Jump to content

Search the Community

Showing results for tags 'mudstone'.

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
  • Books I have enjoyed
  • 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 39 results

  1. This is a shot of a conglomeration of fossils in mudstone from the Verde Formation of central Arizona. This formation is a graben of jumbled types -- sandstone, limestone, mudstone, basalt, etc. These were in layers along a dry streambed. Any assistance with what they are would be appreciated. I'm assuming they are Pennsylvanian period, given the lack of crinoids. Locally, the redwall limestone is Mississippian, and contains abundant crinoids. The Martin limestones are Devonian, and have few fossils. I assume the pictured fossils are more recent than either of these. I'm especially curious about the items a few inches below my index finger that look like cross-sections of bone -- hollow with webbing inside. Thanks for any help you can offer!
  2. twisted rock-could it be coprolite?

    I found this in Eastern Colorado between Denver and Ft Morgan I thought it was mudstone, and had a lapidary cut it so I could see a cross section wondering if it could possibly be coprolite this piece is 5x4x4 inches -12x10x10 cm and if it doesn't show well in the images, it is twisted in appearance
  3. Mudstones?

    Hello all- I live in NC, the far Western part, but spend a lot of time in TN, at a man-made lake that was constructed as part of the TVA project, beginning in the 30s. The rocks and scenery around there have been stirred up and relocated with the construction of the lake, so it’s kind of difficult to say what ought to be where. That said, they consist mostly of rather uninteresting dolomite and quartzite in the forested areas, and then huge beach expanses of orange-tan to red to purple and even bluish clay-type slate or shale material that has hardened in spots to near-rock consistency. There are beautiful agates to be found in some banks of red clay, however, and there are also enormous, opaque, gray mudstones with intriguing shapes. I thought at first that the mudstones were some of the most boring-looking things I’d ever seen, with the utter lack of variation in their color, as if painted in dull, chalky gray, but that has changed. After attending several summers of lake recreation, I noticed that the rocks were becoming much more interesting, and paid more attention to them. It seemed that the mudstone was sloughing off of itself at a considerable rate, and that the materials that formed the center of the nodules were becoming exposed! The mudstone is gritty and slips off with repeated exposure to bioturbation, (I believe this is the correct term for tumbling by elements, no?), and as time passes, more and more fascinating things are turning up. Not all of the nodules contain a center item, but many do. Following a bit of research, I located this article: https://www.sciencedirect.com/science/article/abs/pii/0031018281900572 ...and some others that also describe fossils being found in the middle of such mudstone formations. What really surprised me was how identical to my setting the soils and rocks sounded in the article... Here are some photos of things that have come from the mudstones... Anyone have any thoughts on what these could be?
  4. Brachiopods

    One from yesterday. What we call Michigan Devonian mud stone. I would like info on the large Brachiopod type, Mucrospirifer ? I do realize it is partially missing. I am not sure if sodium bicarbonate will clean up a lot of areas? Or how much it is worth doing. images 2-3 I call the bottom side, showing material under the holes. Thanks.
  5. Trace fossils? Coral? Anemone? Worms?!?

    Hey there! This is my first post on The Fossil Forum. I don't have a lot of knowledge about fossils, but I sure do know how to find them. Hopefully these aren't too obvious and boring, but I'm incredibly curious anyway. I found these near Sheep Bridge north of Phoenix, Arizona. Here the Verde river has cut through deep layers of ancient lava, sandstone, mudstone, etc. I was exploring for crystals up on a steep hill along the river's canyon walls when I came across a whole lot of these things. They are very fragile and I didn't want to break apart some of the 2-3 foot wide boulders of them so as to preserve them for others to find. Anyway, my understanding is that this area was once a sea floor, so I'm assuming they are some type of coral, anemone or something similar. The fossils are composed mostly of the same sediment which encases them, so I suppose they must be trace fossils, but please correct me if I am wrong. Other not-so-filled-in ones even had crystals and other minerals lining the cavity. As well, I looked at a geological map of Arizona and the area I was exploring is composed of the following... Late to Middle Miocene Basaltic Rocks (8-16 Ma): Mostly dark, mesa-forming basalt deposited as lava flows. Pliocene to Middle Miocene Deposits (2-16 Ma): Moderately to strongly consolidated conglomerate and sandstone deposited in basins during and after late Tertiary faulting. Includes lesser amounts of mudstone, siltstone, limestone, and gypsum. There are a couple photos of some ball shaped objects which were very easy to knock apart from the surrounding stone. I have no idea what those could be. The rest of the photos are of the coral looking objects. Some of them, if still intact, were nearly 24 inches long, but I left those behind and only took smaller samples. Please note how the "head" of the corals appears to flare out and is larger than the rest of the stem. Finally, some of them appear to have a little node sticking out of the "head," but I suspect that may be due to weathering as these are very fragile fossils. Thank you all so much for your interest and help and I look forward to learning more!
  6. Does anyone have any tips or tricks for how to keep mudstone from cracking and delaminating as it dries out? I recently went to Clarkia in Idaho and came back with a few fossils, including a flower, wrapping them in newspaper and putting them in the fridge as was suggested. They are beginning to crack and delaminate. I was hoping someone could help me think of a way to keep them solid before the leaves are broken. Thank you.
  7. Hello everyone, I was able to make a run down to the Conasauga River trilobite hunting site yesterday that was suggested to me in another thread. I didn't have an overabundance of time, but within five minutes of arriving, I found the specimen in the attached photo. It's not perfect, but it's the first time I've ever found a fossil out in the wild. Thank you to everyone for pointing me in the right direction. Now, since my time was a bit limited, I collected a five gallon bucket of the mudstone found there to look through it later. Now, some pieces seem easier to split than others. I've read on here that some people will soak items like this in water for about 15 minutes before attempting to take it apart. Does that sound right? I just want to have a chance at finding something else and minimize the risk of ruining a fossil in my quest to find one. Thank you, -William
  8. Fish fossil identification

    Could you please identify these fish fossils?
  9. Would this rock have fossils?

    This is a very large boulder and it is layered. I took off a few layers and found nothing. I was wondering how old this boulder is and should I keep digging into it. Thanks for your help in advance.
  10. Leptaena

    I collected this Leptaena brachiopod from the red brown mudstone resting three feet above the top of the first out crop of breccia limestone. The location is above the rest-stop on highway 89 S before Riceville Rd. The formation is the lower part of the Kibbey. Leptaena Brachiopods dominate along with three types of bryozoa and crinoids. Also found clams and a part of a plant fossil. The setting was once a lagoon.
  11. 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.
  12. creek find 3

    Arundel Formation. Maryland. Lower Cretaceous. What say you?
  13. Creek 2

    Thoughts on this?
  14. Pseudo or other?

    I have been looking at this and can't decide if it's something or not. I leave it to the experts. Personally I thought concretion until I saw the belt. It looks like a squashed acorn, but I don't believe there were oaks in Lower Cretaceous. Thoughts? No, it's not a human artifact.
  15. NASA's Curiosity Rover Finds Chemical Building Blocks For Life On Mars, Morning Edition, June 7, 2018 https://www.npr.org/2018/06/07/617235884/nasas-curiosity-rover-finds-chemical-building-blocks-for-life-on-mars NASA finds ancient organic material, mysterious methane on Mars, June 7, 2018 by Sean Potter, NASA https://phys.org/news/2018-06-nasa-ancient-material-mysterious-methane.html https://www.jpl.nasa.gov/news/news.php?feature=7154 The abstract is at: Eigenbrode, J.E., Summons, R.E., Steele, A., Freissinet, C., Millan, M., and many others, 2018, Organic matter preserved in 3-billion-year-old mudstones at Gale crater, Mars. Science. Vol. 360, Issue 6393, pp. 1096-1101 DOI: 10.1126/science.aas9185 http://science.sciencemag.org/content/360/6393/1096 Yours, Paul H.
  16. Fossil rich matrix

    Just a post to show what this garden patch is made of. This is a typical bucket full of chunks turned up by the plow last year. This patch will be finally tilled this year and seeded over. (might come back later, tho) I guess this is called mudstone as it is just a solid glob of fossils. Here are some pics of one of the chunks before, and after splitting. Very busy in there and quite difficult to get it to split where you want, partly due to being exposed (partially) for a year. Working on the new plow, hope to bust up a new patch in the coming week. Regards.
  17. New air-abrasive set up

    Hi guys, a friend of mine is setting up a little prep workshop for us to use and asked me to find out about what sort of gritscan be used (we'll mainly be prepping teeth, scales bones etc. from a relatively soft mudstone), I know nothing about air -abrasion so was wondering if anyone could give me any advice, any help would be greatly appreciated! Sam
  18. Peace River Plant Impression?

    A friend and I went out on the Peace River yesterday. The river is the lowest I've seen...32" below normal, so much of the bank was exposed. In the area we were hunting, I decided to check out the mudstone bank...located between layers of limestone, and in separating a layer, I came the smaller impressions below. It looks so plant like to me: reminds me of the edges of hydrilla, but am so unsure what it could be. I included a close up so the finely tapered ends would show, as well as the somewhat ovoid edge impressions. I was excited, but I also know looks are deceiving. ( when I was first looking for fossils, I found a complete miniature leopard impression in a rock shown below) ...lol. but now, while I am beyond that, I am still a sucker for my eyes and mind want to be there. At any rate, I did check geology of the area, and we were in the Hawthorn group, probably , Arcadia formation, which does apparently contain mudstone, and plant fossils. Anyone care to hazard a guess, or perhaps you know for sure what the impressions are. So as to not waste anyone's time, I am trying to treat you with a couple of nice glyptodont pieces I found. My best pieces of the day, though my friend found a gorgeous unbroken 6"vertebra from something he has yet to identify. Sorry I don't have an image of that. Btw, the day was beautiful, water was crystal clear, and I got a workout dragging my kayak.
  19. Hi, Bit of a geological question here, I recently took this photo of some of the Upper Hamstead Member strata exposed on a headland at Bouldnor Cliff whilst out collecting. I really like this spot as the colour variation in the beds is really interesting. I've heard that the colour mottling in mudstones such as these can be indicative of the paleo-environmental conditions they were deposited in. Generally speaking these muds were deposited in ponds, lakes, and sluggish waterways on a low lying coastal plain. However, would it be correct to presume the redder areas indicate more arid conditions i.e. a period when the Hampshire Basin coastal plain was very dry and the other green and grey beds periods in which the environment on the plain was wetter? Thank you, Theo
  20. Bivalve with foot?

    Sorry for the shadow/light. The whole fossil is about an inch long. Is that the foot sticking out at top left? Or do you think it's just that the rest of the shell was broken off and never became part of the fossil? It's very soft mudstone (can scratch it with my fingernail), but I know soft parts don't tend to get preserved. This is another beach fossil, so I don't know anything about the age.
  21. Trace fossil or jellyfish

    Hi, I'd appreciate some help with this one, it's got me completely foxed and I can't find anything similar online. The matrix is a mudstone, it was a loose rock in a stream, the rocks in the area are all Brigantian (Upper Visean) - Carboniferous Cyclothem deposits (Northumberland, UK). There were 3 of these, all about an inch long, oval shaped, but fairly irregular, with faint radial lines/corrugations from a central 'spine'. They are three dimensional about a quarter of an inch thick. Small spiriferid brachiopod shell fragments in the same rock are undeformed, so I think the irregular shape is original. They remind me of small jellyfish but I think that's highly unlikely to have fossilised so I'm guessing some sort of trace fossil. All three are similar in shape and size so I'm wondering if there's a specific name for these, and whether it's known sort of creature made them? Cheers Steve
  22. Hi everyone! I was playing around with some matrix fragments from the phosphate deposits of Morocco and decided to give it a dip in water to see what would happen. What surprised me is how quickly the pieces crumbled into tiny clumps. Practically 80% of the matrix was gone in less than 10 seconds, dissolved by the water. I could very well have picked up a piece from dried mud and it would give similar results. I always thought the Moroccan stuff was a kind of sandstone, but what I saw suggests it is more of a clay-type rock? Then again, can the matrix even be considered a rock given how "fragile" it is? Would love to hear your thoughts! Jay
  23. I went to visit my family south of Rochester, NY a couple of weeks ago. They own property which includes a creek emptying into Canandaigua Lake. Here are some pics and finds. There are public sites very close with similar fauna, including Green's Landing, and Barnes' Gully/Onanda Park. Eldredgeops Rana strophomenid Amboecoelia umbonata strophemenid brachiopod (not concava--its a flat one)
  24. Canandaigua death assemblage

    From the album Canandaigua trilobites

    Lots of trilobite parts, a few mediospirifer sp's. Very busy. Fragile mudstone, difficult to split or remove matrix without destroying specimens.
  25. Miocene marine insect?

    Is this an insect? Marine spider?