raindaddy Posted June 21, 2017 Share Posted June 21, 2017 I walked upon a shale bed covered with these along other things I have not trained my eyes for. Link to comment Share on other sites More sharing options...
Darktooth Posted June 21, 2017 Share Posted June 21, 2017 Nice finds! Congratulations! I like Trilo-butts and I cannot lie. Link to comment Share on other sites More sharing options...
Kane Posted June 21, 2017 Share Posted June 21, 2017 Nice find. If you would like an identification of the species, could you provide a photo of the keel (edge view)? Perhaps one of our ammonite experts from San Antonio can weigh in (@Uncle Siphuncle ?). ...How to Philosophize with a Hammer Link to comment Share on other sites More sharing options...
gavialboy Posted June 21, 2017 Share Posted June 21, 2017 Wow nice ammonite. That's pretty cool. They are on my bucket list of fossils to find Link to comment Share on other sites More sharing options...
Uncle Siphuncle Posted June 21, 2017 Share Posted June 21, 2017 First step is to ascertain geologic formation. If these are San Antonio finds, my first guess based on general features of the specimens and amount of exposure would be Austin Chalk, but we also have Lower Cretaceous ammos pop up in the more sporadically exposed Georgetown formation. I don't have my references in front of me, but the row of umbilical nodes on each rib is the first diagnostic feature that jumps out at me. Have a look at this zoomable geomap and let us know what formation you were hunting (no need to disclose your site specifics publicly). From that point we can try to narrow it down to a genus. https://www.twdb.texas.gov/groundwater/aquifer/GAT/san-antonio.htm Grüße, Daniel A. Wöhr aus Südtexas "To the motivated go the spoils." Link to comment Share on other sites More sharing options...
Miocene_Mason Posted June 21, 2017 Share Posted June 21, 2017 Nice specimen! “...whilst this planet has gone cycling on according to the fixed law of gravity, from so simple a beginning endless forms most beautiful and most wonderful have been and are being evolved.” ~ Charles Darwin Happy hunting, Mason Link to comment Share on other sites More sharing options...
BobWill Posted June 21, 2017 Share Posted June 21, 2017 Thanks for posting these and welcome to the forum from a North Texan. At first I thought the one still attached to the rock was the impression where the lower one came out of the matrix but from the shadows it looks convex like the other one. They don't look like the same kind of ammonite unless there is a lot of wear because the tubercles (row of bumps) on the umbilical margin that Dan mentioned do not appear on the top one. If he doesn't recognize it I won't attempt an ID but it might help to send us another photo showing the profile like Kane suggested. That would be looking from the direction of the red arrow in this cropped image. That would tell us the shape of the whorl which can be diagnostic. That might help with the top ammonite too. Photograph the side covered up by your right hand from the edge. Link to comment Share on other sites More sharing options...
JohnBrewer Posted June 21, 2017 Share Posted June 21, 2017 Welcome to the forum nice ammo! John Map of UK fossil sites Link to comment Share on other sites More sharing options...
Uncle Siphuncle Posted June 21, 2017 Share Posted June 21, 2017 Many moons ago, I wrote up something to help people decipher the formations around San Antonio. See below. Grüße, Daniel A. Wöhr aus Südtexas "To the motivated go the spoils." Link to comment Share on other sites More sharing options...
Plax Posted June 22, 2017 Share Posted June 22, 2017 Just out of curiosity where was San Antonio listed as the source area for the fossil in this string? Looked this over several times. I have noticed that when folks list their location as "US" the pin on their home page shows the middle of the country. Perhaps "Texas" shows up near San Antonio? Wouldn't be the first time I missed a detail! Link to comment Share on other sites More sharing options...
ynot Posted June 22, 2017 Share Posted June 22, 2017 3 minutes ago, Plax said: where was San Antonio listed as the source area for the fossil in this string? In the tags. 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...
Plax Posted June 26, 2017 Share Posted June 26, 2017 I could swear I looked there and didn't see it earlier?? Old brain.... Link to comment Share on other sites More sharing options...
raindaddy Posted June 27, 2017 Author Share Posted June 27, 2017 I looked on the Geomap, as there are tons of ammomnites laying in the shale visible!!!! Kdu seems to be where @BobWill also near the site was this fossil. still cant figure this one. Link to comment Share on other sites More sharing options...
raindaddy Posted June 27, 2017 Author Share Posted June 27, 2017 kau Link to comment Share on other sites More sharing options...
raindaddy Posted June 27, 2017 Author Share Posted June 27, 2017 On 6/21/2017 at 8:27 AM, Uncle Siphuncle said: First step is to ascertain geologic formation. If these are San Antonio finds, my first guess based on general features of the specimens and amount of exposure would be Austin Chalk, but we also have Lower Cretaceous ammos pop up in the more sporadically exposed Georgetown formation. I don't have my references in front of me, but the row of umbilical nodes on each rib is the first diagnostic feature that jumps out at me. Have a look at this zoomable geomap and let us know what formation you were hunting (no need to disclose your site specifics publicly). From that point we can try to narrow it down to a genus. https://www.twdb.texas.gov/groundwater/aquifer/GAT/san-antonio.htm Link to comment Share on other sites More sharing options...
abyssunder Posted June 28, 2017 Share Posted June 28, 2017 This looks to be "Silex", as we used as term here in Europe. second picture from here " We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. " Thomas Mann My Library Link to comment Share on other sites More sharing options...
raindaddy Posted June 28, 2017 Author Share Posted June 28, 2017 i near Mcallister Park, in a ditch, or runoff, behind some neiborhoods. there are at least 3 more that i know exposed to the surface area. Link to comment Share on other sites More sharing options...
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