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Two Texas DFW Cretaceous Nautilus


NWARockhound

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20201229_161752.thumb.jpg.f1d38e35e9f3aa10c7fce818b3dd6ed1.jpg

When I was visiting my parents for Christmas, there was a surprise for me in my favorite local creek bed, and it wasn't just how cold the water was!  I've found plenty of ammos there, but these are my first two nautilus.  I tried to find out what they are, but I pretty much got redirected to ammo IDs.  I was also wondering if it's worth buying the HGMS ID books.  I'm curious, but don't really want to spend the money.  These were found in a marl layer, but I'm not really sure which one.  Grayson Marl I believe.  Found in Tarrant County.  Are they cymatoceras?  Cracked one is about 2" diameter, other about 1.5".

20201229_161757.jpg

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I'd like to see photos looking down at the aperture.

 

I have the Texas Cretaceous Ammonites and Nautiloids in paperback from the time I spent in Texas and have found it to be very informative and useful. It's a 10$ PDF download on the HGMS site now and 20$ for paperback so it isn't much of an investment. I'd recommend it.

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I can think of some Georgia creeks that have lots of ammos too.  .22's, .30-06's, .338s, shotgun shell casings, you name it.

 

I agree with Thomas.Dodson that we need some more views including the aperture.

 

Don

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1 hour ago, Hipockets said:

Could it be Eutrephoceras sp. ?

That was my first thought when I saw them.

Bulldozers and dirt Bulldozers and dirt
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Them red clay piles are heaven on earth
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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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Very nice. Cymatoceras is correct. Eutrephoceras are found in upper cretaceous deposits and Paracymatoceras have deeper suture folds. Not much else in Texas for nautiloids.

 

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Oohh! That is a nice one! :) 

    Tim    VETERAN SHALE SPLITTER

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Here are the apertures.  First photo with is the larger cracked fossil, second is the smaller one.  Thanks everyone!

 

20201229_154053.jpg

20201229_200530.jpg

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2 hours ago, FossilDAWG said:

I can think of some Georgia creeks that have lots of ammos too.  .22's, .30-06's, .338s, shotgun shell casings, you name it.

 

I agree with Thomas.Dodson that we need some more views including the aperture.

 

Don

Good to know some things are universal! :BigSmile: The first place I ever went fossil hunting was a popular local spot to blow things up with shotguns

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17 minutes ago, NWARockhound said:

Here are the apertures.  First photo with is the larger cracked fossil, second is the smaller one.  Thanks everyone!

 

20201229_154053.jpg

20201229_200530.jpg

 

 

Thanks for the whorl profile views. This confirms Cymatoceras. Eutrephoceras has an aperture that is wider than it is high and a shallow sinus at the venter.

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