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Showing results for tags 'turonian'.
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From the album: Texas Turonian (Cretaceous)
Ptychodus cf. mammilaris (lateral file) Turonian Texas -
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From the album: Texas Turonian (Cretaceous)
Ptychodus mammilaris Turonian Texas Textbook P. mammilaris tooth, medial file.- 6 comments
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From the album: Texas Turonian (Cretaceous)
Scapanorhynchus raphiodon. Turonian Texas Differentiating S. raphiodon and S.texanus is tricky, and in the cases of lateral teeth like this, it gets trickier, as S. texanus has variable laterals that share characteristics generally associated with S. raphiodon, such as weakly striated blades. According to Becker et. al in the 2003 paper "Chondrichthyans from the Lower Ferron Sandstone Member of the Mancos Shale (Upper Cretaceous: Middle Turonian) of Emery and Carbon Counties, Utah, USA", S.raphiodon can be distinguished from the later occurring S. texanus by -
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From the album: Texas Turonian (Cretaceous)
Ptychodus sp. (undescribed taxon) SCALE BAR= 1cm Turonian Texas This tooth belongs to a species of Ptychodus that's similar to P. anonymous that will be described in a paper set to publish very soon. ID of this tooth was verified by Shawn Hamm. -
From the album: Texas Turonian (Cretaceous)
Squalicorax cf. falcatus Turonian Texas Variation within Squalicorax falcatus. Since they all came from the same locality, odds are overwhelmingly favorable that they all represent the exact same taxon. Squalicorax exhibits great variation within the same species, and, of course, by tooth position in the mouth.-
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The North American Tyrannosauroidea Species from the Aptian-Santonian Cretaceous
Joseph Fossil posted a topic in General Fossil Discussion
The Tyrannosaur Dinosaurs (Tyrannosauroidea) inhabited North America from 152 Million Years ago during the Late Jurassic era up until 66 Million Years ago during the Late Cretaceous era. https://www.app.pan.pl/article/item/app20110141.html However, there is a relatively large geologic gap between the time of the Late Jurassic to the Santonian-Campanian stages of the Cretaceous (when the the oldest known Tyrannosaurid Lythronax (Late Creteaceous, 81.9-81.5 Million Years ago) emerged) in terms of the number of Tyrannosauroidae confirmed in North America. However, thi -
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From the album: Texas Turonian (Cretaceous)
Ptychodus (likely P. anonymous) Turonian Texas -
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From the album: Eagle Ford Group
Inoceramid Pearl, DFW Turonian, Cretaceous Apr, 2023 -
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From the album: Eagle Ford Group
Ptychodus decurrens, DFW Turonian, Cretaceous Apr, 2023-
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From the album: Eagle Ford Group
Ptychodus mammillaris, DFW Turonian, Cretaceous Apr, 2023- 1 comment
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From the album: Eagle Ford Group
Cretoxyrhina mantelli, DFW Turonian, Cretaceous Apr, 2023- 1 comment
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Discovering the Kamp Ranch Limestone: Ptychodus Frenzy
EPIKLULSXDDDDD posted a topic in Fossil Hunting Trips
This month I decided to take on the challenge of finding my first Kamp Ranch sites. It's not the easiest thing to do since, to my knowledge, the elusive layer is not mapped anywhere. I spent a lot of time scouring the waterways of North Texas and by the end, I came up with two distant potential spots for a couple days worth of hunting. I traveled to the first site one sunny morning and after a long walk, I finally made it to the water's edge where I met endless limestone slabs filled with Collignoniceras woollgari impressions, meaning I was just in the right place. I readied my roc- 7 replies
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From the album: Eagle Ford Group
Ptychodus marginalis, Travis Co. Turonian, Cretaceous Feb, 2023 A chunky tooth I discovered while processing South Bosque mudstone for microfossils. Never would have expected something so large and so rare to have been sitting in a ziploc in my yard for months just waiting to be extracted!-
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From the album: Eagle Ford Group
Ptychodus anonymous, DFW Turonian, Cretaceous Apr, 2023 This week I made my first venture into the Kamp Ranch of DFW. It was a great spot with loads of Ptychodus. Most of them were only fragments, but I got a handful of keepers. This specimen was the find of the day. I thought it was P. marginalis at first, but @LSCHNELLE suggested P. anonymous was an option and I took a second look. It's a bit higher crowned than most P. marginalis and the marginal area is indistinguishable from the other P. anonymous of the day. I had read that the Turonian morphotype of this species wa-
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From the album: Eagle Ford Group
Ptychodus latissimus, DFW Turonian, Cretaceous Apr, 2023 Ptychodus latissimus is a rare species and is better known from Early Coniacian deposits like the Atco. However, they are not unheard of from the Middle Turonian. This fragment of a tooth is extremely low crowned and possesses few very yet thick transverse ridges. It also has a unique margin. I don't think there is any other Ptychodus species that can match this design better than P. latissimus. I've got a couple more potential Kamp Ranch sites circled so fingers crossed I can find a more complete specimen in the ne -
The Rio Puerco Valley was my introduction to fossils. For many years now, I have scoured its Late Cretaceous shales and sandstones in search of ammonites. Somewhere along the way, my fascination with the ornament grew into an investigation of its environment. Last week at the New Mexico Geologic Society's Spring meeting, I made my first venture into the world of paleontological science. With the help of Dr. Spencer Lucas of the New Mexico Museum of Natural History, I presented a poster/abstract (Foley & Lucas 2017.pdf) exhibiting my ideas. I received so- 83 replies
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Discovering the unexpected in the Texas Turonian (March 2023)
Jared C posted a blog entry in Trip Reports
Perhaps the most definitive, lasting project I've had during my short time in paleo is the excavation and study of a basal mosasaur skeleton my step brother and I found in September of 2021 (If you missed it, it's in my blogs on my profile). The site is on a fairly inconspicuous outcrop of the Eagle Ford formation, in a zone that's atypical for the upper eagle ford, as the rock itself is very condensed compared to what is usual for the upper kef. Notably, while Mosasaur material is very, very rare in the kef (kef is an abbreviation for the Eagle Ford formation), it pokes out with greater frequ -
From the album: Post Oak Creek
P. atcoensis was a rare species of durophagous shark that lived during the Late Cretaceous. Its contemporary P. whipplei was far more abundant and tended to have a higher, bullet-shaped crown; this disparity in morpholgy suggests they may have preyed on different things. From Shawn Hamm's thesis: "Diagnosis. Tooth Crown high and rounded, oriented 90° to the margin area in the medial files; crown crossed by six to eight thick, chevron-shaped parallel ridges; lateral files have moderately high crowns with four to five parallel ridges; posterior teeth are low crowned with two to three ridg -
From the album: Post Oak Creek
P. atcoensis was a rare species of durophagous shark that lived during the Late Cretaceous. Its contemporary P. whipplei was far more abundant and tended to have a higher, bullet-shaped crown; this disparity in morpholgy suggests they may have preyed on different things. From Shawn Hamm's thesis: "Diagnosis. Tooth Crown high and rounded, oriented 90° to the margin area in the medial files; crown crossed by six to eight thick, chevron-shaped parallel ridges; lateral files have moderately high crowns with four to five parallel ridges; posterior teeth are low crowned with two to three ridg-
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From the album: Post Oak Creek
When I initially found this I was hoping it was Mosasaurid, however upon some reading, I decided it's more likely to be a sister group squamate. In particular, the labial sulcus convinced me it is probably C. crassidens (see Caldwell 1999). It is however much larger than any Coniasaurus teeth I've seen published. -
From the album: Squamates
When I initially found this I was hoping it was Mosasaurid, however upon some reading, I decided it's more likely to be a sister group squamate. In particular, the labial sulcus convinced me it is probably C. crassidens (see Caldwell 1999). It is however much larger than any Coniasaurus teeth I've seen published. -
From the album: Eagle Ford Group
Cretoxyrhina mantelli, Denton Co. Turonian, Cretaceous Jan, 2023 -
I have problem with this enigmatic shark tooth. Location- Poland, Zabierzów (Cracow Area) Age- Cretaceous. Turonian Size- 2mm
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I recently found an echinoid in the Prionocyclyus hyatti ammonite zone of the Upper Cretaceous (Middle Turonian) Semilla Sandstone Member of the Carlile Shale. These creatures are not common and until now... ...I have only found fragments. After a quick clean and some photos, I wonder if there is enough diagnostic material left on this crushed and eroded specimen. scale= 1/4" I do not know much about echinoderms, but I am very much interested in learning
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From the album: Eagle Ford Group
Prionocyclus bosquensis, Denton Co. Turonian, Cretaceous Jan, 2023 I found a nice spot absolutely filled with these small ammonites. I'm fairly confident these are P. bosquensis, but if anyone has a contending opinion, feel free to share. Anisomyon sp. was also found in the same spot, suggesting this is from the uppermost Arcadia Park.-
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