FOSSIL CYCADEAN TRUNKS FROM WYOMING 257 



tock hunting for others that were wholly buried and succeeded 

 in exhuming two or three more. All the specimens collected 

 by us were packed up by Mr. Charles Schuchert, who was with 

 the party and remained after I left, and these were shipped with 

 his other collections to the National Museum where they now 

 are. I have not had time to study them or to ascertain whether 

 they include any additional species to those described in this 

 paper, but as others are on their way and as there is a prospect 

 of more extensive excavation and the discovery of many more, 

 all this may be left for a future paper. 



The section of the Freezeout Hills immediately to the east of 

 the cycad bed and including the ledges formed by the stratum 

 in which they occur was carefully measured. It is a character- 

 istic section since it extends from the Red Beds at the bottom of 

 the valley to the Cretaceous which caps the hill and is supposed 

 to represent the Dakota group, although such an examination 

 of it as I was able to make led me to suspect that it is the equiv- 

 alent of the Lower Cretaceous of the Black Hills, possibly ex- 

 tending, in some places, to the true Dakota group of Meek and 

 Hayden. 



The following is the section : 



Lower Cretaceous capping the hill 50 feet. 



Base of Cretaceous to top of cycad bed 100 *' 



Thickness of cycad bed ' 10 " 



Bottom of cycad bed to top of Marine Jurassic 80 *' 



Thickness of Marine Jurassic to bottom of valley on Red 



Beds 115 ♦' 



Total exposure 355 '• 



This section leaves no doubt of the Jurassic age of the cycad 

 bed and at the same time fixes its position in the fresh water 

 Jurassic with sufficient exactness for all practical purposes. 



LABORATORY PREPARATION. 



The collection received from Professor Knight consisted of 

 83 specimens of cycads and three specimens of silicified wood. 

 The specimens of cycads bore the numbers 500.1 to 500.83, 

 and those of the wood 500.85 to 500.87, of the Museum of the 



