Thank you Paul ,,,, most helpful . Mark (ferret) ----- Original Message ----- From: "Monfils, Paul" <[log in to unmask]> To: <[log in to unmask]> Sent: Friday, January 26, 2001 10:59 AM Subject: Re: Help in Identifing a fossil sharks tooth > Hi Mark, > There are a number of different types of shark teeth that have bilateral > cusps beside the main blade. But given the large size of your specimen, it > is probably an Otodus tooth, probably Otodus obliquus (a larger ancestor of > the modern day mackerel shark). > > Here are some site that may be helpful: > > http://nmnhwww.si.edu/paleo/sharkteeth/#anchor26517478 > http://www.megalodonteeth.com/ > http://www.naturepreserved.com/megalodon/fossil%20shark%20teeth.htm > > Regards, > Paul M. >