38 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1922. 



valuable skeletal material, as has been the case for several years 

 past. The exploration of Pueblo Bonito in the Chaco Canyon, 

 N. Mex., by the National Geographic Society under the direction of 

 Mr. Xeil M. Judd during the summer of 1921 Avas largely prelimi- 

 nary. The exploration will be continued through a number of sea- 

 sons and the collections are to become the property of the National 

 Museum. 



Early in the year Mr. F. W. Foshag collected minerals from 

 interesting cave deposits in the Grand Canyon, near Supai, Ariz., 

 a project made possible through the courtesy of Mr. C. A, Heber- 

 lein, operating in the region. Mr. Foshag also made field trips to 

 southern California and Nevada in connection with research work 

 at the University of California, the results of which were likewise 

 added to the national collections. 



Doctor Bassler spent his vacation in July, 1921, in geological field- 

 w^ork in the central basin of Tennessee, under the auspices of the 

 Geological Survey of that State. The field oft'ered such opportunities 

 that arrangements were made for another summer's work in the 

 same general area. During the greater part of June, 1922, there- 

 fore Doctor Bassler, in company with Dr. E. O. Ulrich and Mr. 

 E. D. Messier, of the United States Geological Survey, was occupied 

 in making stratigraphic sections and collecting fossils over the en- 

 tire central basin, an area of about 8,000 square miles. The ultimate 

 object of this work is the preparation of a monograph on the 

 stratigraphy and paleontology of Tennessee. On the completion 

 of his Avork in Tennessee, in 1921, Doctor Bassler proceeded to 

 Springfield. 111., Avhere casts of type specimens in tlie State museum 

 collections Avere made, in accordance Avith the department's plan 

 to complete so far as possible the representation of type specimens 

 in the national collections. Through the courtesy of Mr. E. J. 

 Armstrong, of Erie, Pa., Doctor Bassler visited all the classical 

 Silurian and Devonian localities in nortliAAestern Pennsylvania and 

 western Ncav York during the latter part of September to obtain 

 field knoAvledge of the detailed geology and to collect carefully se- 

 lected sets of fossils illustrating the numerous formations of the 

 region. The Avork Avas highly successful, and the large collections 

 of Devonian fossils in the Museum concerning Avhich exact strati- 

 graphic data have been lacking can noAv be determined and arranged 

 in necessary detail. 



Dr. E. O. Ulrich, of the United States Geological SurAey, spent 

 the summer of 1921 in continuation of his field researches on the 

 early Paleozoic rocks of eastern North America, and previous to 

 joining Doctor Bassler in Tennessee, as noted aboA^e, studied the 

 Silurian stratigraphy of Pennsylvania and Maryland. Mr. N. H. 

 Boss made several short trips collecting in the Miocene deposits 



