NWARockhound Posted December 29, 2020 Share Posted December 29, 2020 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". 2 Link to comment Share on other sites More sharing options...
Hipockets Posted December 29, 2020 Share Posted December 29, 2020 Could it be Eutrephoceras sp. ? Link to comment Share on other sites More sharing options...
Thomas.Dodson Posted December 29, 2020 Share Posted December 29, 2020 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. 3 Link to comment Share on other sites More sharing options...
FossilDAWG Posted December 29, 2020 Share Posted December 29, 2020 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 Link to comment Share on other sites More sharing options...
sixgill pete Posted December 29, 2020 Share Posted December 29, 2020 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 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 May 2016 May 2012 Aug 2013, May 2016, Apr 2020 Oct 2022 Link to comment Share on other sites More sharing options...
BobWill Posted December 30, 2020 Share Posted December 30, 2020 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. 5 Link to comment Share on other sites More sharing options...
Fossildude19 Posted December 30, 2020 Share Posted December 30, 2020 Oohh! That is a nice one! Tim - VETERAN SHALE SPLITTER VFOTM - APRIL - 2015 __________________________________________________ "In every walk with nature one receives far more than he seeks." John Muir ~ ~ ~ ~ ><))))( *> About Me Link to comment Share on other sites More sharing options...
NWARockhound Posted December 30, 2020 Author Share Posted December 30, 2020 Here are the apertures. First photo with is the larger cracked fossil, second is the smaller one. Thanks everyone! 1 Link to comment Share on other sites More sharing options...
NWARockhound Posted December 30, 2020 Author Share Posted December 30, 2020 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! The first place I ever went fossil hunting was a popular local spot to blow things up with shotguns Link to comment Share on other sites More sharing options...
BobWill Posted December 30, 2020 Share Posted December 30, 2020 17 minutes ago, NWARockhound said: Here are the apertures. First photo with is the larger cracked fossil, second is the smaller one. Thanks everyone! 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. 4 Link to comment Share on other sites More sharing options...
Thomas.Dodson Posted December 30, 2020 Share Posted December 30, 2020 Definitely Cymatoceras. Cymatoceras hilli would be my guess. 4 Link to comment Share on other sites More sharing options...
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