ok, we went to a local university today. The geology professor thought I needed another opinion on the rock. He said "it is the strangest chert nodule I have ever seen" "There is a 5% chance you are right about it being a fossilized head" "I do not know" "it does look like bone". "I do not understand how it could have formed" "That fine sheen on the top is very strange." "we do not know what makes silica concentrate into flint"
He also ran some tests, and interestingly, the "teeth" did not react to acid - while other white calcite on the stone did.
interesting. i have to imagine the odds of any bone fossilizing- times the odds of the asteroid strike- times the odds of it being uncovered and found by you make this an exxxxxtreme longshot.
on the other hand geofacts are plentiful and common and come in many very interesting shapes.
good luck. i think it is a very cool rock, and i would put it on the bar for topics of conversation.