This is an interesting animal that many are not even aware exists in the Mazon Creek deposit.
It is a fossil gooseneck barnacle named Illilepas damrowi.
Barnacles are known from as early as the Cambrian but are relatively rare in the fossil record.
A barnacle is actually a crustacean and are distantly related to lobsters. Modern gooseneck barnacles also have a similar taste to lobster.
Like all gooseneck barnacles, Illilepas has a stalk like body and a calcareous head region consisting of plates called a scotum and Tergum.
In life, the animals appendages would extend out and filter the water for nutrients.
Barnacles will permanently cement themselves to a solid surface.
Illilepas is quite rare and only found in the Essex (marine) portion of the Mazon Creek deposit.
This first specimen is a fantastic grouping of several individuals still attached to a bivalve (Myalinella meeki).