austinswamp Posted January 14, 2017 Share Posted January 14, 2017 This came from a gravel bed in Travis county with a large bluish shale formation nearby. Any info on the material of the rock would be appreciated as well. Thanks! Link to comment Share on other sites More sharing options...
ynot Posted January 14, 2017 Share Posted January 14, 2017 The rock looks like chert. Tony Darwin said: " Man sprang from monkeys." Will Rogers said: " Some of them didn't spring far enough." My Fossil collection - My Mineral collection My favorite thread on TFF. Link to comment Share on other sites More sharing options...
BobWill Posted January 14, 2017 Share Posted January 14, 2017 Almost certainly a mollusk but without more details it would be pretty hard to even say if it's a gastropod or a cephalopod. Probably an internal mold and not showing any sutures suggests one of the less common snails that coil in a stationary plane. However, sutures don't always preserve so it could be an ammonite and could even be an external cast. Look for similar fossils with more detail preserved or ask someone who is familiar with fossils from the specific area. 1 Link to comment Share on other sites More sharing options...
austinswamp Posted January 15, 2017 Author Share Posted January 15, 2017 4 hours ago, BobWill said: Almost certainly a mollusk but without more details it would be pretty hard to even say if it's a gastropod or a cephalopod. Probably an internal mold and not showing any sutures suggests one of the less common snails that coil in a stationary plane. However, sutures don't always preserve so it could be an ammonite and could even be an external cast. Look for similar fossils with more detail preserved or ask someone who is familiar with fossils from the specific area. It is starting to resemble Oncoceras Link to comment Share on other sites More sharing options...
BobWill Posted January 15, 2017 Share Posted January 15, 2017 I think Oncoceras is from the Ordovician and that area is mostly Cretaceous. Also they are not coiled but only slightly curved. 1 Link to comment Share on other sites More sharing options...
JohnJ Posted January 15, 2017 Share Posted January 15, 2017 I would agree with Bob that it is likely a gastropod internal mold...and just a partial one that could have had an elevated spire. I also think Tony is right that it is chert which means it didn't come from the blue shale. It is most likely the eroded remnant of the local Edwards Formation - which has plenty of gastropods and plenty of chert that often contains them. 1 The human mind has the ability to believe anything is true. - JJ Link to comment Share on other sites More sharing options...
Ludwigia Posted January 15, 2017 Share Posted January 15, 2017 Gastropod was also my first thought as soon as I saw this. Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
Bronto Posted May 29, 2017 Share Posted May 29, 2017 Looks like I can make out some suture in your fossil. I found a chert Ammonite yesterday. Link to comment Share on other sites More sharing options...
Ludwigia Posted May 29, 2017 Share Posted May 29, 2017 4 hours ago, Bronto said: Looks like I can make out some suture in your fossil. I found a chert Ammonite yesterday. Can you please point them out and maybe show us a photo of your chert ammonite. Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
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