This is the "Fossil Friday" post #170. Expect this to be a somewhat regular feature of the website. We will post any fossil pictures you send in to [email protected]. Please include a short description or story. Check the #FossilFriday Twitter hash tag for contributions from around the world!
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Today, we have a very sweet little snail from the quarry in Belvedere, IL. The rocks in that area date to the Ordovican Period, which spanned from about 490 to 443 million years ago, This particular fossil is an example of a snail of the genus Trochonema. Since the fossil is an internal mold, we can't see the external ornamentation, and therefore, species determination is difficult. There are two possible species known from that area, T. beloitense and T. umbilicata.
This contribution comes from ESCONI member Anthony Friend, who collected it last spring. Thanks for sharing, Anthony! It turned out great!
I found it in the Belvedere area quarry on the ESCONI trip last spring. I had to break it to get it out of the negative side embedded in a large boulder, but it glued back together nicely.
