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Showing results for tags 'demosponge'.
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Here is the fossil that was named after me back in 1999. Why did I wait so long to sign up on this site. I am not that good at establishing passwords. After numerous attempts, I am now signed up. Below is a recent photo of Chaunactis olsoni. I , Tom Olson , am the original discoverer of this sponge from the Pennsylvanian Naco Formation of Central Arizona.
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- keith rigby (author)
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Hello, I'd appreciate your help with this one. I found this one at a Lake Michigan beach in Illinois. Silurian from the Racine formation. I believe it's a sponge or demosponge. Thinking the white dots on the vertical growth are pores, and the admittedly terrible microscopic photo of a small area on top of the rock shows some of its openings. Some of these seem to be filled with minerals that make them look like bumps, many others aren't preserved well at all, just show as faded round dots. Am I way off on this? TIA, Pippa
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