REPORT OF NATIONAL MUSEUM, 1919. Ill 



there are a number of gaps in the series, it is hoped they may shortly 

 be filled. 



Field explorations. — The principal expedition of the year was that 

 of Secretary Walcott during the field season of 1918 in the Canadian 

 Rockies of British Columbia and Alberta, with the object of find- 

 ing an Upper Cambrian fauna, and also ascertaining if there was 

 any considerable variation on the strike of the Cambrian formations 

 from the section along the Bow Valley northward. Nothing was 

 discovered of importance with relation to the Upper Cambrian fauna 

 and no material change found in the formations as far as the Sas- 

 katchewan River. A large number of photographs were taken, illus- 

 trating the stratigraphy and the scenery of the upper Bow Valley, 

 also the area in the vicinity of Wolverine Pass, about 30 miles south 

 of Lake Louise. 



Explorations for large objects to illustrate the various phases of 

 structural geology and stratigraphic paleontology were continued 

 during the summer of 1918 by Dr. R. S. Bassler, curator. Field 

 work was started in the Cretaceous and Tertiary rocks of New Jersey, 

 where glauconite, calcareous marl, and numerous fossils were ob- 

 tained. The Lancaster and Cumberland Valleys of Pennsylvania and 

 Maryland were then explored and several large specimens illustra- 

 ting folding and faulting and attendant phenomena were found. 

 The east front of the Alleghany Mountains of Maryland afforded 

 some very interesting blocks of fault breccia in which recementation 

 had occurred, in one case by silica and in another l^y iron ore. Exam- 

 ples of these were shipped to the Museum and are now ready for 

 exhibition. Following this work in the Appalachians, Doctor Bass- 

 ler spent some tim.e in Kentucky and Indiana locating exhibition 

 material and collecting fossils. The most important shipment from 

 this region was a layer of limestone so carved out by underground 

 water that it can be used to illustrate cave formation in miniature. 



Dr. E. O. Ulrich spent the field season of 1918 in stratigraphic 

 and paleontologic work on the Upper Cambrian rocks of the upper 

 Mississippi Valley. Important collections of fossils and several 

 large exhibition specimens resulted from his work. 



Distribution and exchcmge of specimens. — ^There have been pre- 

 pared and sent out from the department 385 specimens, in 8 lots as 

 gifts; 245 in 12 lots as exchanges; and 2,846 in 20 lots as loans for 

 study or to be consumed in scientific research. In addition, 6 sets 

 of invertebrate fossils, aggregating 281 specimens, have been dis-- 

 tributed to schools. _^-*--^t'''l-^-*'"' ' --^ — 



