First of all - sorry for bad and rude language)) So, I need some help with identification of this teeth. All was found in Russia, Trans-Urals region, in a few different rivers: Belyakova, Sugatka and Derney. There must be Eocene period, probably lutet or barton layer, but I can't be sure, because there is no bedrock, only fossils that river stream brings. Sometimes me and other people found there more old fossils, back to cretaceous even. I showed this photo to few reptile specialists from Saint Petersburg, but they sure that is no crocodile teeth, and insist that is a fish teeth. But i have fish teeth from this region, and they looks different. There we can found Palaeocybium, Scomberomorus, Eutrichiurides and even Sphyraenodus species teeth, and all they looks like different to this teeth. So, what is it? Some new fish species, crocodile of some another reptile?