This is a medium sized Mioplosus from the Green River formation in Wyoming that is not as well preserved as some but still is showing scale details with the bony head being the best preserved and has a closed jaw. They were solitary hunters with larger specimens showing needle like teeth and some with a fish lodged in their mouth at death known as an aspiration. They are distinguished by their double dorsal fins and fan like tail. This area was part of the. Now famous Fossil Lake during the Eocene period and is from the split fish or 12” layers that have more of a brown/red color. This specimen is approximately 8” long on a nice piece of matrix that is approximately 10”x 6” and is 1” thick. This fish has fresh water relatives in the present day Northern Hemisphere, Asia, Europe and New Zealand.
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