BEPORT OF THE SECRETARY. 11 



which were found to be similar to tlie section at the head of Bow 

 Lake. 



The broad canyon valleys that unite the headwaters of the Sas- 

 katchewan River are all carved by erosion out of the same type of 

 Cambrian rocks as those exposed in the vicinity of Bow Lake, and 

 also in the Boav Valley south of Lake Louise Station. 



At the close of the season a fine pair of mountain sheep, a black 

 bear, one mule deer, a mountain goat, and a wolverine were collected, 

 the skins and skulls being shipped to the National Museum, 



GEOLOGICAL AVORK IN THE MIDDLE ATLANTIC STATES. 



During the field season of 1918 the members of the geological statf 

 were chiefly occupied in collecting material for the museum exhibi- 

 tion series, most of the work being done in Virginia, Maryland, New 

 Jersey, Pennsylvania, and New York. Sufficient material illustrat- 

 ing the weathering and decay of rocks was obtained by Dr. J. C. 

 Martin, assistant; curatoi- of geology, United States National 

 Museum, to nuike up 100 sets for distribution to those agricultural 

 and other colleges which give instruction in rock weathering and 

 soil formation. Dr. Martin also visited several localities in Penn- 

 sylvania, New Jersey, and New York for the purpose of filling cer- 

 tain gaps in the ore and rock collections. 



In continuance of the search begun in recent years for large ex- 

 hibition nmseum specimens to illustrate the various phases of struc- 

 tural geology and stratigraphic paleontology, Prs. Bassler and 

 Resser, of the division of paleontology, report as follows: 



Field work was begun with un investigation of tlie ('retaceous rocks of west- 

 ern New Jersey, where the prime object was to secure suitable exhibits of such 

 economically important rocks of organic origin as glauconite, or greensanci, 

 and calcareous marl. The greent and area in the vicinity of Vincentown, N. .1., 

 afforded the best results in fossil and rock specimens for both study and exhibi- 

 tion. The very incoherent greensand could not be obtained in m|isses of a size 

 suitable for exhibition, but by use of shellac a large piece was hardened suf- 

 tlciently to be shipped to Washington without breakage. In the marl pits 

 unusually well-preserved fossils wei"e found scattered through an unconsoli- 

 dated sand formation. Here specimens abound literally by the millions, and 

 large numbers were collected by passing quantities of the sand through a fine- 

 meshed .<ieve, the re.sidue in this jn'ocess usually consisting of nothing but well- 

 preserved fossils. 



They then proceeded to the Lancaster Valley of Pennsylvania, wliere they 

 were fortunate enough to secure intact a large mass of finely banded, crinkled 

 limestone. This illustrates, on a small scale, the folding to which the earth's 

 crust has been subjected, and forms a much-needed addition to the exhibits. 



On the east front of the Allegheny Mountains Dr. Bas-sler obtained exhibition 

 specimens illustrating faidtlng and its accompanying phenomena. In western 

 Maryland a fault passes through a Silurian conglomerate composed of small, 

 rounded pebbles of pure white quartz, forming an interesting educational ob- 



