murseboog Posted December 21, 2017 Share Posted December 21, 2017 Need some help identifying some shark teeth I acquired. The first two images, the only thing i know about this one is that they were found in Bone Valley This second two images are of a tooth found in an Eocene layer at the Brazos River in Texas brazosfossilfront brazosfossilback The last two images I know nothing about. It just came in a collection I acquired UnknownfrontUnknownback Any help would be greatly appreciated. Thanks so much. Link to comment Share on other sites More sharing options...
Paleoc Posted December 21, 2017 Share Posted December 21, 2017 The first tooth is Carcharias taurus (not extinct Sand Tiger) The last tooth is a posterior Cretalamna, there are different species depending on age. The dark tooth is too small and dark of an image to id. Link to comment Share on other sites More sharing options...
Macrophyseter Posted January 1, 2018 Share Posted January 1, 2018 I agree that the first tooth is from a Carcharias, and an anterior one too. I think that the second tooth could possibly be a posterior and/or baby Cretolamna appendiculata? The last tooth may be a posterior Cretolamna appendiculata, I believe. As far as I know, Cretolamna appendiculata teeth are almost the only species found in the US. Other species like C. biauriculata have been found here, but are much rarer and mostly can be distinguishable by their double cusps contrary to appendiculata's thick single cusps. The place that I find to have an extremely diverse community of most Cretolamna species would rather be Morocco. If you're a fossil nut from Palos Verdes, San Pedro, Redondo Beach, or Torrance, feel free to shoot me a PM! Link to comment Share on other sites More sharing options...
MeargleSchmeargl Posted January 1, 2018 Share Posted January 1, 2018 Sand Tiger first. Second would need better pic Third also looks like Cretolamna. Every single fossil you see is a miracle set in stone, and should be treated as such. Link to comment Share on other sites More sharing options...
Cam28 Posted January 3, 2018 Share Posted January 3, 2018 On 12/31/2017 at 9:17 PM, Macrophyseter said: I agree that the first tooth is from a Carcharias taurus, the modern sand tiger shark, and an anterior one too. I think that the second tooth could possibly be a posterior and/or baby Cretolamna appendiculata? The last tooth may be a posterior Cretolamna appendiculata, I believe. As far as I know, Cretolamna appendiculata teeth are almost the only species found in the US. Other species like C. biauriculata have been found here, but are much rarer and mostly can be distinguishable by their double cusps contrary to appendiculata's thick single cusps. The place that I find to have an extremely diverse community of most Cretolamna species would rather be Morocco. I thought in miocene it was Carcharias cuspidata, did it recently change? Link to comment Share on other sites More sharing options...
Macrophyseter Posted January 3, 2018 Share Posted January 3, 2018 Just now, Cam28 said: I thought in miocene it was Carcharias cuspidata, did it recently change? Wait, you are actually right. Sorry if I confused you for a while If you're a fossil nut from Palos Verdes, San Pedro, Redondo Beach, or Torrance, feel free to shoot me a PM! Link to comment Share on other sites More sharing options...
Al Dente Posted January 3, 2018 Share Posted January 3, 2018 10 hours ago, Cam28 said: I thought in miocene it was Carcharias cuspidata, did it recently change? Are you sure it is from the Miocene? I think Pliocene is found there too. C. taurus will usually have lingual striations and C. cuspidata are usually smooth. Link to comment Share on other sites More sharing options...
Cam28 Posted January 3, 2018 Share Posted January 3, 2018 Hmm interesting I'll have to research more. I have special edition shark tooth papers from Gainesville that list local mio/plio sand tigers as "Carcharias cf. cuspidata" & other sources seem to state it as miocene but I'm not anywhere close to being a sand tiger expert lol Link to comment Share on other sites More sharing options...
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