Foshunter Posted October 22, 2013 Share Posted October 22, 2013 (edited) Found this in October while on vacation in Texas, from the Eagle Ford Formation in North Lamar Co. Searched the Texas Cretaceous Ammonite book and have two possible candidates, Acanthoceras which I am leaning to and Cunningtonceras. The photo prints in the book have lot to be desired so hoping a Texas ammonite expert can offer some info.--------Hey Dan W------come to the rescue----Tom Reshot pix in the sun light hopefully to show more detail Edited October 22, 2013 by Foshunter Grow Old Kicking And Screaming !!"Don't Tread On Me" Link to comment Share on other sites More sharing options...
JohnJ Posted October 22, 2013 Share Posted October 22, 2013 Tom, I would tend to agree with your Acanthoceras sp. ID, but the experts may disagree. The human mind has the ability to believe anything is true. - JJ Link to comment Share on other sites More sharing options...
Uncle Siphuncle Posted October 22, 2013 Share Posted October 22, 2013 while i don't claim to possess any more cenomanian/turonian ammonite acumen than anyone else, and i can't dig into my books at the moment, i was thinking that tx acanthoceras of that period had more of a continuous rib than yours, that sort of wraps more smoothly around the keel, without pronounced tubercles. that's my off the cuff comment, to be verified w literature. do you know the dfw area equivalent formation? this could help narrow things down. i plan to look up euomphaloceras and a few others. Grüße, Daniel A. Wöhr aus Südtexas "To the motivated go the spoils." Link to comment Share on other sites More sharing options...
PFOOLEY Posted October 22, 2013 Share Posted October 22, 2013 My first reaction Acanthoceras. I have some small ones from the Dakota SS (Cenomanian) that I shall look at tonight. Your ammonite also resembles some small Romaniceras (Turonian) that I have found. The Eagle Ford is Cenomanian and Turonian? "I am glad I shall never be young without wild country to be young in. Of what avail are forty freedoms without a blank spot on the map?" ~Aldo Leopold (1887-1948) New Mexico Museum of Natural History Bulletins Link to comment Share on other sites More sharing options...
Foshunter Posted October 22, 2013 Author Share Posted October 22, 2013 My first reaction Acanthoceras. I have some small ones from the Dakota SS (Cenomanian) that I shall look at tonight. Your ammonite also resembles some small Romaniceras (Turonian) that I have found. The Eagle Ford is Cenomanian and Turonian? This is from the Upper Eagle Ford which would be Turonian----Tom 1 Grow Old Kicking And Screaming !!"Don't Tread On Me" Link to comment Share on other sites More sharing options...
PFOOLEY Posted October 23, 2013 Share Posted October 23, 2013 For comparison... Acanthoceras amphibolum (Cenomanian, NM) Romaniceras mexicanum (Turonian, NM) Both belong to the family Acanthoceratidae ... "I am glad I shall never be young without wild country to be young in. Of what avail are forty freedoms without a blank spot on the map?" ~Aldo Leopold (1887-1948) New Mexico Museum of Natural History Bulletins Link to comment Share on other sites More sharing options...
PFOOLEY Posted October 23, 2013 Share Posted October 23, 2013 ...a few more views. Not sure if this will be of any help. Let's see what Mr. Woehr scrounges up. Nifty ammonite nonetheless. "I am glad I shall never be young without wild country to be young in. Of what avail are forty freedoms without a blank spot on the map?" ~Aldo Leopold (1887-1948) New Mexico Museum of Natural History Bulletins Link to comment Share on other sites More sharing options...
Uncle Siphuncle Posted October 23, 2013 Share Posted October 23, 2013 yall may b on track better than i was. can't get to my books at the moment, but will. Grüße, Daniel A. Wöhr aus Südtexas "To the motivated go the spoils." Link to comment Share on other sites More sharing options...
Foshunter Posted October 23, 2013 Author Share Posted October 23, 2013 Thank you Mr. Dan always respect your opinion----Tom Grow Old Kicking And Screaming !!"Don't Tread On Me" Link to comment Share on other sites More sharing options...
Uncle Siphuncle Posted October 23, 2013 Share Posted October 23, 2013 sometimes my opinion is so far off track that it serves only as a "discussion facilitator"! Grüße, Daniel A. Wöhr aus Südtexas "To the motivated go the spoils." Link to comment Share on other sites More sharing options...
BobWill Posted October 23, 2013 Share Posted October 23, 2013 I think Dan was on the right track looking at the ventral tubercles. One PFOOLEY ammo has a row down the center of the venter like yours and the other a double row in the middle flanked by two more on each side of them, one of those on the ventral margin. I'll let PFOOLEY say which is which. Link to comment Share on other sites More sharing options...
Uncle Siphuncle Posted October 23, 2013 Share Posted October 23, 2013 Upon inspection of Plate 9 of Late Cenomanian and Turonian Ammonite Faunas from Northeast and Central Texas, Kennedy, 1988, I'll again weigh in with my initial knee jerk response, Euomphaloceras. I've included Plate 9 for y'all's inspection. Figs. 1-3, 5-7 and 9-12 are Euomphaloceras. While the ribs and tubercles are similar to Tom's specimen, have a look at the occasional crazy long spines in Figs 7 and 11, then notice that Tom's also has one of these spines at about the 11:30 position on the juvenile whorl. I think this might be diagnostic of the genus. Y'all have a look and let me know what you think. Boneman could have resolved this conundrum in a jiffy....Turonian ammonites were one of his bailiwicks. 1 Grüße, Daniel A. Wöhr aus Südtexas "To the motivated go the spoils." Link to comment Share on other sites More sharing options...
Uncle Siphuncle Posted October 23, 2013 Share Posted October 23, 2013 I've found partial Euomphaloceras in the past, amongst the more common Notopocorystes crabs, so perhaps your site, Tom, is Upper Britton equivalent. Grüße, Daniel A. Wöhr aus Südtexas "To the motivated go the spoils." Link to comment Share on other sites More sharing options...
Foshunter Posted October 23, 2013 Author Share Posted October 23, 2013 Thanks Dan, I think we will have the answer to who this little guy is------BUT------I guess I have lived a sheltered life, what on earth is BAILIWICKS? Yes, Brent is missed----Tom Grow Old Kicking And Screaming !!"Don't Tread On Me" Link to comment Share on other sites More sharing options...
truceburner Posted October 23, 2013 Share Posted October 23, 2013 Since I have nothing to offer on the ID of this specimen, perhaps I can help with the bailiwick definition: http://lmgtfy.com/?q=bailiwick+definition&l=1 Link to comment Share on other sites More sharing options...
FossilDAWG Posted October 23, 2013 Share Posted October 23, 2013 Just seeing this thread now, but I'd be pretty confident with Euomphaloceras. It looks just like a couple of specimens I have from New Mexico, and I have collected it from the Britton. Don 1 Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now