4 CONTENTS. 



Cretaceous deposits of the eastern Gulf region — Continued. 



Faunal zones and subzones — Continued. Page. 



Distribution and range of the species 23 



Basal beds of the Eutaw formation 25 



Range of the species 25 



Correlation 25 



Invertebrates 25 



Plants 26 



Vertebrates 27 



Exogyra ponderosa zone 27 



Range of the species -. . . 27 



Subzones 28 



Occurrence of the fossils 28 



Mortoniceras subzone 29 



Part of Exogyra ponderosa zone between the Mortoniceras subzone and the Exogyra costata zone. . 30 



Correlation 31 



Invertebrates 31 



The Carolinas 31 



New Jersey 31 



Texas 32 



Vertebrates 32 



Plants ." 33 



Exogyra costata zone 34 



Range of the species 34 



Subzones 36 



Occurrence of the fossils 36 



Liopistha protexta subzone 36 



Extreme Upper Cretaceous beds 37 



Correlation 37 



Invertebrates 37 



The ( 'arolinas 37 



New Jersey 38 



Texas 38 



Vertebrates 38 



Plants 39 



Summary 39 



Species and varieties of Exogyra from the eastern Gulf region and the Carolinas 41 



Introduction 41 



Definition of the genus 41 



Geologic range of the genus 42 



General description of the species and varieties 42 



Geologic and geographic range 43 



Eastern Gulf region and the Carolinas 43 



New Jersey 44 



Western Gulf region 45 



Mexico 45 



Utah 45 



Systematic descriptions 46 



Genus Exogyra Say 46 



Exogyra upatoiensis sp. nov 46 



Description 46 



Geologic occurrence 46 



Localities 46 



Exogyra ponderosa Roemer 46 



Description 47 



t ieologic occurrence 47 



Localities 48 



Exogyra ponderosa var. erraticostata var. nov. 49 



Description 49 



Remarks 49 



Geologic occurrence 49 



Localities 50 



