WebDepartment of Mineral Resources, North Dakota WebDec 1, 2012 · Sphenodiscus pleurisepta (Conrad, 1857), IMG 8672, Cárdenas Formatio (Maastrichtian), eastcentral Mexico, in ventral (F 1 ), left lateral (F 2 ), and apertural (F3) views. This taxon is among the last species in many North American sections ( Landman et al. 2004a, b; Ifrim and Stinnesbeck 2010 ).

USGS

WebThey are the shells of extinct cephalopods, related to the modern pearly nautilus. Ammonites and nautiloids are prized by paleontologists because they were widespread … Web†Sphenodiscus †Sphenodiscus intermedius †Sphenodiscus lobatus †Sphenodiscus pleurisepta †Sphenodiscus tirensis †Spinosuchus – type locality for genus †Spinosuchus caseanus – type locality for species †Spironema †Spironema perryi; Spiroplectammina †Spiroplectammina ammovitrea †Spiroplectammina goodlandana; Spondylus ... sharing classroom photos

Sphenodiscus lenticularis The Natural Canvas

http://www.fossilscapes.com/ammonites/ammonites3.htm WebNov 16, 2015 · The sphenodiscids, however, are highly fragmented; only 1 of the 11 collected specimens was more than 50% complete. Epizoans are rare, occurring on less … WebSphenodiscus & Hoploscaphites, Late Late Cretaceous, Fox Hills Formation, Bear Creek, Mantry, South Dakota, USA - Houston Museum of Natural Science - DSC01911.JPG 3,223 … poppy lottery