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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.