Peat Burns Posted December 31, 2019 Share Posted December 31, 2019 Ralph @Nimravis generously gave me these Ammonites. I think he bought them at a garage sale. There was no data with them. I have zero experience with ammonites. I am hoping someone will be able to put a genus name on one or more of them or even venture a guess as to from where they may have come and what time period. Does that matrix / assemblage look familiar to anyone? One appears to be a heteromorph. I think I see Inoceramus in there. Maybe Cretaceous? Texas? They are all the same color (differences in color between the pieces in the photos is due to different lighting). Scale is in cm/mm. Link to comment Share on other sites More sharing options...
mikeymig Posted December 31, 2019 Share Posted December 31, 2019 6 minutes ago, Peat Burns said: A species of Scaphites. 3 Many times I've wondered how much there is to know. led zeppelin Link to comment Share on other sites More sharing options...
Fossildude19 Posted December 31, 2019 Share Posted December 31, 2019 @Uncle Siphuncle @Heteromorph @DPS Ammonite @BobWill @erose 2 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 January 1, 2020 Share Posted January 1, 2020 Not quite recognizing the matrix as native Texan. 3 Grüße, Daniel A. Wöhr aus Südtexas "To the motivated go the spoils." Link to comment Share on other sites More sharing options...
FossilDAWG Posted January 1, 2020 Share Posted January 1, 2020 The Scaphites is something along the lines of Scaphites warreni or similar species. Possibly Western interior rather than Texas. Maybe @jpc or @PFOOLEY will recognize these ammonites. Don 1 Link to comment Share on other sites More sharing options...
PFOOLEY Posted January 1, 2020 Share Posted January 1, 2020 36 minutes ago, FossilDAWG said: The Scaphites is something along the lines of Scaphites warreni or similar species. Possibly Western interior rather than Texas. Maybe @jpc or @PFOOLEY will recognize these ammonites. Don It looks to me like an Upper Middle Turonian Ammonite assemblage...compare with the Prionocyclus wyomingensis zone Ammonoids. There is a good paper on Collignoniceratids of the Western Interior that may be very useful. 6 "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...
BobWill Posted January 1, 2020 Share Posted January 1, 2020 Without knowing the age or location to verify it I would guess the first ones with the closely-spaced ribs were very similar looking to some species of Oxytropidoceras. Too vague? 1 Link to comment Share on other sites More sharing options...
PFOOLEY Posted January 1, 2020 Share Posted January 1, 2020 A REVISION OF THE TURONIAN MEMBERS OF THE AMMONITE SUBFAMILY COLLIGNONICERATINAE FROM THE UNITED STATES WESTERN INTERIOR AND GULF COAST 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...
jpc Posted January 1, 2020 Share Posted January 1, 2020 It looks a lot like our local Frontier Formation (Carlile Fm in eastern WY and SW SD) which is Cenomanian/Turonian. I agree with PFooley. I see Prionocyclus and Scaphites. I cannot tell the difference between P wyomingensis and novimexicanus, but the matrix and reservation surely could be from around here, or South Dakota. the paper Pfooley mentioned above should be helpful. 2 Link to comment Share on other sites More sharing options...
Peat Burns Posted January 1, 2020 Author Share Posted January 1, 2020 16 hours ago, mikeymig said: A species of Scaphites. 16 hours ago, Fossildude19 said: @Uncle Siphuncle @Heteromorph @DPS Ammonite @BobWill @erose 15 hours ago, Uncle Siphuncle said: Not quite recognizing the matrix as native Texan. 14 hours ago, FossilDAWG said: The Scaphites is something along the lines of Scaphites warreni or similar species. Possibly Western interior rather than Texas. Maybe @jpc or @PFOOLEY will recognize these ammonites. Don 14 hours ago, PFOOLEY said: It looks to me like an Upper Middle Turonian Ammonite assemblage...compare with the Prionocyclus wyomingensis zone Ammonoids. There is a good paper on Collignoniceratids of the Western Interior that may be very useful. 11 hours ago, BobWill said: Without knowing the age or location to verify it I would guess the first ones with the closely-spaced ribs were very similar looking to some species of Oxytropidoceras. Too vague? 10 hours ago, PFOOLEY said: A REVISION OF THE TURONIAN 10 hours ago, jpc said: It looks a lot like our local Frontier Formation (Carlile Fm in eastern WY and SW SD) which is Cenomanian/Turonian. I agree with PFooley. I see Prionocyclus and Scaphites. I Thank you all for your help. This will give me something to move forward on. Looks like I can record them as late Cretaceous. Thanks again. Link to comment Share on other sites More sharing options...
grandpa Posted January 2, 2020 Share Posted January 2, 2020 Looks to me like E. WY Pierre Shale Fm. or SW corner of S. Dakota Fox Hills Fm. 1 Link to comment Share on other sites More sharing options...
Peat Burns Posted January 2, 2020 Author Share Posted January 2, 2020 43 minutes ago, grandpa said: Looks to me like E. WY Pierre Shale Fm. or SW corner of S. Dakota Fox Hills Fm. Thanks Grandpa. The surface on my material is rust brown / oxidized, but the interior, when cut is dark gray. I do have some Pierre Shale material, but the ammonites are much better preserved in that, and it lacks the rust color. Link to comment Share on other sites More sharing options...
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