Click on images to enlarge, found in Benton county, Arkansas, Boone limestone formation
I found this specimen inside some soft limestone that is almost like sandstone in its consistency. The rock is quite porous and soaks up a lot of water.
The specimen is about 1/4" in size. It has a maze of tiny structures resembling arms. My microscope cam magnified them nicely.
Here's a shot from straight overhead.
Closeup of the holdfast.
Any ideas, anyone?
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