REPORT OF THE SHCRETARY. y 
which were found to be similar to the 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 Bow 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 WORK IN THE MIDDLE ATLANTIC STATES. 
During the field season of 1918 the members of the geological staff 
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 curator of geology, United States National 
Museum, to make 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 museum specimens to illustrate the various phases of struc- 
tural geology and stratigraphic paleontology, Drs. Bassler and 
Resser, of the division of paleontology, report as follows: 
Field work was begun with an investigation of the Cretaceous 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 greensand, 
and calcareous marl. The greensand area in the vicinity of Vincentown, N. J., 
afforded the best results in fossil and rock specimens for both study and exhibi- 
tion, The very incoherent greensand could not be obtained in masses of a size 
suitable for exhibition, but by use of shellac a large piece was hardened suf- 
ficiently to be shipped to Washington without breakage. In the marl pits 
unusually well-preserved fossils were 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 sieve, the residue in this process usually consisting of nothing but well- 
preserved fossils. 
They then proceeded to the Lancaster Valley of Pennsylvania, where 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 
erust has been subjected, and forms a much-needed addition to the exhibits. 
On the east front of the Allegheny Mountains Dr. Bassler obtained exhibition 
specimens illustrating faulting 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- 
ject, and along the fault zone the conglomerate has been broken into angular 
