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Showing results for tags 'cretodus crassidens'.
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A Couple of Shark Teeth. Cretodus houghtonorum and Turonian Galeorhinus?
Mikrogeophagus posted a topic in Fossil ID
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!- 9 replies
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- atco
- carchariniformes
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Cretaceous shark teeth I found in Grayson County, TX
Fatigued_Fossil_Hunter posted a topic in Fossil ID
Eagle Ford Group, Post Oak Creek, Sherman, TX, USA I'm curious to know the identity of these shark teeth so help from experienced fossil hunters would be much appreciated!- 2 replies
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- cretodus crassidens
- cretolamna appendiculata
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From the album: Post Oak Creek
Extreme posterior from a large genus. Note the striations at the foot of the crown, and no nutrient groove.-
- cretodus
- cretodus crassidens
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From the album: Post Oak Creek
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- cretaceous
- cretodus
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From the album: Sharks
Cretodus crassidens Eagle Ford Group, Sherman, TX A smaller tooth from one of the largest predatory sharks in the Late Cretaceous (~ 90 Ma). It likely filled a similar niche in its environment that the Great White Shark does today. Its teeth are characterized by pointed side cusps, rounded root lobes, no nutrient groove, a shelf-like lingual root protuberance on anterior teeth, and striations (ridges) at the foot of the crown (on both the main cusp and side cusps). This tooth is as nice as they get in terms of preservation and completeness from this locale - this one is only missing the tip.-
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- cretodus
- cretodus crassidens
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From the album: Post Oak Creek
Tooth from a large Cretaceous shark. Scale bar = 1 cm. Collected 7/30/19.-
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- cretodus
- cretodus crassidens
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A few weeks ago I was working an exposure of the middle Turonian Kamp Ranch member of the Arcadia Park Formation in North Texas, using a chisel and the natural bedding planes to pull up slabs. I had been there less than 15 minutes and had only found one small, broken tooth amongst shell hash when I found this almost perfect medium sized Cretodus crassidens. I also found some smaller shark teeth including Ptychodus sp., miscellaneous vertebrate material, and ammonites of possibly multiple species. So far this specimen is my largest from the site The first thing I noticed about it was the white color of most of the enamel and strange patterns covering the exposed tooth. It looked like it had been recently exposed and weathered, but since it was only exposed by me pulling up slabs that is not possible. All the other teeth I found there didn’t have this type of preservation but had the normal brown enamel. I have searched for pictures of any other teeth with patterns like this, but so far nothing. I prepared it out of the rock and can see that the patterns occur on both the front and back of the blade and root. It is 35 mm diagonal and 25 mm root width. It was resting just a few millimeters above a large inoceramid shell. The tooth is perfect except that the tip of the left cusp broke off before fossilization. There are certain areas where the blade isn’t white and there are no patterns, but for the most part the pattern covers the tooth. I was also able to rub off a bit of the white with my finger, but it seems that the patterns are embedded in the tooth itself since it is also on the root. Here are some pictures. I am hoping the origin of these patterns can be explained and any links and/or pictures of other teeth like this can be provided. The first three are before prep and the rest are after. Thanks in advance! FIG 1. FIG 2.
- 11 replies
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- arcadia park formation
- cretodus crassidens
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