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Found 7 results

  1. Hey everyone. Maybe someone could clear this is up for me. A. "When I look on a geologic map and see MzM (which means Mesozoic marine sedimentary rock.) Does that mean anything from Triassic to Cretaceous? If so how can I be sure when I find a fossil which date it is from? (other than the obvious of course which is to identify the species and find what date its from) B. I also see metasedimentary which is Precambrian and Silurian etc. Those rocks are "Meta" sedimentary which means they were sediments good for fossils but have been subjugated to high temperatures and pressures which Should destroy fossils. Do you think there are fossils in that metasedimentary rock or should I stick to just sedimentary. C. I found these fossils from the what I thought was the Eocene period on a hill (intermediate of hill and mountain) of a few clams and turritella inside a sedimentary rock. People who live in the nearby area talk about how millions of years ago the spot I collected at used to be a shallow prehistoric ocean. On the map it says tertiary (old word for Paleogene), which means 66 - 2.5 million years ago . When I use the website "(http://dinosaurpictures.org/ancient-earth#240)" It shows that the spot I collected from was and remained land until 90 million years ago when became a shallow ocean. which would be cretaceous. The fossils I collected were all marine and were far from the real ocean. How is it that I found marine fossils in Paleogene sediment which was not shallow ocean since 90 million years ago. I would imagine a river or stream but these fossils look very "Ocean like" (I do know that's not a valid way to determine a fossils origin) Anyways if anyone could help me out, that'd be great.
  2. Me again guys, I have a few fragments of a copper like color, smooth but porous on the inside specimens which i thought might me coprolites. It could also be geologic, smelting bog or something. But found well underground near the Testudines Sp. fragments posted on Saturday. Could you take a look and give me some ideas?
  3. Does anyone know where I can find on the web a chart or table that lists shark species versus geologic time? I have searched but just can't find one. It would also be helpful if the table would show lineage as is presently believed to be accurate. Thanks!
  4. I’ve stumbled across similar pieces of limestone throughout the years, but never have been able to figure out what they are. This piece of whatever it is is by far the largest and I honestly don’t have a clue as to what it is. This and similar finds only ever seem to have grooves or striations around the edges and nothing regular (at least to my perception) on the top or bottom which leads me to think they are probably of a geological origin, but I have never come across anything that matches these oddities... As stated in the tags I found this in a creek (near Auburn, Nebraska) which I know complicated things but other pieces of the same (or at least similar) material were from crushed up Oread limestone (Shawnee Group) from the Plattsmouth member which produces Carboniferous fossils. Any help would be appreciated! Curse the attachment size limit!
  5. ID Help

    I found these pieces a number of years ago. All from the same limited area. Never have found any since. No one that has seen them can offer an ID. Interested in member thoughts. Thanks
  6. Geologic or sea life

    I collected this in a canyon in the Black hills of Eastern Wyoming. I don't usually think of fossils in that region, but there happened to be a limestone column with some brachiopods about a half mile from where this rock was found, suggesting a marine environment for some of the rocks in the area. I can't tell which geologic strata I was in, as things change quickly in the Black Hills http://pubs.usgs.gov/sim/2777/downloads/2777_sheet1.pdf , and there is material washing down the canyons all the time. This was in a dry creek bed. approximately 20 cm across, 10 cm wide and 10 cm thick
  7. This little specimen is just 5 mm tall, and 8 mm at its widest. This comes from a chunk of matrix that I picked up in the chalk deposits in the area of Demopolis, Alabama. Having found an enchodus fish tooth in similar material, I'm making an effort to break up and look through this stuff a bit better before throwing it away. This particular tiny thing was left behind in after leaving some pieces overnight in a white vinegar bath. The chalk dissolved away, leaving this. Note the fibers scattered around it - those have come from the specimen. I'm 90% sure this is simply geologic, not fossil. Even so, I'm curious if anyone can point me to how this might have formed.
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