Since you all had such interesting and useful information on my non-shark tooth (darn it!) from yesterday, I thought I would throw this out to you to learn about it. My kids and I found this partial buffalo skull in the mud along a river bank here in Iowa. I love it SO much - such a great conversation piece! I would like to do a write up with some facts on it to place by the skull, but my expertise stops at anything past being one who gets excited about rocks and fossils! I was told that one way to determine age is to place a string between the tips of the horns, and to see how far off of the skull bump the string lies. When I do this, the string is on the skull bump. I do not know if there is any truth to this, or what it even means, but thought I would provide you with that visual if you need it. Please let me know if I can give you any further information or photos to help you in your assessment. Thank you everyone!