5.35" Fossil Capelin Fish (Mallotus) Nodule - Canada

This is a fossil Capelin fish of the species Mallotus villosus preserved inside of a concretion, collected from Ontario, Canada. These uniquely preserved fish have beautifully preserved bone structure and are found by cracking open the hard concretions. Both halves of the concretion are included. This is an old collection piece.

These nodules formed within the Pleistocene Leda Clay. This clay formed as a result of an inland sea known as the Champlain Sea. The weight of the glaciers resulted in the sinking of the earth's crust, which preceded to be filled in by the Atlantic Ocean following the recession of the glaciers. These waters were home to a variety of marine fauna, including the Capelin fish.