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Showing results for tags 'spicules'.
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I have read that finding spicules preserved in sponge is quite rare. I am finding sponge fossils with what I believe are spicules, but the fossils seem to be all calcium carbonate, no silica. this seems to me to show the original sponge body was aragonite or calcite based. This was found on the north eastern side of the tip of the Mitt in Michigan The area is considered Middle Devonian, but these were found on the shore of Lake Huron, so there is also the possibility that they are glacial transports. Comments welcome.
I have found several of these and have gone back to harvest more for the sweet crystalspot. The area also has cylindrical Stromatoporoid and favosite fossils. I also found two of these specimens with large (rare to me) bivalve or brachiopod species in the matrix. The base of which looks like a "C." The critters are in a certain strata of the limestone road cut. They are quite distinct in appearance within the wall, due to the long, radiating spicules (I think that's what I'm seeing) and the darker color. Of course, some actually appear with their crystal structures exposed. Thanks in advance for help with the ID.