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Showing results for tags 'spicules'.
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Some unidentified spicules from the middle Silurian Racine formation. All specimens measure approximately 250 - 500um.
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Hindia spheroidalis (sponge), Schoharie New York - what age/formation?
Wrangellian posted a topic in Fossil ID
@Scylla was nice enough to send me these two Hindia specimens from the PCS Quarry in Schoharie NY. But we're not clear of the geology. Apparently more than one formation is exposed there. Does anyone know if the formation/age can be narrowed down at all, based on the taxon and location? Also, is the granular texture (esp. the one on the right) indicative of spicules? The one on the left has a depression, as if it were a spherical vase shape with an opening at the top. Is this what Hindia would have looked like in life? The other one has no clear depression, and I wonder why.- 5 replies
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- devonian
- pcs quarry
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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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These things are very small and difficult to find but I came across a stone that was littered with hundreds of forams and these spicules. I don't recall seeing anything that look like a sponge so I'm very curious as to why there were so many of these spicules being found in this stone that was found in a desert.
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- marine
- microfossils
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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.
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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.
- 9 replies
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- dogs tooth calcite
- honey calcite
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