Nimravis Posted November 14, 2017 Share Posted November 14, 2017 Looking for an ID on two tiny ammonites that I have had in my collection for a long time. The id that I have on them is "Acanthoceras worthense" from the Cretaceous of Roanote, Texas. Just looking for confirmation or correction. Thanks. Link to comment Share on other sites More sharing options...
doushantuo Posted November 14, 2017 Share Posted November 14, 2017 Might be Stoliczkaia(Lamnayella) worthense 2 Link to comment Share on other sites More sharing options...
Fossildude19 Posted November 14, 2017 Share Posted November 14, 2017 @BobWill @erose @Uncle Siphuncle @PFOOLEY @Ludwigia 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...
Uncle Siphuncle Posted November 14, 2017 Share Posted November 14, 2017 I have some of them from that area, but never chased down ID. They occur in gray, marly zones in the Fort Worth and/or Duck Creek fms. 2 Grüße, Daniel A. Wöhr aus Südtexas "To the motivated go the spoils." Link to comment Share on other sites More sharing options...
BobWill Posted November 14, 2017 Share Posted November 14, 2017 1 hour ago, Uncle Siphuncle said: I have some of them from that area, but never chased down ID. They occur in gray, marly zones in the Fort Worth and/or Duck Creek fms. Neither have I. Are the the same ones that come pyritized fro th e Waco Pit? Link to comment Share on other sites More sharing options...
Nimravis Posted November 14, 2017 Author Share Posted November 14, 2017 6 minutes ago, BobWill said: Neither have I. Are the the same ones that come pyritized fro th e Waco Pit? To be honest with you, they do look a little pyritized. Link to comment Share on other sites More sharing options...
Ludwigia Posted November 14, 2017 Share Posted November 14, 2017 Sorry, but I'm not so good with Texan Cretaceous. Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
PFOOLEY Posted November 16, 2017 Share Posted November 16, 2017 On 11/13/2017 at 10:39 PM, Nimravis said: Looking for an ID on two tiny ammonites... Could we see a shot of the venter? "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...
Nimravis Posted November 16, 2017 Author Share Posted November 16, 2017 58 minutes ago, PFOOLEY said: Could we see a shot of the venter? I will take some different views when I get home and will try with a digital microscope since they are really small. Link to comment Share on other sites More sharing options...
PFOOLEY Posted November 16, 2017 Share Posted November 16, 2017 (edited) @Nimravis, you might want to compare with Plate 1* (pg. 151), figures 11-13 in The Weno and Pawpaw formations of the Texas Comanchean at the Biodiversity Heritage Library. * Edited November 16, 2017 by PFOOLEY plate image attached 3 "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...
Nimravis Posted November 17, 2017 Author Share Posted November 17, 2017 12 hours ago, PFOOLEY said: Could we see a shot of the venter? The original shot for reference- Hope the below pics help with the ID. Close ups of the larger one on the left- Close ups of the smaller one on the right- 1 Link to comment Share on other sites More sharing options...
PFOOLEY Posted November 18, 2017 Share Posted November 18, 2017 Adkins describes the shell of A. worthense as being keelless...I would be inclined to say that your specimens are not A. worthense. 2 "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...
KimTexan Posted November 18, 2017 Share Posted November 18, 2017 Little cuties. Very nice and sweet looking ammonites. What is the green on the larger one? I don’t see that @DPS Ammonite has chimed in. I’m not sure how extensive his ammonite knowledge is, but with a name like that he’s got to know a fair bit about them. Maybe he would know something. Also @JohnJ He’s more into the upper cretaceous I think, but I know he has a collection of some small ammonites here on TFF. He might know something or be able to point you in the right direction. 1 Link to comment Share on other sites More sharing options...
doushantuo Posted November 18, 2017 Share Posted November 18, 2017 This is also a comprehensive review of Texan ammonites. Link to comment Share on other sites More sharing options...
doushantuo Posted November 18, 2017 Share Posted November 18, 2017 As is this Both monographs shown are more or less contemporaneous with Adkins,he MIGHT not have known of their existence 2 Link to comment Share on other sites More sharing options...
Nimravis Posted November 18, 2017 Author Share Posted November 18, 2017 2 hours ago, KimTexan said: What is the green on the larger one? I do not know, saw it when I used the Digital microscope- I'm starting to think it is from Outer Space, something similar "The Green Slime". 2 Link to comment Share on other sites More sharing options...
KimTexan Posted November 18, 2017 Share Posted November 18, 2017 It almost looks like something soft like gel, which wouldn’t make sense. I suppose it could have been found in a creek and have algae on it, but I was wondering if it might be a mineral of some kind. Link to comment Share on other sites More sharing options...
Tidgy's Dad Posted November 18, 2017 Share Posted November 18, 2017 Yes, it looks like uvarovite but is unlikely to be. My guess is tiny malachite crystals, formed from the erosion of copper minerals rather than in a hydrothermal vein. 2 Life's Good! Tortoise Friend. Link to comment Share on other sites More sharing options...
Nimravis Posted November 18, 2017 Author Share Posted November 18, 2017 @KimTexan and @Tidgy's Dad they are definitely crystals. 1 Link to comment Share on other sites More sharing options...
Tidgy's Dad Posted November 18, 2017 Share Posted November 18, 2017 I'll stick with malachite as being the most likely contender. 2 Life's Good! Tortoise Friend. Link to comment Share on other sites More sharing options...
KimTexan Posted November 19, 2017 Share Posted November 19, 2017 That is pretty cool. They’re a beautiful color of crystal. I wasn’t familiar with malachite, it reminded me a little of beryl in color, but not form so much. I believe malachite is probably correct. Still that just makes those little gyms all the more special and so very cool. 1 Link to comment Share on other sites More sharing options...
BobWill Posted November 19, 2017 Share Posted November 19, 2017 Okay, this one's making me a little crazy. We can rule out Acanthoceras and Stoliczkaia now that we see the whorl profile. I assume Nimravis meant to say Roanoke instead of Roanote Texas which would most likely put in the Pawpaw Formation of the Lower Cretaceous but the only thing I can find even close to the right size that mostly matches the available features is Prioncyclites mite Kennedy 1988 which is from the Upper Cretaceous, Eagle Ford Group. That might explain why I thought I had seen these at the Waco Pit site but they don't belong at Roanoke. Dan said he has seen them in Duck Creek or Ft. Worth Limestone which are also Washita Group. That means they don't belong either of those places either so it has to be something else but I sure don't know what. 2 Link to comment Share on other sites More sharing options...
doushantuo Posted November 19, 2017 Share Posted November 19, 2017 can recommend: Link to comment Share on other sites More sharing options...
bone2stone Posted November 19, 2017 Share Posted November 19, 2017 8 hours ago, KimTexan said: That is pretty cool. They’re a beautiful color of crystal. I wasn’t familiar with malachite, it reminded me a little of beryl in color, but not form so much. I believe malachite is probably correct. Still that just makes those little gyms all the more special and so very cool. The green is most likely remnants of the backing these specimens were once glued to. There is no malachite in the area of Texas where these are suppose to be from. The preservation of these two cephalopods is reminiscent of the Paw Paw material from the Handley area near the old Channel 11 broadcast tower. The one without the keel may be scaphites. I think Bob Wills is on to something with his input. Lance has some good stuff on these as well, he has some on his web stated as being from the del Rio Waco Pit material. Jess B. 2 Link to comment Share on other sites More sharing options...
Bobby Rico Posted November 19, 2017 Share Posted November 19, 2017 Green slime maybe also be a very similar mineral too malachite also found with copper ore called Euchroite . But I don’t know if you find that mineral in Texas . Green slime looks like a good Sunday afternoon film. cheers Bobby 1 Link to comment Share on other sites More sharing options...
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