Bioturbation // burrows in the Jan Juc Marl. A marl is a calcium rich mud and the Jan Juc Marl is early Ogliocene - early Miocene in age and is defined as a fine-grained silty glauconitic marl with sandy calcarenite interbeds which coarsens upwards.
My learned friend, Shannon Hurley, suggests these overlapping and diverging burrows are Chondrites. She proposed that the circular burrow (cross-section) pictured below my finger is Thalassinoides.
Ophiomorpha?
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