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Showing results for tags 'hell creek formation'.
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From the album: Hell Creek / Lance Formations
Tyrannosaurus rex Hell Creek Fm., Fallon Co., MT, USA The CHR suggests a posterior position for this somewhat beat-up T. rex tooth.-
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Here are two teeth from the Hell Creek formation of Carter County, Montana. Both that been Identified by others as belonging to Nanotyrannus. The first tooth is similar to the one I posted yesterday which comes from a different location. The other is a front tooth. I would appreciate any thought on taxonomy and jaw location, including yesterday's post.
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Identification Tyrannosaur teeth have similarly-sized serrations on each edge, and the serrations are chisel-shaped. This is a classic "Nano-morph" tooth being compressed and blade-like (which is the primitive condition of Tyrannosaurs). Notes This tooth has excellent preservation, with serrations crossing the tip, and clear enamel. There is a minor wear facet near the tip on the lingual side, indicating this is from the left maxilla.
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From the album: Hell Creek / Lance Formations
Dromaeosauridae (Cf. Acheroraptor temertyorum) Hell Creek Fm., Carter Co., MT, USA Acheroraptor's dentition is known incompletely, so it's possible this tooth is from Acheroraptor. Until more material is described, this tooth will remain indeterminate. There may be slight facets, but I'm not confident that's what I'm seeing.-
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From the album: Hell Creek / Lance Formations
Acheroraptor temertyorum Hell Creek Fm., Garfield Co., MT, USA A Velociraptorine tooth with the diagnostic longitudinal ridges Acheroraptor is known for. This tooth has some wear on the tip and root etching at the base. Art by Emily Willoughby-
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Identification A. temertyorum is characterized by the typical Dromaeosaurid traits (compressed, recurved, differing mc/dc serration densities), and longitudinal ridges/facets on the crown face. Notes This tooth was found this past Summer ('21), and in the same county as the holotype specimen.
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Any thoughts on taxonomy of this tooth? It was collected from a horizon in the Hell Creek Formation, Powder River County, Montana that was said to contain Nanotyrannus remains.
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Here is a small tooth, probably a juvenile therapod, from the Hell Creek Formation, Garfield County, Montana. The collected horizon reportedly produces material belonging to 'Nanotyrannus'. Any thoughts on what taxonomy this tooth may represent? It show feeding wear and nice distal serrations, but no mesial.
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From the album: Dinosaurs
Edmontosaurus annectens Hell Creek Fm., Harding Co., SD, USA Partial dental battery Hadrosaurs had the most histologically complex teeth of any animal, with six unique tissues. This allowed for differential wear, creating an ideal coarse surface for grinding plant matter. (Erickson et al. (2012)) -
From the album: Dinosaurs
Acheroraptor temertyorum Hell Creek Fm., Garfield Co., MT, USA Note the diagnostic ridges. -
From the album: Hell Creek / Lance Formations
Lepisosteidae (scales) Hell Creek Fm., Powder River Co., MT, USA Cretaceous gar fish scales - though I may be wrong about the big one.- 1 comment
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From the album: Hell Creek / Lance Formations
Crocodilia (teeth) Hell Creek Fm., Powder River Co., MT, USA Cretaceous Crocodilian teeth - could be from Brachychampsa and/or Borealosuchus?-
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From the album: Hell Creek / Lance Formations
Ceratopsidae (shed/"spit" teeth) Hell Creek Fm., Powder River Co., MT, USA Labeled as "Ceratopsidae" because there are two valid genera currently known from Hell Creek: Triceratops and Torosaurus - whose teeth are indistinguishable. You commonly see teeth like these sold as "Triceratops" spitters, but this is not necessarily a correct identification.-
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Just returned from my fall collecting trip to South Dakota. Will focus on my finds and I've attached a couple of prior trips to see more of the area, fauna, finds and collecting gear. Spring 2021 http://www.thefossilforum.com/index.php?/topic/115998-spring-dinosaur-dig-in-south-dakota/ Fall 2020 http://www.thefossilforum.com/index.php?/topic/109554-collecting-trip-hell-creek-formation/#comments Before I get into my new finds here are some prepped items from my last two trips that I have yet to share A possible Troodontid metatarsal A very weird bone, showed Pete Larsen and he's leaning to a pathologic Digit III Edmontosaurus toe bone. Very odd bone. Good size An nice size Edmontosaurus cervical vertebra about 7.8" High and 13.5" wide Edmontosaurus, a big Chevron, 14.5" long Edmontosaurus, Metacarpal III - 10" Long I was cleaning this Edmontosaurus Digit IV -1 toe bone and a surprise hole popped up became more interesting as I continued clearing it. It has the outer shape and interior profile/curvature of a tyrannosaurid tooth. Is it predation ? I went to show it to Pete Larsen but he was at the Denver show.. Will see him at Tucson. There was no predation marks on the opposite side so not sure. The preservation is pretty solid. Edmontosaurus - Left Dentary about 23 inches long.
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From the album: Hell Creek / Lance Formations
Triceratops prorsus Hell Creek Fm., Harding Co., SD, USA More information-
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From the album: Hell Creek / Lance Formations
Mesodma sp. Hell Creek Fm., Garfield Co., MT, USA P4 (4th upper premolar) Mesodma was a genus of multituberculate mammal that lived in the same environment as many well-known dinosaurs. It must've been a hardy animal, given the genus survived the K-Pg extinction event.-
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From the album: Hell Creek / Lance Formations
Tyrannosaurus rex Hell Creek Fm., Carter Co., MT, USA More information Art by RJ Palmer-
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From the album: Hell Creek / Lance Formations
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From the album: Dinosaurs
Edmontosaurus annectens Hell Creek Fm., Harding Co., SD, USA -
From the album: Dinosaurs
Edmontosaurus annectens Hell Creek Fm., Harding Co., SD, USA-
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Hell Creek Formation Juvenile Tyrannosaurid Teeth
ThePhysicist posted a gallery image in Member Collections
From the album: Dinosaurs
A juxtaposition of the bases of two juvenile Tyrannosaurid tooth crowns from the Hell Creek Formation. Nanotyrannus: Dawson Co., MT Tyrannosaurus: Carter Co., MT- 1 comment
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From the album: Dinosaurs
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Juvenile T. rex maxillary tooth basal cross section
ThePhysicist posted a gallery image in Member Collections
From the album: Dinosaurs
Tyrannosaurus rex Hell Creek Fm., Wibaux Co., MT, USA Minor compression, common in maxillary teeth. It closely matches my larger juvenile T. rex. -
From the album: Dinosaurs
Tyrannosaurus rex Hell Creek Fm., Fallon Co., MT, USA Not in the best shape, but a clearly robust tip with some feeding wear. -
From the album: Dinosaurs
Tyrannosaurus rex Hell Creek Fm., Wibaux Co., MT, USA This is a juvenile Tyrannosaurid tooth. The serration densities are similar on each carina, the serrations are chisel-shaped and robust, the tooth is not recurved, and the mesial carina is straight. It closely resembles my larger T. rex maxillary tooth in cross section.
