{"product_id":"didymoceras-stevensoni-heteromorph-ammonite-fossil-on-matrix-south-dakota","title":"Didymoceras Stevensoni Heteromorph Ammonite Fossil on Matrix, South Dakota.","description":"\u003cp\u003eAn exceptional and highly sculptural \u003cstrong\u003eheteromorph ammonite fossil, \u003cem\u003eDidymoceras stevensoni\u003c\/em\u003e, preserved and mounted upon its original sedimentary matrix from the Pierre Shale of Custer County, South Dakota\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eUnlike the familiar tightly coiled form associated with most ammonites, \u003cem\u003eDidymoceras\u003c\/em\u003e developed an extraordinary \u003cstrong\u003eopen, helically coiled shell\u003c\/strong\u003e, producing the dramatic looping configuration seen in this specimen. The exposed shell rises prominently from the matrix, displaying pronounced ribbing, projecting tubercles, and the remarkable irregular geometry characteristic of this uncommon Late Cretaceous cephalopod.\u003c\/p\u003e\n\u003cp\u003eThe warm brown fossilized shell contrasts beautifully against the pale buff-colored shale matrix, while associated fossil material embedded within the stone further emphasizes its geological context. Presented almost as a natural sculpture, the specimen has a strong three-dimensional quality and can be appreciated equally as an important natural-history object and as a sophisticated decorative piece.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eDidymoceras stevensoni\u003c\/em\u003e is a recognized \u003cstrong\u003enostoceratid heteromorph ammonite\u003c\/strong\u003e occurring within the Pierre Shale. Current stratigraphic references place its zone in the \u003cstrong\u003eUpper Campanian at approximately 75.2–75.1 million years ago\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDimensions: \u003c\/strong\u003eHeight: 7 in. x  Width: 8 in.  x Depth: 4.5 in. \u003c\/p\u003e\n\u003ch3\u003eDetails\u003c\/h3\u003e\n\u003cul class=\"disc\"\u003e\n\u003cli class=\"decimal\"\u003e\n\u003cp\u003e\u003cstrong\u003eSpecies:\u003c\/strong\u003e \u003cstrong\u003e\u003cem\u003eDidymoceras stevensoni\u003c\/em\u003e\u003c\/strong\u003e (Whitfield, 1877)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli class=\"decimal\"\u003e\n\u003cp\u003e\u003cstrong\u003eType:\u003c\/strong\u003e Heteromorph \/ uncoiled ammonite\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli class=\"decimal\"\u003e\n\u003cp\u003e\u003cstrong\u003eFormation:\u003c\/strong\u003e Pierre Shale\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli class=\"decimal\"\u003e\n\u003cp\u003e\u003cstrong\u003eGeologic Period:\u003c\/strong\u003e Late Cretaceous\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli class=\"decimal\"\u003e\n\u003cp\u003e\u003cstrong\u003eStage:\u003c\/strong\u003e Upper Campanian\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli class=\"decimal\"\u003e\n\u003cp\u003e\u003cstrong\u003eAge:\u003c\/strong\u003e Approximately \u003cstrong\u003e75 million years\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli class=\"decimal\"\u003e\n\u003cp\u003e\u003cstrong\u003eLocality:\u003c\/strong\u003e Custer County, South Dakota\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli class=\"decimal\"\u003e\n\u003cp\u003e\u003cstrong\u003eCountry:\u003c\/strong\u003e \u003cstrong\u003eUnited States\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli class=\"decimal\"\u003e\n\u003cp\u003e\u003cstrong\u003eMaterial:\u003c\/strong\u003e Fossil ammonite on natural matrix\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Pegaso Gallery Design","offers":[{"title":"Default Title","offer_id":52958696112413,"sku":"PGD00027807","price":8600.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/0370\/0419\/files\/0_Fossil_1.jpg?v=1789753562","url":"https:\/\/pegasogallerydesign.com\/products\/didymoceras-stevensoni-heteromorph-ammonite-fossil-on-matrix-south-dakota","provider":"Pegaso Gallery Design","version":"1.0","type":"link"}