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Found 34 results

  1. More Kingsbury TX finds

    Hi everyone! Holidays mean more time to photo and post. As previously mentioned in my previous post, I am finding a lot of fossil impressions and voids in chert and mudstone on a small artist residency and farm in Kingsbury, Texas, in Guadeloupe County. And some petrified wood. Most of the casts I find are pelecypods and some gastropods; however I am finding some other stuff, some of it total mystery. This time I will post the mystery items first. Let me know your thoughts! This first mystery (3 views) has tight incised lines around the darker shape - most evident in central photo. The next item, below, has lots of impressions. The closeup on right shows a spiral on left side, is that a worm, or a gastropod internal cast/mold? I think the horizontal cavities on right of closeup are some kind of coral? Here's some coral ... or petrified wood? (two images Photoshopped together) And also...the below is super interesting...at first I thought it was just a chip, or a shell impression. But starting to think insect wings! At first I thought this could be a bryozoa (left photo below), but I think it is more likely a worn pelecypod impression, re like the typical one on the other side other rock (right photo). And here's some pet wood, various types And bone? Or coral? I keep thinking bone because of smooth sides.
  2. Hi everyone! For the last few months I have been finding lots of fossil imprints in mixed chert cobble on a artist residency/farm in Kingsbury, Texas near Seguin (in Guadeloupe county). They are digging up some of the cobble/gravel to line the roads and walkways on the farm, which means that everything gets spread out nicely! Plus there is the 'quarry' itself. The USGS map says that the area is Wilcox Group, undivided, and/or Willis Formation, and I am looking at mudstone, chert, a little bit of sandstone, gravel, some petrified wood. In terms of age I think it matches up with Eocene but could go back a little farther, especially since some stuff may have been deposited by a nearby creek. For Wilcox Group USGS says AGE_MINPhanerozoic - Cenozoic - Tertiary-Paleogene - Early-Eocene AGE_MAXPhanerozoic - Cenozoic - Tertiary-Paleogene - Late-Paleocene. I am using the two classic Texas references to ID general fossil type, Matthew's Texas Fossils and also Finsley's A Field Guide to Fossils of Texas, and also deeply perusing thefossilforum.com site. I think the below is a stromatolite, then the rest are pelecypod impressions of various types. Except for that last photo in this post, I am guessing that is just a sideways cross section. I am curious as to your opinions... it has been really fun to look and to find these! I will add more images in subsequent posts.
  3. Banded chert or shell?

    leaning toward banded chert but double checking... found a couple of these....interesting stone.
  4. large chert nodule

    I'm currently working with a monster nodule. 14.5 inches around. Had some chipping at the bottom with a small amount on one side. After several freeze/thaws the whole lower section is now exposed from chipping & flaking with the smaller area on the side enlarged as well. Nice off white, almost powdery exterior with a med dark brown interior. I'm hoping there's at least something in it and that the something is larger than a pea. Nodule has this tiny, curious almost nipple like area on top. Anyone have any experience with one this size? Am I possibly wasting my time? There are several hairline cracks showing here & there in the white exterior so far. My biggest problems are that I don't really know how long I should be soaking it, or freezing it or if it needs to be submerged in water while freezing. And of course, if I'm going to make it the whole way or end up whacking it with a hammer. Any helpful suggestions would be nice.
  5. I would like to better understand conchoidal fracturing of chert/flint. I have many pieces where the fracturing is obviously conchoidal, but some others where this isn't obvious. I'll post photos in hopes that knowledgeable folks can point out circular characteristics that I'm not seeing. In this first one I can see small conchoidal divots. It's the larger seemingly straight(long lines) fractures where I don't see conchoidal characteristics.
  6. I found this rock about 20 years ago while hiking a piece of property I was considering buying, which was perched on a high bluff over looking the Illinois River. I picked it up because of the beautiful druzy crystals on it. I have been cleaning quartz crystals this week, which I found a few weeks ago near Hot Springs, AR. I was using Iron out to remove the iron stains. Anyway, I have kept this rock in my kitchen window so it could catch the sunlight and sparkle for me all these years. It is not the finest home decor, but definitely my style. I picked it up today to see if it had any iron stains on it that might need to be removed. As I was looking at it something in the chert caught my eye! I’ve had this rock all these years, but never realized, to my great delight (squeal!!!), there were fossils in it until today. That just makes it all the more special and cool. The formation there is Keokuk and Reed, which is Mississippian. I think these may be Bryozoa, but I’m not certain. I’m not sure I’ve ever hunted a Mississippian formation and found much besides crinoid pieces. Note the little rice grain size/shape dark spots on the top right side. I saw them and began to wonder if they were fossils. I turned the rock around to look at all sides and saw these rice grain size and shapes that were clustered together. See top center just below the crystal. These look flat, but in the next pic they have more dimension. Rice grain size and shape center of pic. The bottom of the rock. Note bottom center it almost looks like a plant leaf of sorts, but I assume Bryozoa. I have not found many fossils in the area. I found a couple crinoid fragments on the nearby land that I ended up buying instead. So, I’m pretty sure these are marine fossils. A few miles away to the east in Arkansas, in the Boone Formation, I found 3 Spirifers and abundant crinoid stalk fragments. Can anyone confirm that these are Bryozoa and if so what type they may be? Thank you in advance for your comments and input. Kim
  7. Oolites or something more?

    I found this 40 lb chunk of what looks to be oolitic chert with some agate tubes running through it in east-central Minnesota while out agate hunting. Maybe it's considered a cold water agate, but I'm not really sure what that truly means anyways. Either way, I was wondering if there is something more to this structure besides oolites. Maybe some kind of coral or other reef building organism? Any more information would be great. Thanks!
  8. Fossil in chert?

    Chert from Bexar County, TX. If a fossil, what could it be?
  9. Plant fossils in flint?

    These were found in Bexar County, TX. They look like plants to me, but wanted to confirm.
  10. I found this along the Fox River in Elgin, IL. At first I thought it was a stromatoporoid fossil (I find them everywhere in this area), but upon closer inspection I couldn't see anything that looked like pillars or laminae. Someone suggested chaetetid sponge, or a stromatoporoid that was distorted by silicification. I can't find any photos that look like my spec. except dino bone and we don't have those in northern Illinois. Is it a natural formation, crazy looking oolites? I'm totally stumped! More pics
  11. Chert? Attempted tool?

    Thoughts? Found along a gravel bar in southern Minnesota
  12. Coastal fossil ID

    Hey all! I'm new to the forum so I thought I'd introduce myself with a find! I found this one while searching for artifacts in my historical geology class. The rock was found beside a dock located on a river right off the ocean (wilmington, nc). The location this rock was found in had several varieties of rocks including clay, siltstone, and scorria. This rock appears to be chert. It has glassy cleavage and banding along its side. It also reacts slightly with HCl. The small bore holes on the top surface come in pairs. My guess is that they were formed by Polychaeda? I am really having trouble identifying the marking on the front, however. They appear to look almost like tire tracks with several ridges along the edges is them. Can anybody help me ID this one? Here is a view from the side.
  13. Secondary Deposition

    Hello, I have a question about fossils and secondary deposition.... I am assuming from what I have read that secondary deposition occurs when creature is preserved in sedimentary rock. Over time softer structures will decompose and be filled in by secondary sedimentary rock such as chert. If this does occur does this alter the specimen and it is considered not a fossil??? Thank you for your help! Kim
  14. Fossiliferrous chert

    After my wonderful introduction yesterday, my research on chert discussed fossiliferrous chert. All indications in this chert lead to that. Could this have devonian fossils? Seems to have the same repeating pattern.
  15. Chert?

    This is the size of a US quarter. I put water on it. Don't remember where I found it - Michigan or Arizona. Is it chert?
  16. My husband and I were working on a Limestone boulder in Ocala. It had areas of chert , as well as a section of dark grey hard clay that was exposed after we broke and end off the main rock. The entire boulder had lots of bivalves, a couple of Gastropoda and echinoids. There were 4 items that I can't identify so I am including photos here. A few of them looked crystalline in nature ( drusy? ) Thanks for any help.
  17. possible fish or amphibian part

    I collected this after the grass burned, on a hilltop in NW Greenwood County, KS. I've not seen this before, but the chert has such detailed fossils that I expect someone will recognize this. Except for a couple of shark teeth (cladodus), I've never found a fish part. This reminds me of gills.
  18. Chert Nodules

    Is there any value in splitting chert nodules? I have a double nodule from near Fredericksburg TX appx 16" long that I am curious to look into. One end has a 1/2" hole with a chert stem sticking out that is pretty interesting. If it is worth the effort, what method would be best used?
  19. Petrified wood on chert

    Could this be petrified wood attached to chert/flint? AAA batteries for scale. Size--3" length 1 1/2 "height 1 3/8" thickness
  20. Found in a rock

    I was looking for flint and when I broke this rock I saw this. I have tried to do some research on it without much luck. Found in Cedar County Missouri. According to the Missouri Geological website this county is about 90% Mississippian with a small amount of Ordovician. The protruding piece sticking out is 11/16ths" (1.8cm) in length and 1/2" (1.2cm) in width. The bottom piece is 1 1/4" (3.2cm) in length and 11/16ths" (1.8cm) in width. Thank You for any help that you might give. I do have other pictures. Don in MO
  21. Fossilized bone segment found in creek bed in NE Alabama... Found near sandstone and chert in a dry creek. Definitely turned to stone... Could drive a nail and also sounds like rock when tapped. Will also add pics of other side and both ends.
  22. interesting pattern

    Hello, I came across this rock protruding from the bank along a spring in SE Austin. There was plenty of Flint around and a few mollusks. Thanks
  23. Permian Basin Sponge? fossil?

    I am studying the stratigraphy of the Permian Word Formation in the Glass Mountains of West Texas. Though there are obvious ammonite, brachiopod, and fusulinid fossils in the strata, I keep coming across these geometric patterns. Could someone help me identify the origin of these patterns? Are they fossils or some bizarre diagenetic process? There has been ample alteration of these limestones by silica(chert). vertical slice Horizon of sponges? above 'sand stringers' or silicification bands Plan view
  24. Life before oxygen: UC geologist uncovers 2.5 billion-year-old fossils of bacteria that predate the formation of oxygen. University of Cincinnati, November 29, 2016 http://magazine.uc.edu/editors_picks/recent_features/bacteria.html Ancient rocks hold evidence for life before oxygen, University of Cincinnati, Press Release, November 29, 2016 http://www.heritagedaily.com/2016/11/ancient-rocks-hold-evidence-for-life-before-oxygen/113484 https://www.sciencedaily.com/releases/2016/11/161129144840.htm Geologist uncovers 2.5 billion-year-old fossils of bacteria that predate the formation of oxygen by Melanie Schefft, PhysOrg, Nov.29, 2016 http://phys.org/news/2016-11-geologist-uncovers-billion-year-old-fossils-bacteria.html The paper is: Czaja, A. D., N. J. Beukes and J. T. Osterhout, 2016, Sulfur-oxidizing bacteria prior to the Great Oxidation Event from the 2.52 Ga Gamohaan Formation of South Africa, Geology. vol. 44, no. 12, pp. 983-986DOI: 10.1130/G38150.1 http://geology.gsapubs.org/content/early/2016/10/07/G38150.1.abstract Yours, Paul H.