Fragment of the back piece (squamosal) of the skull from a baleen whale (Mysticeti)?
This is hard to picture, since it is just a fragment of a skull piece.
Side View
Top View
The grooved section is where the bulla (ear bone) attatches to the skull
Back Left View
The concave crevice is probably part of the brain case.
Sterioscopic View
Cross your eyes, align the images into one, and focus. You should see a 3-d version of the flat picture.

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