil Preparation
    • Member Fossil Trades Bulletin Board
    • Member-to-Member Fossil Sales
    • Fossil News
  • Gallery
  • Fossil Sites
    • Africa
    • Asia
    • Australia - New Zealand
    • Canada
    • Europe
    • Middle East
    • South America
    • United States
  • Fossil Media
    • Members Websites
    • Fossils On The Web
    • Fossil Photography
    • Fossil Literature
    • Documents


  • Anson's Blog
  • Mudding Around
  • Nicholas' Blog
  • dinosaur50's Blog
  • Traviscounty's Blog
  • Seldom's Blog
  • tracer's tidbits
  • Sacredsin's Blog
  • fossilfacetheprospector's Blog
  • jax world
  • echinoman's Blog
  • Ammonoidea
  • Traviscounty's Blog
  • brsr0131's Blog
  • brsr0131's Blog
  • Adventures with a Paddle
  • Caveat emptor
  • -------
  • Fig Rocks' Blog
  • placoderms
  • mosasaurs
  • ozzyrules244's Blog
  • Sir Knightia's Blog
  • Terry Dactyll's Blog
  • shakinchevy2008's Blog
  • MaHa's Blog
  • Stratio's Blog
  • Phoenixflood's Blog
  • Brett Breakin' Rocks' Blog
  • Seattleguy's Blog
  • jkfoam's Blog
  • Erwan's Blog
  • Erwan's Blog
  • Lindsey's Blog
  • marksfossils' Blog
  • ibanda89's Blog
  • Liberty's Blog
  • Liberty's Blog
  • Back of Beyond
  • St. Johns River Shark Teeth/Florida
  • Ameenah's Blog
  • gordon's Blog
  • West4me's Blog
  • West4me's Blog
  • Pennsylvania Perspectives
  • michigantim's Blog
  • michigantim's Blog
  • lauraharp's Blog
  • lauraharp's Blog
  • micropterus101's Blog
  • micropterus101's Blog
  • GPeach129's Blog
  • nicciann's Blog
  • Olenellus' Blog
  • nicciann's Blog
  • maybe a nest fossil?
  • Deep-Thinker's Blog
  • Deep-Thinker's Blog
  • bear-dog's Blog
  • javidal's Blog
  • Digging America
  • John Sun's Blog
  • John Sun's Blog
  • Ravsiden's Blog
  • Jurassic park
  • The Hunt for Fossils
  • The Fury's Grand Blog
  • julie's ??
  • Hunt'n 'odonts!
  • falcondob's Blog
  • Monkeyfuss' Blog
  • cyndy's Blog
  • pattyf's Blog
  • pattyf's Blog
  • chrisf's Blog
  • chrisf's Blog
  • nola's Blog
  • mercyrcfans88's Blog
  • Emily's PRI Adventure
  • trilobite guy's Blog
  • xenacanthus' Blog
  • barnes' Blog
  • myfossiltrips.blogspot.com
  • HeritageFossils' Blog
  • Fossilefinder's Blog
  • Fossilefinder's Blog
  • Emily's MotE Adventure
  • farfarawy's Blog
  • Microfossil Mania!
  • A Novice Geologist
  • Southern Comfort
  • Eli's Blog
  • andreas' Blog
  • Recent Collecting Trips
  • retired blog
  • Stocksdale's Blog
  • andreas' Blog test
  • fossilman7's Blog
  • Hey Everyone :P
  • fossil maniac's Blog
  • Piranha Blog
  • xonenine's blog
  • xonenine's Blog
  • Fossil collecting and SAFETY
  • Detrius
  • pangeaman's Blog
  • pangeaman's Blog
  • pangeaman's Blog
  • Jocky's Blog
  • Jocky's Blog
  • Kehbe's Kwips
  • RomanK's Blog
  • Prehistoric Planet Trilogy
  • mikeymig's Blog
  • Western NY Explorer's Blog
  • Regg Cato's Blog
  • VisionXray23's Blog
  • Carcharodontosaurus' Blog
  • What is the largest dragonfly fossil? What are the top contenders?
  • Hihimanu Hale
  • Test Blog
  • jsnrice's blog
  • Lise MacFadden's Poetry Blog
  • BluffCountryFossils Adventure Blog
  • meadow's Blog
  • Makeing The Unlikley Happen
  • KansasFossilHunter's Blog
  • DarrenElliot's Blog
  • jesus' Blog
  • A Mesozoic Mosaic
  • Dinosaur comic
  • Zookeeperfossils
  • Cameronballislife31's Blog
  • My Blog
  • TomKoss' Blog
  • A guide to calcanea and astragali
  • Group Blog Test
  • Paleo Rantings of a Blockhead
  • Dead Dino is Art
  • The Amber Blog
  • TyrannosaurusRex's Facts
  • PaleoWilliam's Blog
  • The Paleo-Tourist
  • The Community Post
  • Lyndon D Agate Johnson's Blog
  • BRobinson7's Blog
  • Eastern NC Trip Reports
  • Toofuntahh's Blog
  • Pterodactyl's Blog
  • A Beginner's Foray into Fossiling
  • Micropaleontology blog
  • Pondering on Dinosaurs
  • Fossil Preparation Blog
  • On Dinosaurs and Media
  • cheney416's fossil story
  • jpc
  • Red-Headed Red-Neck Rock-Hound w/ My Trusty HellHound Cerberus
  • Red Headed
  • Paleo-Profiles
  • Walt's Blog
  • Between A Rock And A Hard Place
  • Rudist digging at "Point 25", St. Bartholomä, Styria, Austria (Campanian, Gosau-group)
  • Prognathodon saturator 101


  • Calendar


  • Annelids
  • Arthropods
    • Crustaceans
    • Insects
    • Trilobites
    • Other Arthropods
  • Brachiopods
  • Cnidarians (Corals, Jellyfish, Conulariids )
    • Corals
    • Jellyfish, Conulariids, etc.
  • Echinoderms
    • Crinoids & Blastoids
    • Echinoids
    • Other Echinoderms
    • Starfish and Brittlestars
  • Forams
  • Graptolites
  • Molluscs
    • Bivalves
    • Cephalopods (Ammonites, Belemnites, Nautiloids)
    • Gastropods
    • Other Molluscs
  • Sponges
  • Bryozoans
  • Other Invertebrates
  • Ichnofossils
  • Plants
  • Chordata
    • Amphibians & Reptiles
    • Birds
    • Dinosaurs
    • Fishes
    • Mammals
    • Sharks & Rays
    • Other Chordates
  • *Pseudofossils ( Inorganic objects , markings, or impressions that resemble fossils.)

Found 52 results

  1. Please Help

    Hello, I recently collected these fossils in the Minerals Wells area in North Texas, and I am not having any luck identifying the fossils. I know that I found the fossils in Pennsylvanian age sediment, and that’s about it. I really appreciate everyone who takes the time to help me.
  2. I found this Phlycticrioceras trinodosum heteromorph specimen in June of 2018 whilst hunting the middle/upper Coniacian Atco formation. It is the largest fragment of this species that I am aware of, having a whorl height of 51 mm as opposed to 47 mm of the largest fragment I've seen published. This genus is a bigger, rarer, and (mostly) younger cousin of Allocrioceras. I sent pictures of it to Keith Minor and he pointed out that there was also an echinoid sticking out of the specimen, something which I had totally missed! With much of the echinoid still stuck in the living chamber it is hard to get a definitive ID. But because it has such a shallow anterior ambulacra, which gives the anterior end a more smooth rather than definitive heart shape, he ruled out both Mecaster texanus and batensis. He suggested Micraster since the site has a strong European component in both the bivalve and ammonite faunas, and because the periproct side has the right shape. From finding other, although not as well preserved specimens that show similar morphology he appears to be right. I have yet to confirm this ID with Andrew Smith, but either way I think the piece is worth showing. And reading this thread got me thinking about how this could have happened and what effect it could have had on the echinoid's preservation. My thought is that because irregular echinoids lived and today still live most of their lives burrowing in the sediment it is unlikely that it would have crawled into the living chamber, but instead that it was blown into it post-mortem via currents that had dredged it out of the sediment. I already know that this site was a high energy environment from my other finds here so this seems the most likely possibility to me. But because of the fact there is still at least one spine still attached to the specimen it could not have been swept up from the sediment too long after death or all of its hairlike spines would have blown away. I do, however, find it interesting that it is positioned anterior first with its posterior towards the aperture, the position I would expect to see it in if it had indeed crawled into the shell. The specimen is also the best preserved echinoid from this site so far. Despite the ammonites being generally well preserved and not too crushed, most of the echinoids that I have from the site are terribly crushed, flakey, and often infested with rotting pyrite. I think being encapsulated in the chamber very much reduced those effects. Even though the ammonite and the echinoid are a bit crushed, the echinoid would have probably been worse off otherwise. The heteromorph fragment length is 70 mm and the whorl breadth, being a bit crushed, is 13 mm. I would think that this specimen, with its open planispiral coiling, would would have been at least over a foot in diameter when complete. It is the robust (female) morph of the species with a rib index of 5½. For comparison in Fig. 1 I pictured it with my most complete P. trinodosum specimen. From the part of the echinoid that is exposed I can measure 25 mm in length, 25 in width, and a thickness of 8 mm. I have also found abundant yet scattered fish remains at the site, so perhaps one day an ammonite-fish will come my way. But until then, anyone else got ammonite-echinoids to show? Fig. 1. Fig. 2.
  3. I found this today while I was out seeing if I could find more pieces of my bison. It was at the same level as the bison, but about 30 feet down the creek. It is turtle or tortoise, but I’m not sure what kind or if it is modern or Pleistocene. I looked through a Texas turtle database and did not find a match with any listed there. So it leaves me wondering if it could be an extinct variety. The shell patterns are so distinctive I’d think it could be ID pretty close to what it is. Here are pics. Any thoughts or or comments would be appreciated.
  4. My girlfriend recently found this vertebra at the Duck Creek Formation in North Texas. Was a bit of a surprise, didn't expect to find a vert at this locality, which is known more for ammonites, echinoids, and bivalves. One side of the vert has been prepped. Any help with an ID would be greatly appreciated. Thanks! And for those that have kindly enhanced the brightness on my previous pics, no worries! I did it myself this time.
  5. Possible Bear Claw?

    Need help identifying this claw. Found in Dallas. There is clearly a hollowed out indention on one side that does not go through (lighter area due to cleaning to see if hole went through) and a notch-like indention on the other. The top edge of the claw appears to have been chiseled, as there are distinct chisel marks that go around the entire top of the claw Could this claw have been made into ancient jewelry or tool artifact?
  6. Possible fossil?

    Hello everyone hope everyone had a great Thanksgiving! My father got to work yesterday and found this during their construction job. He said it was 9ft underground and says that the black sphere is heavy like metal and popped right out of the rock. Is this a fossil? Thanks for any tips!
  7. Possible fossil?

    My father just found this today in North Texas at his job site, is this also an ammonite? It's pretty big. It was dug up 9ft under ground.
  8. Hello all, I have been a long time lurker and decided to finally have a voice. I am a long time rock lover, and unfortunately am in the beginning stages of trying to learn everything I forgot as a child, ie. I am happy to take constructive criticism. I have been traipsing through muddy creeks and cut roads looking for rocks that are interesting. I happened across the embedded rock a week ago and I don't know where to begin in the identification process. The picture attracted is on a slope that leads to a creek in Richland Hills, TX, just east of Fort Worth. I assume the city cemented rocks together to prevent erosion and they did a really great job. This fossil(?) is about 8 inches by 10 inches and appears to be a rib cage. Would anyone be able to help me in determining the proper steps to take to identify what type of animal this was?
  9. Possible fossil?

    Hi everyone, I'm new here, so I want to apologize up front if my posts aren't as descriptive because I am very new to this. My father is currently working on a "construction" job, in north Texas that requires him to dig 9ft underground. He has found various things and he wants to know if they are fossils. Here is something he found yesterday: Thanks in advance!
  10. Mastodon or wooly mammoth

    Dug up from the sand about 30 feet below ground close to the red river
  11. Funky Kamp Ranch Cretodus

    A few weeks ago I was working an exposure of the middle Turonian Kamp Ranch member of the Arcadia Park Formation in North Texas, using a chisel and the natural bedding planes to pull up slabs. I had been there less than 15 minutes and had only found one small, broken tooth amongst shell hash when I found this almost perfect medium sized Cretodus crassidens. I also found some smaller shark teeth including Ptychodus sp., miscellaneous vertebrate material, and ammonites of possibly multiple species. So far this specimen is my largest from the site The first thing I noticed about it was the white color of most of the enamel and strange patterns covering the exposed tooth. It looked like it had been recently exposed and weathered, but since it was only exposed by me pulling up slabs that is not possible. All the other teeth I found there didn’t have this type of preservation but had the normal brown enamel. I have searched for pictures of any other teeth with patterns like this, but so far nothing. I prepared it out of the rock and can see that the patterns occur on both the front and back of the blade and root. It is 35 mm diagonal and 25 mm root width. It was resting just a few millimeters above a large inoceramid shell. The tooth is perfect except that the tip of the left cusp broke off before fossilization. There are certain areas where the blade isn’t white and there are no patterns, but for the most part the pattern covers the tooth. I was also able to rub off a bit of the white with my finger, but it seems that the patterns are embedded in the tooth itself since it is also on the root. Here are some pictures. I am hoping the origin of these patterns can be explained and any links and/or pictures of other teeth like this can be provided. The first three are before prep and the rest are after. Thanks in advance! FIG 1. FIG 2.
  12. What in the world have I found here?

    Good afternoon everybody! What in the name of Sam Heck is this. I wish I had taken a picture of how I found it.... I was following a large embankment downhill one morning, taking a hike through some thick woods that take up the west side of my apartment complex in Lewisville, Texas. Right where the buildings stop and the woods start there is a small, (maybe 3/4 of an acre) pond I've fished for years, and the embankment on the west side leads out to about 80 or 90 acres of very interesting land, which is some of the last undeveloped land here in north Texas. Only about 10 miles from 27,000 acre lake Lewisville, and the hundreds of miles of CORP of engineers land that surrounds the lake. Anyways, as I was following the small spillway creek downhill that flows into a smaller pond in the woods, I came across this thing sitting right smack in the middle of the small creek channel, carved out gradually as water ran from the (what I assume to be) man-made pond. Probably over the course of the past 15-20 years would be my guess. Very thick woods, I can confidently vouch I've been the only one that has been out in those woods in the past year at least, that particular area who knows. I'm 22 and I've grown up fascinated by nature and the pursuit of anything outdoors, always enjoyed finding arrowheads on my ranch, and other fossils throughout my expeditions (which I am super excited to post about in the future, this website is bad to the bone man!) But never anything like this. Any help with identification would be greatly appreciated y'all!
  13. Hi all! I just joined this forum and want to thank everyone upfront for such a great resource and community. My wife and I recently relocated to north texas from upstate new york. We fossil hunted up there and since we moved to texas have found some great specimens. It has been amazing having the opportunity to hunt new deposits! Last weekend we went to mineral wells and post oak creek...both places we found from reading this forum! I think a lot of what we found is quite common but definitely very different from what we are used to in New York. We found shark teeth, shells, corals and some stuff we cannot identify...We even found what looks like a piece of native american pottery (reddish square on right side. Thanks again for looking and let me know if you see anything interesting. We are eager to learn!
  14. Post Oak Creek Texas Finds

    Hi all. Firstly I would like to thank everyone for this amazing resource. I just joined the forum today and am excited to start sharing. My wife and I recently moved to north texas from upstate new york. We did a lot of hunting up there and have continued our passion since our move. We had a great haul last weekend, but there are a few specimens that I have never seen before and I was wondering if anyone could help identify. Please accept my apologies up front if these are common as we are definitely still learning and we are not familiar with the deposits here in texas. I believe the deposit is cretaceous. We found many more than this but as I said these are some of the more unique finds. If you need closeups let me know! Thanks again!
  15. I have found several of these at the Pennsylvanian Sub-period site in Jacksboro Texas. I've always had a good idea of what they were and never thought others might have different views until I brought up the question. If you know or have ideas post a reply and lets get a consensus of opinions before I say what I think. I didn't post this in “fossil ID” because I think I already know and I also want to discuss why they appear the way they do so give your opinion of that too. I recently found some that suggest an answer to that too. They may have already been discussed or even written about so if you know of a paper or old topic on them please post a link. I couldn't think of a good term to use for a search. Scale is mm.
  16. Bone like fossil with cuts

    Found this bone like fossil while exploring the creeks in far north Dallas. This area I believe is part of the Austin chalk formation. whats odd is the two small cuts and what looks like worms fossilized on the underside. It’s hard like rock.
  17. At a site where I have been finding heteromorphs, I have recently come across some vertebrate material. So far I have only found three vertebrate specimens; one bone fragment and two fish scales. I am hoping to get some information on their affinities. I am most interested in the fish scales, since it seems they would be the most easily identified. The site is in North Texas, the Austin Chalk group, Atco formation, upper Coniacian stage. For biostratigraphic reference, at this same site I have also found the ammonites Protexanites planatus, Phlycticrioceras trinodosum, Tridenticeras peramplum, Scaphites semicostatus, and Glyptoxoceras sp., among others. The bone (Figs 1-17) was found on Saturday the 14th of July. It is a small fragment from a more marly layer than the fish scales and most of the rare ammonites that I am finding are from, but still from the same site. The main part of it has 39 mm exposed length wise as shown in Figs 11-12 (some of it is still buried in the rock), and has a branch coming from the main part that is 22 mm long that forms a depressed canal structure in the rock (Fig. 14). The maximum thickness of the specimen that I can see is about 2 ½ mm. The branch begins to curve around when it meets the main part of the bone. The other end of the rock and the underside don't show much exposure of the bone except for a few bits poking through (Figs 16-17). I don’t know if the specimen came from a fish or some other vertebrate, but I would guess fish. If anyone can give more information on what kind of animal this came from and where this might have been located in the animal’s skeleton, that would be much appreciated. But I also know that due to its very fragmentary nature, a more definite identification may not be possible. The two fish scales (Figs 18-20) were both found on Friday the 27th of July over 100 yards from where the bone was found. These specimens are from a more chalky matrix than the bone, the same matrix that the rare ammonites are in. The first specimen (Figs 18-19) was found breaking open a large chunk of chalk. It is basically flawless and in excellent condition, and only has a little bit of obscuring matrix on the right side that could be prepped off. In the same chunk of rock that I cracked open to find this I also found a T. peramplum specimen. The fish scale is 5 ½ mm long by 5 ½ mm wide. The second fish scale I found (Fig. 20) was found within a few feet of the first one, possibly from the same fish specimen. It is a bit beat up and less complete than the first scale, but is larger from what I can see. It is 7 mm wide including the flatended area upon which the scale once was before it flaked away during excavation. The front part of it is still buried in the rock but could hopefully be prepped out. It is also in a chalky chunk of rock, not marly. I have noticed that these are less shiny than scales preserved in shales, though they still do glimmer a bit in direct light. They are also differently colored than most fish scales preserved in shales, with mine being on the red/brown spectrum while those in shale are usually black or dark gray. I am hoping that the distinctive symmetrical 7 way splitting shown on the first fish scale could narrow down the identification. I know that getting to the species or genus level could be very difficult, but could a family or order be at least possible? I have heard that identifying fish scales is challenging, but this paper indicates that it is not impossible. @oilshale, you’re a fishy guy (in a good way of course). Any ideas? Fig. 1.
  18. I recently went hunting for my first time in the Turonian Arcadia Park Formation, an Eagle Ford group shale formation in North Texas. I found some great fossils, but many of them are fragile. I found a Worthoceras sp. specimen in matrix that seems to be on the verge of falling apart, and a very small Metoicoceras sp. specimen in a similar situation. They both have the nacreous shell preserved. Many of the other ammonites that I found tend to flake bits of the white shell while I am handling them. What can I use to consolidate the specimens so that they don’t fall apart and so that the shell doesn’t flake off? Will the consolidants dampen the beautiful iridescence of the shells? Here the two most fragile specimens, the Worthoceras sp. and the small Metoicoceras sp.: FIG 1: Worthoceras sp. FIG 2: Metoicoceras sp.
  19. Giant Inoceramus clam?

    I am a bit excited and probably rash in my thinking on this. I’m sitting in a creek and I believe I’m sitting on the remains of the largest clam I have ever seen. I’m having a hard time processing it and don’t know how to confirm my suspicions of how large this beast is. Would anyone even be interested in checking this out? Here are some pics. If I am correct this clam goes at least from a foot to the right of the black thing to at least 3 feet to the left of my hammer. This is is a layer of shell across the top of it. More shell Sounds like I may have an overactive imaginations, but I’m not sure how to explain it otherwise. What do you guys think?
  20. Fossilized wood?

    There are two samples here that may be petrified wood. The first one I have several pictures of and I am not sure about. The second one I only have one or two photos but I am fairly confident, just need validation.
  21. Is this some sort of tooth?

    I found this on a knoll overlooking a lake. It looks a little like a fossilized tooth to me. Any thoughts?
  22. Should Bone Cow/Bison/?

    Found this in the waters of a local North Texas stream. I'm assuming it is a old cow bone. But if you see something different, let me know! I'll go search for the rest of it!
  23. I had about an hour and a half to go hunt for fossils today. Someone had been asking to go hunting with me and today was the only time I’d be free to go until after New Years. There has been a lot of construction on highway 75 in McKinney, TX and they took a lot of the rock dug up during construction and dumped it in a field by 75 just north of the county courthouse on the east side of 75. I had seen the piles of construction rock several times and wanted to check out what fossils might be in the McKinney underground. I doubted there would be much of interest, because it’s the Austin Chalk and I live near and on it and there are very few fossils in the chalk that are preserved well and they are mostly chalk clam casts from what I’ve seen. The other things I’ve seen where the actual clam was preserved mostly had fragments of the shell and nothing whole. But I was hoping if it had been dug up maybe it would be preserved better. No such luck, but it was interesting to see. Here are a few pics I took. There were lots of clam remnants, some quite large. Someone can correct me if I’m wrong, but I believe they are Inoceramus clams. This was the dump site. It had been there a while. This is a good example of the colors you will see. The brown to taupe color (on the right) I believe to be the outer layer of the original shell. The yellow and rust color (on the left) is where the original shell pulled away from where the clam was when the chalk split. This slab is about 2 feet long and about as much wide at the top. You can see numerous layers with clam spanning the whole width and length. Sometimes multiple clams were overlaying one another. I put my key fob on this for scale. I think there were 2 clams here. One on top left and another that is only a fragment, but still looks to have been well over 12 inches wide. There were a few specimens where the whole layer of the outer shell was preserved fairly well. This is one of them. I put my hand in the pic for approximate size. I think my hand is about 8 inches long. So this clam was about 5 inches wide. I left my heavy duty hammer and chisel in the car. I tried breaking the rock so I could carry it out, but I didn’t manage to break it. Heres another one of similar size. This one must have been quite large by my estimation, but nowhere near as big as Inoceramus clams get. I read in Wikipedia that one over 3 meters had been found. This could easily have been 20 inches across or more. Most all of the slabs were 2 feet plus. The chalk often split or broke easily, but it was hard to pull apart in the plane of the clam shell in one piece. The fossils were quite fragile and not of the best quality, but they were cool to see. It was an interesting visit, but I wasn’t able to bring much home sad to say.
  24. Looks like petrified wood chips?

    Our class found these along the creek walls that border the school's property. They look like large petrified wood chips, but we are wondering if you can tell us what they might be. Part of the schools property is considered preserved wetlands. This might be a reason these are here.
  25. On November 27 of this year my mother and I went hunting in a new housing development exposing the Austin Chalk in North Texas. The first and only site that we got to was covered in this rock that has been brought in from somewhere else. It was odd in that it looked like someone had just poured a bunch of it in an empty lot in no particular pattern. It was all next to a man made hole in the ground in the middle of the lot, but I don't see how that could be related. We have seen bags of this matrix in drainage ditches before and had also seen it variously thrown about at different Austin Chalk sites. I had found a few things in it that were intriguing, but for some reason I had largely (and very incorrectly) assumed that there was probably not much that one could find in it, so I never seriously hunted it. But my mother proved me very wrong! When we got to the site and I saw that much of it was covered in this stuff, I was somewhat annoyed since it was covering up some of the Austin Chalk. But we both got out anyways and began hunting. I went off towards the ditch where more of the Austin Chalk was exposed while she was looking around in the foreign matrix. I wasn't having much luck and she was commenting on how she was seeing some layered patterns in the matrix, pictured in F31. I didn't think much of it and kept hunting away from the pile of unknown matrix. Then less than a minute later my mother let out something along the lines of, "Hey! Hey! Hey! What is this?!" When she does that, I know she is not kidding around! So I went over there and saw her pick this up off of the ground. We both immediately knew that it was an echinoid. What made this specimen really special are the facts that this is the largest or at least second largest echinoid that we have ever found, the first echinoid from a formation other than the Austin Chalk, and our first regular echinoid all in one. Its a sad thing that it is so beat up, but then again its not surprising since it was probably hauled in a bag in the back of some guy's pickup for possibly hundreds of miles. Only two tubercles that have not been knocked off are visible, though perhaps there are one or two more buried under the chunk of matrix stuck to the side of the specimen. It is also missing most of its adoral side and most of its apical disc, with bits of the disc still in the depression that is left. Its test is pretty scuffed up in general, but at least most of it is still left and I don't think that it is too beat up to be identifiable. I took pictures of the site while I was there (pictures in F1-F4) and brought home a lot of matrix to experiment with and to photograph later to aide in identifying the formation from which it came. When I got home I consulted @Bill Thompson's book on Texas echinoids and I have been able to narrow this specimen down to the genus Temnocidaris for sure. I am hoping that you guys can help me find out what formation the matrix came from, which would greatly help to narrow down the species possibilities. Out of the four species of Temnocidaris listed in Thompson's book as being reported from Texas only two of them have there tests pictured, T. borachoensis and T. hudspethensis, with the other two species only described from their spines. Now I am not an echinoid expert by an stretch of the imagination, but I am personally leaning towards this being T. borachoensis from the Boracho Formation of Upton county or a nearby county in West Texas. My reasoning is twofold: First, to me its test much more resembles T. borachoensis than T. hudspethensis in two ways. They are that the interabulacrum tubercles are closer together than T. hudspethensis and that its test is a bit more squat than T. hudspethensis, even if it still had its base. Coincidently, just a little over a month ago @KimTexan posted for identification a Temnocidaris specimen from the Edwards Formation of Johnson county that very much resembles mine, though I can't say for sure it is the same species as mine since her specimen is missing much of its aboral side while mine is missing much of its adoral side, making a comparison between them a bit difficult. Second, from what I have seen the matrix most closely resembles the San Martine member of the Boracho Formation. If I want to learn a bit about Texas paleontology that I didn't know before I will usually look up one of @Uncle Siphuncle's Fossil hunting reports. Here is one which contains pictures of a lot of matrix and a few fossils from the Boracho formation, starting with Figure 91. The most striking resemblance I see is that the matrix has a lot of red/orange matrix streaks running through it like mine does. But because I have never hunted in the Boracho Formation other than possibly this brought in matrix, I don't know for sure. I also noticed what appears to be the same layered fossil shown in F31 in Figures 136-138. After seeing this post, I tend to think that it is oyster related material. This matrix is a lot more dense than the Austin Chalk that I am used to, making it noticeably heavier. It bubbles when I put vinegar on it indicating that it is limestone, though perhaps not as vigorously as vinegar on the Austin Chalk. I scraped some matrix with a dentist's pick in the places weakened by vinegar and places I didn't treat with vinegar, and while it did scratch the limestone matrix, the untreated matrix was harder than untreated Austin Chalk. I have tried to see if the sandy red/orange matrix bubbles, but my experiments were inconclusive because the limestone is always nearby, skewing the results. I would assume that it does not bubble on its own. After cleaning the echinoid, a few other fossils, and chunks of matrix, the toothbrush fibers had turned orange indicating that the sandstone it is not that hard, at least when wet. Also the limestone matrix is just packed full of calcite crystals, which is very noticeable in direct sunlight! The specimen its self, excluding any matrix, is 53mm in diameter by 36mm in height, though it would be taller if it still had its base. It appears to me that it is only infilled with the sandstone while there is an actual limestone chunk stuck to the side of it, shown specifically in F12. Notice the red patch on the matrix, a characteristic not unique to this chunk but seen on another chunk of matrix shown in F32. All of the pictures were taken in sunlight, so the color that you see is how it really looks. Thanks for any help in advance. F1-F4. On site photos. F2 F3