Skull piece?

[J.D.]

Any ideas what type of bone piece this is?  I am inclined to say it is a skull piece from a whale.  It is heavy - seems too heavy to be a vert fragment.  Found it in the Potomac near Stratford Hall and the Horsehead Cliffs.  (VA/MD)

Edited April 18, 2022 by J.D.
Spelling error

[J.D.]

Here are some more pics.