BobWill Posted August 22, 2014 Share Posted August 22, 2014 I found this ammonite in the Lower Cretaceous of north central Texas. It's from the Goodland Limestone Formation of west Denton County. Every third rib flares way out from the rest at the ventro-lateral margin. Not really like a typical tubercle, more flat like an ear. Most of these are broken off and they seem to disappear near the aperture where the ribs are the same size. There is a rounded ventral keel and without further cleaning, no sutures visible. 1 Link to comment Share on other sites More sharing options...
fossilized6s Posted August 22, 2014 Share Posted August 22, 2014 Wow, that is a strange ammo indeed. Cool find Bob. Hopefully someone can ID this guy for you. I wonder what the point would be for a Ammo to grow an especially longer growth ring erratically? Mating docking system? ~Charlie~ "There are those that look at things the way they are, and ask why.....i dream of things that never were, and ask why not?" ~RFK ->Get your Mosasaur print ->How to spot a fake Trilobite ->How to identify a CONCRETION from a DINOSAUR EGG Link to comment Share on other sites More sharing options...
rwise Posted August 22, 2014 Share Posted August 22, 2014 Neat find....only one I've seen like this.... Thanks for your help in advance. Link to comment Share on other sites More sharing options...
Uncle Siphuncle Posted August 22, 2014 Share Posted August 22, 2014 Compare with Dipoloceras cristatum...a cosmopolitan index fossil. 1 Grüße, Daniel A. Wöhr aus Südtexas "To the motivated go the spoils." Link to comment Share on other sites More sharing options...
JustPlainPetrified Posted August 22, 2014 Share Posted August 22, 2014 Cool find indeed. Link to comment Share on other sites More sharing options...
BobWill Posted August 23, 2014 Author Share Posted August 23, 2014 Thanks Dan. I noticed the genus in the "Treatise" when I saw those horns but the one in there had such sinuous ribs I ruled it out. Nothing in the "Index Fossils...". I should have looked up the Texas version of Dipoloceras in the Houston book but I think I looked there first and didn't see horns on the only species pictured there. Horns, they're called horns, not ears. ha ha Too bad most of them are broken off, that lowers the priority for doing the prep Link to comment Share on other sites More sharing options...
vertman Posted August 23, 2014 Share Posted August 23, 2014 Very nice. I have also never seen one of these before. Link to comment Share on other sites More sharing options...
Katfish61 Posted August 23, 2014 Share Posted August 23, 2014 Bob, what a nice find....... Kathy Link to comment Share on other sites More sharing options...
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