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New mosasaur species named from the Pierre Shale of North Dakota: Jormungandr walhallaensis
pachy-pleuro-whatnot-odon posted a topic in Fossil News
A new mosasaur, related to the genus Clidastes, has been described from the Middle Campanian Pembina Member of the Pierre Shale Formation of North Dakota near the town of Walhalla and has been given the undeniably cool name of Jormungandr walhallaensis, after the world serpent of Norse mythology! Zietlow, Boyd and Van Vranken, 2023. Jormungandr walhallaensis: a new mosasaurine (Squamata: Mosasauroidae) from the Pierre Shale Formation (Pembina Member: Middle Campanian) of North Dakota. -
Hey all. I recently purchased these associated pieces of mosasaur jaw from Kansas and was wondering if someone might be able to ID them. I have a few ideas as to what it might be but I’d like some second opinions. The only information I from the seller was that the specimen was from Phillips county and it was found in the Pierre Shale formation. There was also a small chunk of mosasaur jaw that I got for free as well (last two pictures), but I doubt that can be identified since it is in pretty rough shape. Let me know if I need more pictures and thanks in advance for any and all help.
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A few weeks ago I had the opportunity to look for fossils among additional Pierre Shale outcrops in the Sheyenne River Valley. I didn't post anything about that trip as it came up a bit short and read like my last Pierre Shale trip with more partial specimens. Today I went back to the area to look again, and also made it to an outcrop of the Gregory Member. Low water levels made for a great collection from the Gregory. The DeGrey was rather typical. The side of one of the so-called "Indian Mounds" of the DeGrey member and a frog which was hanging out on the mound. This portion of the river is also the DeGrey. The DeGrey is well exposed in many parts of the state but is often poor in fossils. That fantastic looking ravine produced nothing, not even fragments. Glacial till and boulders are often mixed into the worn outcrops. Some things still grow in the worn shale. Prairie Crocus (Anemone patens) coming up from a few weeks ago. Exposures of the Gregory. The mark of the Gregory, tan claystones compared to the mark of the typical DeGrey, iron manganese carbonate concretions. Frogs were everywhere. I counted 19 frogs in a 7 foot line along the bank here. Freshwater mussels are abundant in the Sheyenne and the low water beached several. Many became muskrat and raccoon snacks. This male Fatmucket (Lampsilis siliquoidea) was one that survived the feast. The first fossil from the Gregory, a nice Baculites.
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Originally the specimen was collected as a concretion from upper Pierre Shale Formation near the lowest level of the Fox Hills Formation. The collection location is Cedar Creek about seven miles south of Glendive, Montana. The Date collected was Oct. 12, 2018. Later, I removed most of the concretion/matrix with diamond blade and bits. Two of the hoploscaphites spedeni were badly crushed and fractured during fossilization and are missing half of shells. During prep, I miscalculated the depth of cutting blade, slightly damaging the middle scaphites.
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