VERY RARE Fossil Heteromorph Ammonite DISCOSCAPHITES NEBRASCENSIS with Gastropods – Fox Hills Formation, Maastrichtian, Cretaceous: USA

Description This listing showcases a VERY RARE and scientifically remarkable fossil of the heteromorph ammonite Discoscaphites nebrascensis, beautifully accompanied by fossilised gastropods on the matrix. This exceptional piece originates from the Fox Hills Formation of the Pierre Shale Group, located in South Dakota, USA — a formation celebrated for preserving life from the final chapters of the Cretaceous. Discoscaphites nebrascensis is a distinguished member of the family Scaphitidae, superfamily Scaphitoidea, and order Ammonitida. This heteromorph ammonite displays a partially uncoiled, hook-like shell structure — an evolutionary departure from the tightly coiled ammonites, possibly reflecting ecological adaptations in the receding waters of the Western Interior Seaway. Geological & Scientific Details: Scientific Name: Discoscaphites nebrascensis Fossil Type: Heteromorph Ammonite with Gastropods Geological Period: Cretaceous Stage: Maastrichtian (approx. 72–66 million years ago) Formation: Fox Hills Formation (Pierre Shale Group) Location Found: South Dakota, United States Order: Ammonitida Superfamily: Scaphitoidea Family: Scaphitidae Morphological Features: Uncoiled heteromorph shell with prominent ribbing and paired with fossil gastropods on matrix Depositional Environment: Marine to marginal marine conditions within the Western Interior Seaway This specimen is particularly significant for its stratigraphic position near the Cretaceous–Paleogene (K–Pg) boundary. Discoscaphites nebrascensis is one of the few ammonite taxa believed to have briefly persisted into post-impact sediments, contributing to our understanding of extinction patterns. All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity. Please Note: Scale Rule Squares / Cube = 1cm – full sizing is shown in the photo The fossil pictured is the actual item you will receive, carefully selected for quality, preservation, and scientific interest This is a top-tier collector’s specimen, ideal for palaeontological collections, research interest, educational display, or anyone passionate about Earth’s prehistoric marine heritage.