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Found 7 results

  1. From the album: Middle eocene fossils from Qatar

    This one is from the Midra shale formation of Qatar, and exhibits some really rare coloration not usually seen from this formation (Usually comes in shades of white). The slant length(longest side) is about 4 mm. (0.15 inches). Age: Middle Eocene
  2. Hey everyone, Just a quick ID post for help in pinning down what exactly these couple of teeth are. Up first is a broken crown to a tooth I found while processing South Bosque material from Central TX for a pet project of mine. It's Turonian in age and looks similar to some small Carchariniformes teeth I've found at the Whiskey Bridge. Note that when I found this tooth, I had not yet visited the Whiskey Bridge, so I am certain this is not a product of cross contamination. Anyways, it's unlike the other specimens I have from the South Bosque and I am struggling to find a genus that matches its shape other than Galeorhinus. Carchariniformes were present in the Mesozoic and Galeorhinus is known all the way back into the Cenomanian, but ones this old are very rare so I am hesitant. I am wondering if any knows another more likely genus for this Turonian tooth? The second tooth is definitely Cretodus, but I am trying to pin down a species. It came from the Atco (Coniacian) which is known to produce Cretodus crassidens, but I have recently learned of another species, Cretodus houghtonorum, that is also in the area and a candidate. Unfortunately, I do not have access to the paper describing C. houghtonorum so it is difficult for me to figure out how to differentiate the two, but just off of secondhand knowledge I believe this one may be C. houghtonorum because of its more gracile non-ovular cusp. The wrinkling on the labial face is very pronounced and travels farther up the cusp than on my C. semiplicatus specimen from the Cenomanian. On the lingual side, the wrinkling is very short whereas they travel much farther on the C. semiplicatus. The root on the suspected C. houghtonorum is extremely pronounced and almost hangs over the cusp and cusplets. Wish I had a C. crassidens to compare to, but the C. semiplicatus is all I've got for now. Luckily they are very similar in mouth position so it's easy to spot differences. Left is tooth in question; Right is C. semiplicatus specimen Tooth in question C. semiplicatus @ThePhysicist @Al Dente @MarcoSr If you know any other shark experts who could help, feel free to ping them in the replies Thanks!
  3. jikohr

    Micro Stone City shark teeth

    Hi everyone, I'm trying to id some very small shark teeth for an independent research paper I'm writing and am a little unsure on my ids. I took some photos of some typical specimens and was hoping to get some feedback. The scale bar is mm. I put what I think the species is with each group of photos. Any feedback and tips for differentiating these species would be greatly appreciated.
  4. sharkdoctor

    Hemipristis puzzle

    Any thoughts appreciated on the following. I've been working with some material from the Old Church Formation, including previously undescribed sites. The following tooth is from that work. It has most of the characteristics of an early Hemipristis curvatus (Or Hemipristis serra, if you follow Muller). Muller reports two possible teeth that are close to this shape from the Old Church: early Hemipristis serra and Galeorhinus aff galeus. What follows are three photos. 1) The tooth I found and am hoping to identify, 2) a Hemipristis serra from Muller, 1999 and 3) a Galeorhinus aff galeus from Muller, 1999. I lean strongly towards H. serra, but the tooth lacks serrations on the mesial edge. This makes me think that it may be a very early transitional or that there are some positional distinctions that I've not picked up on. The root and distal edge are much more consistent with H. serra. 1) The tooth I found and am hoping to identify (scale box=5mm): 2) a Hemipristis serra from Muller, 1999 3) a Galeorhinus aff galeus from Muller, 1999 (teeth labelled 1a, 2 and 1b) Full citation for photos 2 and 3: Müller, A. (1999). Ichthyofaunen aus dem atlantischen Tertiär der USA. Institut für Geophysik und Geologie. @Gizmo
  5. FossilsAnonymous

    Oligocene Galeorhinids

    Hey all, If anyone has any Oligocene Galeorhinids may you please post a picture? Also is there any record of them in the calvert formation of md? I know that’s Miocene but just a question. Thanks, FA
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