erose Posted November 26, 2016 Share Posted November 26, 2016 The folks from the Jackson School of Geology, Vertebrate Paleontology department at the University of Texas brought a Ptychodus rugosus specimen to Fossil Fest last weekend. It was an old specimen but perfect and HUGE! maybe 2-inches (55mm) wide. Regretting not getting a picture of it. Can anyone put age ranges on those listed above? Sometimes sorting them out is a lot easier when you can eliminate those too young or too old for your local. PS LSCHNELLE set up a great display that included those teeth from our local strata. Link to comment Share on other sites More sharing options...
LSCHNELLE Posted November 26, 2016 Share Posted November 26, 2016 Pics of Ptychodus teeth dentition with slightly out of focus larger tooth. Also, age chart - modified by me for Austin courtesy of Shawn Hamm's thesis. 8 Link to comment Share on other sites More sharing options...
erose Posted November 29, 2016 Share Posted November 29, 2016 Lee, So glad you snapped some pics! Link to comment Share on other sites More sharing options...
LSCHNELLE Posted November 29, 2016 Share Posted November 29, 2016 The UT students said the huge single Ptychodus tooth was not a trustworthy ID as P. Rugosus - even though they can be up to 80mm wide. My understanding from Shawn Hamm's MS paper is that P. Rugosus has a bulbous and often offset from center crown which this tooth did not have. This tooth looks more like a huge P. Marginalis because of the concentric circles. Or, if from England, it could be P. Polygyrus. The dentition is a harder ID. I would guess that it is a very large P. Decurrens due to its bifurcating transverse ridges extending to marginal edge and due to its numerous fine ridges on the labial and lingual margins perpendicular to the transverse ridges. 2 1 Link to comment Share on other sites More sharing options...
LSCHNELLE Posted November 29, 2016 Share Posted November 29, 2016 Erose: Hopefully, the colored chart gives you the age and formation ranges that were looking for on Central Texas Ptychodus teeth. Link to comment Share on other sites More sharing options...
HFVC Fossils Posted December 8, 2016 Share Posted December 8, 2016 Wow, a pretty neat resource here. Cool! Link to comment Share on other sites More sharing options...
rocket Posted March 8, 2018 Share Posted March 8, 2018 the decurrens is cool we have had one from middle turonian of western Germany, posted in the collectors Forum "Steinkern" https://www.steinkern.de/steinkern-de-galerie/kreide/oberkreide/dortmund/ptychodus-decurrens-aus-dem-mittelturon-von-dortmu.html normally the decurrens is rare in Germany, we have more mamillaris Link to comment Share on other sites More sharing options...
rocket Posted March 8, 2018 Share Posted March 8, 2018 On 11/26/2016 at 5:49 PM, LSCHNELLE said: Pics of Ptychodus teeth dentition with slightly out of focus larger tooth. Also, age chart - modified by me for Austin courtesy of Shawn Hamm's thesis. wow, incredible..., the Maximum you can find in a ptychodus-collectors life... thanks for posting Link to comment Share on other sites More sharing options...
truceburner Posted December 20, 2018 Share Posted December 20, 2018 Here's a Ptychodus tooth I recently found in a gravel bar in Austin TX, presumably from the late Santonian Ozan formation. I just heard back from renowned Ptychodus researcher Shawn Hamm, who said it was a P. martini. Certainly the largest, most well-preserved tooth in my collection. 7 Link to comment Share on other sites More sharing options...
Coco Posted December 21, 2018 Share Posted December 21, 2018 Hi, What a beauty ! Coco ---------------------- OUTIL POUR MESURER VOS FOSSILES : ici Ma bibliothèque PDF 1 (Poissons et sélaciens récents & fossiles) : ici Ma bibliothèque PDF 2 (Animaux vivants - sans poissons ni sélaciens) : ici Mâchoires sélaciennes récentes : ici Hétérodontiques et sélaciens : ici Oeufs sélaciens récents : ici Otolithes de poissons récents ! ici Un Greg... Link to comment Share on other sites More sharing options...
Tidgy's Dad Posted December 21, 2018 Share Posted December 21, 2018 Massive and gorgeous tooth! And what a great thread this is, very useful and informative. Life's Good! Tortoise Friend. Link to comment Share on other sites More sharing options...
Ludwigia Posted December 21, 2018 Share Posted December 21, 2018 On 12/20/2018 at 5:57 PM, truceburner said: Yummy!! Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
LSCHNELLE Posted February 11, 2019 Share Posted February 11, 2019 Truceburner - Flawless jumbo tooth.!! I still don't have P. martini and P. rugosus in my Travis County collection. And my largest (>25mm TW) teeth (except the pictured P. latissimus from the Atco member lag deposits) all have some apical wear flaw on the crown. What are the dimensions of yours in mm? 1 Link to comment Share on other sites More sharing options...
truceburner Posted February 12, 2019 Share Posted February 12, 2019 @LSCHNELLE The specimen shown in my post above is 27mm wide and 22mm front to back. I don't know the crown height. Is crown height usually measured from the margin? Link to comment Share on other sites More sharing options...
LSCHNELLE Posted February 13, 2019 Share Posted February 13, 2019 3 hours ago, truceburner said: @LSCHNELLE The specimen shown in my post above is 27mm wide and 22mm front to back. I don't know the crown height. Is crown height usually measured from the margin? BTW - Large size tooth in excellent condition. Congrats. I am jealous! I don't normally hunt fossils on the east side of town. You will need to look at the explanation in Shawn Hamm's thesis. He will be coming out with an update soon. Here is a pic showing how to measure of crown height. Sometimes, it would be from the edge if there is no marginal area. 3 Link to comment Share on other sites More sharing options...
Ms Michal Posted March 6, 2019 Share Posted March 6, 2019 Wowzer I would never had guessed those were teeth. Amazing photos thank you for sharing. Link to comment Share on other sites More sharing options...
Ms Michal Posted March 8, 2019 Share Posted March 8, 2019 Great read this has been very informative. I have quite a bit of small Hematite I haven't sorted yet. I will be checking for pieces that look like the pictures. I'm an indiscriminate rockhounder. I pick up whatever I like the looks of. Which is what led me on this journey. Thank you all for taking the time to put this resource together. Link to comment Share on other sites More sharing options...
Ramo Posted January 22, 2020 Share Posted January 22, 2020 The New Mexico Museum of Natural History has published a new Monogram by Shawn Hamm on ptychodus. Right now I think the only way to order is to call them and order over the phone. I haven't seen it yet, but I have one on the way! 3 For one species to mourn the death of another is a new thing under the sun. -Aldo Leopold Link to comment Share on other sites More sharing options...
LSCHNELLE Posted January 24, 2020 Share Posted January 24, 2020 Ramo: I got mine on January 16th. Your associated tooth Ptychodus anonymous find has been very helpful to me and it is on full display in Bulletin 81. 1 Link to comment Share on other sites More sharing options...
fifbrindacier Posted January 27, 2020 Share Posted January 27, 2020 On 11/26/2016 at 5:49 PM, LSCHNELLE said: Pics of Ptychodus teeth dentition with slightly out of focus larger tooth. Also, age chart - modified by me for Austin courtesy of Shawn Hamm's thesis. On 12/20/2018 at 5:57 PM, truceburner said: Here's a Ptychodus tooth I recently found in a gravel bar in Austin TX, presumably from the late Santonian Ozan formation. I just heard back from renowned Ptychodus researcher Shawn Hamm, who said it was a P. martini. Certainly the largest, most well-preserved tooth in my collection. On 2/11/2019 at 3:11 PM, LSCHNELLE said: Truceburner - Flawless jumbo tooth.!! I still don't have P. martini and P. rugosus in my Travis County collection. And my largest (>25mm TW) teeth (except the pictured P. latissimus from the Atco member lag deposits) all have some apical wear flaw on the crown. What are the dimensions of yours in mm? On 2/12/2019 at 10:18 PM, LSCHNELLE said: BTW - Large size tooth in excellent condition. Congrats. I am jealous! I don't normally hunt fossils on the east side of town. You will need to look at the explanation in Shawn Hamm's thesis. He will be coming out with an update soon. Here is a pic showing how to measure of crown height. Sometimes, it would be from the edge if there is no marginal area. Gorgeous teeth ! "On ne voit bien que par le coeur, l'essentiel est invisible pour les yeux." (Antoine de Saint-Exupéry) "We only well see with the heart, the essential is invisible for the eyes." In memory of Doren Link to comment Share on other sites More sharing options...
Fossildude19 Posted February 12, 2020 Share Posted February 12, 2020 Here is another topic those searching here may be interested in: 1 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...
archeria Posted February 18, 2020 Share Posted February 18, 2020 thank you so much for making this convenient guide,Tony! Now I can identify the ptychodus tooth I found in a farm at Kansas as Ptychodus whipplei. Link to comment Share on other sites More sharing options...
Fossil-Hound Posted February 19, 2020 Share Posted February 19, 2020 I'll send you a picture of one I have tomorrow if you remind me. Do or do not. There is no try. - Yoda Link to comment Share on other sites More sharing options...
Seaspawn Posted January 14, 2021 Share Posted January 14, 2021 These are honestly beautiful. Geographically speaking I'm guessing they're mostly found in the southern region of North America? I honestly would not have known at a glance that this was a tooth at all. Thanks so much for the guide. Link to comment Share on other sites More sharing options...
RobinS87 Posted April 7, 2021 Share Posted April 7, 2021 Hey! Who is the expert in the matter. Can someone give a personal consultation? write to direct! Link to comment Share on other sites More sharing options...
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