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Here is a tooth I have had for several years, not really knowing how to label.

Found in Ernst East Quarry, Bakersfield, California ( mid. Miocene, approx. 15mya)

I have read some topics on Physogaleus contortus symphseal mistaken for the Megachasma teeth, but this one doesn't seem to fall into that category.

As you can see it has a huge root compared to the crown, zero serrations and in fact doesn't even have what you may call a "cutting blade" at all ( crown is oblong).

20mm from base of root to tip of crown. Crown is 8mm wide, 13mm long.

I would like to finally label thus guy and am seeking your expertise on the matter.

Thank you in advance for any enlightenment you may offer.

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@MarcoSr @Al Dente @siteseer

 

 

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I think I found one similar, albeit smaller in some micro matrix from the Temblor fm there in Bakersfield. I'll have to check when I get home.

Accomplishing the impossible means only that the boss will add it to your regular duties.

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6 minutes ago, -AnThOnY- said:

Upper cow shark? (disclaimer, I don't know my sharks very well :)

They are the ones swimming around going, "Moooo.....moooooo....". (Never try to milk one without protective gear). :P

 

(And yes, Hexanchus is, of course, one of the genera of the ancient family of cow sharks aka sixgill or sevengill sharks so we may both be on the right scent here).

 

 

Cheers.

 

-Ken

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4 minutes ago, Manticocerasman said:

I would rather think Notorynchus cepedianus ( upper frontal tooth )

 

https://shark-references.com/post/710

 

Not from Sharktooth hill.

Agree with Digit. Hexanchus sp.

I have a couple of these teeth and that is what the forum members id them as.

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36 minutes ago, digit said:

Have you considered an upper symphyseal tooth from Hexanchus andersoni? Do some image searches for "hexanchus teeth" and you will see some that resemble your tooth:

 

https://sites.google.com/site/kyivzub/hexanchiformes

 

Just my $0.02.

 

 

Cheers.

 

-Ken

I agree 100%. Great call Ken. Great find Doren.

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image.png.0c956e87cee523facebb6947cb34e842.png May 2016  MOTM.png.61350469b02f439fd4d5d77c2c69da85.png.a47e14d65deb3f8b242019b3a81d8160.png.b42a25e3438348310ba19ce6852f50c1.png May 2012 IPFOTM5.png.fb4f2a268e315c58c5980ed865b39e1f.png.1721b8912c45105152ac70b0ae8303c3.png.2b6263683ee32421d97e7fa481bd418a.pngAug 2013, May 2016, Apr 2020 VFOTM.png.f1b09c78bf88298b009b0da14ef44cf0.png.af5065d0585e85f4accd8b291bf0cc2e.png.72a83362710033c9bdc8510be7454b66.png.9171036128e7f95de57b6a0f03c491da.png Oct 2022

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Agreed that the tooth does seem to resemble the related Notorhynchus but I was assuming Hexanchus based on Jim Bourdon's Elasmo.com website which has a faunal list for Sharktooth Hill. While this site is admittedly a bit out of date at times, it considers Notorhynchus to not be present at STH.

 

The only upper Hexanchus from STH was a similar symphyseal which I donated (with nearly all of my STH collection) to the FLMNH when I realized that they only had a few large teeth (all Carcharodon hastalis) from this locality that were donated back in 1966. I had the material needed to fill that vacuum and I wanted them to have some comparative material like Heterodontus since I've recently found this genus in Cookiecutter Creek in Florida (a previously unrecorded genus in the Florida fossil record). :)

 

 

Cheers.

 

-Ken

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8mm wide, 13mm long is bigger than the Notorychus upper symphyseals I have from lee Creek. That is why I am agreeing with Ken on it being Hexanchus. Also, as Ken and Tony stated, Notorynchus is not part of the Sharktooh Hill assemblage. 

Bulldozers and dirt Bulldozers and dirt
behind the trailer, my desert
Them red clay piles are heaven on earth
I get my rocks off, bulldozers and dirt

Patterson Hood; Drive-By Truckers

 

image.png.0c956e87cee523facebb6947cb34e842.png May 2016  MOTM.png.61350469b02f439fd4d5d77c2c69da85.png.a47e14d65deb3f8b242019b3a81d8160.png.b42a25e3438348310ba19ce6852f50c1.png May 2012 IPFOTM5.png.fb4f2a268e315c58c5980ed865b39e1f.png.1721b8912c45105152ac70b0ae8303c3.png.2b6263683ee32421d97e7fa481bd418a.pngAug 2013, May 2016, Apr 2020 VFOTM.png.f1b09c78bf88298b009b0da14ef44cf0.png.af5065d0585e85f4accd8b291bf0cc2e.png.72a83362710033c9bdc8510be7454b66.png.9171036128e7f95de57b6a0f03c491da.png Oct 2022

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I definitely agree with Hexanchus, especially after reading some of the reasoning in some of the comments. Digit hit that one right on the nail.

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I agree with an upper tooth EDIT: (probably a parasymphyseal tooth) from Hexanchus andersoni.  Below are extant dentitions of Hexanchus griseus and Hexanchus nakamurai from J-elasmo for comparison.

 

Hexanchus griseus:

 

5bee203a9d29d_HexanchugriseusKagurazameBluntnosesixgillshark.thumb.jpg.60dbdbd102431d352d88b6430e9d80b9.jpg

 

Hexanchus nakamurai:

 

5bee203c1ec83_HexanchusnakamuraiSirokagurazameBigeyesixgillshark.thumb.jpg.3457f30d6b3369b3bc73d6fc8d3c5d73.jpg

 

 

Marco Sr.

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