Fossil Scratch Circle?
Collected at Okmulgee Lake Spillway in Oklahoma. It seems to be a scratch circle? The rings could have been formed over time by the organism swaying in a current. Very interesting. Found a paper on this here: earthscience.ucr.edu/docs/Soren_scratch_2002.pdf
The object is small, around 3.8 cm at its widest point. It is donut-like in shape with a central indentation and rounded outer ridge lined with concentric circles. There is a raised bump in the center of the indentation. The black areas are somewhat glossy while the places where the black layer has peeled off to reveal browns and yellows is matte. I didn't notice anything of interest on the bottom.
2017/03/19 - a suggestion from Justin Cowart: "orbiculoidea brachiopod deformed by folding"
Fossil Scratch Circle?
Collected at Okmulgee Lake Spillway in Oklahoma. It seems to be a scratch circle? The rings could have been formed over time by the organism swaying in a current. Very interesting. Found a paper on this here: earthscience.ucr.edu/docs/Soren_scratch_2002.pdf
The object is small, around 3.8 cm at its widest point. It is donut-like in shape with a central indentation and rounded outer ridge lined with concentric circles. There is a raised bump in the center of the indentation. The black areas are somewhat glossy while the places where the black layer has peeled off to reveal browns and yellows is matte. I didn't notice anything of interest on the bottom.
2017/03/19 - a suggestion from Justin Cowart: "orbiculoidea brachiopod deformed by folding"