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Mazon creek shell, not from a nodule


TheRocksWillShoutHisGlory

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I introduced a coworker to pit 11 on Sunday.  He was picking up all kinds of rocks, some of which I was pretty sure were not caeboniferous, but I didn't want to break his enthusiasm.  Now, he dropped off his bucket at my class because I have a freezer, and in the rocks that i was sure were from the wrong Era was this nice shell!  Can anyone identify it?

20220310_084649.jpg

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Some kind of gastropod :Confused05: There are a lot of Silurian dolomites in Pit 11, some glacial erratics, some brought in for construction. I would wager that is what this is.

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