EEPOET OF NATIONAL MUSEUM, 1922. 81 



parts of the anatomy of extinct animals is rare, and the collection, 

 displayed with skeletal remains of the northern mammoth, is of 

 general interest. 



Mention may also be made of two skulls of the small rhinoceros 

 Diceratherium cooki^ from Agate, Nebr., forming part of the col- 

 lection made by Doctor Gidley during the last fiscal year, and of a 

 new form added to the collection of extinct birds, a tarso-metatarsus 

 of Parapavo calif ornicus^ donated by the University of California. 



Five of the eight accessions in the section of paleobotany are of 

 unusual value, consisting almost entirely of type material or of rare 

 exhibition specimens. Two are transfers from the United States 

 Geological Survey and comprise the types described by Dr. F. H. 

 KnoAvlton from the Tertiary lake beds of southwest Colorado and 

 from the Green River formation of the same State. Tavo fine exhi- 

 bition slabs of fossil leaves from the Upper Cretaceous of Alberta, 

 Canada, were presented by the Royal Ontario Museum of Paleon- 

 tology, Toronto, while gifts from Prof. O. M. Ball, College Station, 

 Tex., contain t3'pe specimens and an exhibition block of fossil plants. 



Explorations. — Extensive field work has been limited wholly to 

 the division of paleontology. The head curator did a little work 

 on his own initiative while in Maine on a vacation, and Mr. Shan- 

 non was absent on a two-day trip with the Petrologists Club, of 

 Washington, to Port Deposit and Conowingo, Md., and Peach Bot- 

 tom, Pa., visiting a number of commercial granite, feldspar, talc, 

 and slate mines and quarries. Early in the year Assistant Curator 

 Foshag was detailed to collect minerals from interesting cave de- 

 posits in the Grand Canyon, near Supai, Ariz., a project made pos- 

 sible through the courtesy of C. A. Heberlein. operating in the 

 region. The results of his w^ork are noted in the accessions. In 

 connection with his research work at the University of California, 

 Mr. Foshag has made two field trips, covering areas in southern 

 California and Nevada. On both of these occasions he shipped the 

 results of his collecting to the Museum. 



The geological work done by Secretary Walcott in the Canadian 

 Rockies was in continuation of that of the field seasons of 1919 and 

 1920, and for the purpose of securing data on the pre-Devonian strata 

 of the Sawback range in Ranger Brook Canyon, and a reconnais- 

 sance of the pre-Devonian formations to the northwest as far as 

 the headwaters of the North Fork of the Saskatchewan River, 

 Alberta. A detailed stratigraphic section was studied and measured 

 of i^re-Devonian formations in Ranger Brook Canyon, also at Fossil 

 Mountain, 8.5 miles (13.6 kilometers) northeast of Lake Louise Sta- 

 tion on the Canadian Pacific Railway, where large collections of 

 fossils were made from the upper portion of the Lower Ozarkian 



17075—22 6 



