Abstract

Introduction

For the American Museum I have been continuously engaged since June, 1900, in the exploration of the geology, flora, and fauna of three great formations which in their animal and plant life bridge over the passage from Cretaceous to Eocene time, as determined by comparison with the life of the same epochs in Europe. I propose to compare these formations with each other and with the typical Lance Creek formation of Wyoming. These formations are:

 Years 
Hell Creek formation of northern Montana 1902–1909 
Series embracing in descending order Paskapoo, Edmonton, Fort Pierre (upper), Belly River (intercalation). Fort Pierre (upper) of Red Deer River, Alberta 1909–1913 
Ojo Alamo formation of northern New Mexico 1904 
Lance Creek formation of Converse County, Wyoming 1900–1901 
 Years 
Hell Creek formation of northern Montana 1902–1909 
Series embracing in descending order Paskapoo, Edmonton, Fort Pierre (upper), Belly River (intercalation). Fort Pierre (upper) of Red Deer River, Alberta 1909–1913 
Ojo Alamo formation of northern New Mexico 1904 
Lance Creek formation of Converse County, Wyoming 1900–1901 

I have determined the geologic sequence in each of these formations and the succession of the species of reptiles. The mammals have been determined with . . .

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