Mancos Group Field Trip Guide

 

Revisiting the Cretaceous Mancos Group in Utah—problems, previous methods, and new perspectives on a world-class Cretaceous marine section.  James I. Kirkland, M. Ryan King, Kevin G. Bylund, 2025 

Early Dienerian Ammonoids

Gyronites rigidus (Diener) 1897

 EARLY DIENERIAN AMMONOIDS AND NAUTILOIDS AND A NEW LATE GRIESBACHIAN AMMONOID SITE FROM THE DINWOODY FORMATION (THAYNES GROUP) AT CRITTENDEN SPRINGS, ELKO COUNTY, NEVADA James F Jenks, Takumi Maekawa, Yasunari Shigeta, David Ware, Arnaud Brayard, Kevin G Bylund, Daniel A Stephen, Noreen Kittrick, 2025