NO. 2 SMITHSONIAN EXPLORATIONS, I924 I9 



Lillydale quadrangle was of particular interest in that the basal beds 

 afforded a splendid fauna of crinoids many of which are new to 

 science. One of these new species, named in honor of the eminent 

 specialist, Dr. Frank Springer, is illustrated herewith (fig. 26). 



GEOLOGICAL FIELD-WORK IN THE ROCKY MOUNTAINS 



During August and September, 1924, Dr. Charles E. Resser, 

 associate curator of paleontology, U. S. National Museum, under the 

 direction of Secretary Charles D. Walcott, continued the study of the 

 Cambrian formations in the Rocky Mountains, using the Ford truck 

 and camp equipment purchased the previous season. He was accom- 

 panied and ably assisted by Mr. Robert S. Bassler, of Washington, 

 D. C. 



At the invitation of Prof. L. A. Keyte, Colorado College, Colorado 

 Springs, Colorado, the first stop was at that place and several days 

 were spent studying the lower Paleozoic beds along the Rocky Moun- 

 tain front. Under Professor Keyte's guidance and with his automo- 

 bile, no delay was experienced in locating fossiliferous outcrops and 

 securing good collections. During the past few years this region has 

 yielded many very excellent Ozarkian fossils, new to our study series. 



Work was continued in Logan Canyon, Utah, to ascertain whether 

 any beds of Ozarkian age, which occur 30 miles to the south in Black- 

 smith Fork Canyon, outcrop at this place. A snowstorm prevented 

 the completion of this task the previous September, but this year it 

 was found that the lower beds sought are not present. 



Camp was then moved by rapid stages to the Cooke City Ranger 

 station in the extreme northeastern corner of Yellowstone National 

 Park. A most excellent section exposing most of the Cambrian for- 

 mation present in this part of the Rocky Mountains (Absaroka Moun- 

 tains) was measured up Republic Creek, south of Cooke City, 

 Montana. Cooke City is a small community which came into existence 

 upon the discovery of silver ores in the surrounding mountains. It 

 can be reached by only one road which enters the Yellowstone Park 

 at Gardner, Montana, and branches off of the " Loop System " of 

 roads at Camp Roosevelt, following first the Lamar River past the 

 Buffalo Ranch, and then up Soda Butte Creek, a total distance of 

 more than 70 miles. On all other sides high mountains hem it in and 

 since the ores have never proven rich enough to compensate for the 

 town's isolation, the mines are undeveloped and the population is 

 sparse. The road to Cooke City traverses the best of the mountain 



