I visited Chita peninsula, central Japan the day before yesterday and I collected some fossil samples from Miocene (17 Ma) sedimentary rocks. The yellowish part is the fossil of a sea urchin (Echinoderm) and the rock is siltstone. Sketched on the 25th of May, 2009.
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Thank you for posting the comment. Ah, I didn't realize the fossil looked like a human skull... it really looks like that. :D