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When you have a lot of fossil friends, you get involved in fossil stuff, which is a joy. So, I have a friend who found in 2004, a Baleen Whale Jaw 20-25 feet below current land in a lake bed for housing development. Sounds like Miocene to me. I love Whale. He knows that and offered to sell me the jaw. It is out of my price range for fossil acquisitions. I told him that I would try to get the jaw identified or at least get some options. The jaw seems complete and is a tad over 6 feet in length. He and friends performed a LOT of work to retrieve it from the muck with as few breaks as possible, stabilize the pieces, mount it for display. There is value for me just to have the photos. So, I will tell you that in the Plaster Jacket Newsletter, Sept 1978 , Gary Morgan for the Florida Paleontology Society, stated ".. a nearly complete mandible of Baleanoptera floridana, more than 6 feet in length was found near Pierce, in Polk County, Florida..." and if this fossil is from an adult, it is not the equivalent of Blue, Grey, Fin, or Sei whales today. A 6 foot mandible is relatively small for a Baleen Whale. I guess it could be a juvenile. B. Floridana has been merged into B. Cortesii . That is as much as I know/guess and hoping a whale expert can add something to the identification. @siteseer @Boesse