page_title: Hosselkus Limestone
section_title: Vertebrates
hierarchical_section_title: Hosselkus Limestone / Vertebrates
caption_attribution_description: Thalattosaurus alexandrae (left) and Nectosaurus halinus (right) of Late Triassic California
context_page_description: The Hosselkus Limestone is an Upper Triassic fossiliferous marine micritic limestone formation that outcrops in Plumas and Shasta Counties, California. It is known for its invertebrate fauna, most notably the many species of shelled cephalopods.
caption: Thalattosaurus and Nectosaurus
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