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This concretion was actually from a fossil trip last year. Its two ammonites in one rock but the bigger ammo has half of its beak right in front of the appature. Amazing. These are known as Rhaeboceras halli and are from the Bearpaw Shales of eastern Montana. He brought it over to my garage and wants me to 'clean' it up. RB
I thought the mosasaur fans here might enjoy a fairly recent bit of mosa-research… This paper describes the very well preserved skull and associated postcrania (a few vertebrae, some pectoral and pelvic girdle elements, a partial forelimb and a hindlimb) of a new tylosaurine mosasaur species, Tylosaurus saskatchewanensis. The holotype material of this tylosaur is from the Upper Campanian (Late Cretaceous) Bearpaw Formation of Saskatchewan, Canada. The paper: Jiménez-Huidobro et al. 2018 new Tylosaurus species.pdf A sneak peak at some of the material described (articulated dorsal vertebrae) - scale bar is 10cm: Hope you guys like it