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Showing results for tags 'stromatoporoids'.
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Shamlama resurrected some old images for discussion on spicules and hexactinellids. Here are a couple of photos that might be of interest from devonian sponge ( stromatoporoids) fossils found in Presque Isle County, Michigan and Alpena County, Michigan.
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Hi, interested to hear some thoughts on this fossil found in Chicago. It was chiseled out of a large boulder containing Silurian reef material; rugose corals, gastropods, bryozoans, crinoids, etc... I'm guessing it is a form of stromapotoroids, but I'm not sure. Any ideas? Measures 2.5"