68 Tne American Geologist. Jaiy, 1897 
The sandstone bikes of the Ute Pass, Colorado. Accord- 
ing to W. O. Crosby these dikes contain material derived 
largely or wholly, from the lower portion of the Potsdam sand- 
stone of the region. They accompany the Ute Pass fault. 
Lithologically they are like that sandstone, and not like the 
later sandstones. The fault itself was probably not complet- 
ed till post-Cretaceous time, but it may have been begun at a 
much earlier period. The Potsdam sand entered the coUat- 
teral fissures along the fault, because of its immediate super- 
position, and that relation also excluded the later sandstones. 
(Bui. Essex Inst., xxvn.) 
New York Academy of Sciences. Section of Geology, 
May 17th, 1897. The first paper of the evening was by Mr. 
D. H. Newland, entitled "Occurrences and Origin of the Ser- 
pentines near New York." 
Mr. Newland spoke of the occurrence of the serpentines in the vicin- 
ity of New York, and classified them according to origin into two prob- 
able divisions; one including those from New Rochelle .md Hoboken, 
possibly derived from metamorphosed igneous rocks, and second, those 
from other localities more probably derived from some form of sediment- 
ary rock. 
The second paper of the evening was by Prof. J. F. Kemp, 
entitled "Notes on Butte, Montana, audits Ore Deposits." 
Professor Kemp described the geological position of the copper and 
silver bearing ore rocks of Butte, and illustrated his talk with a number 
of lantern slides made from photographs in the region last summer. He 
spoke particularly of the geological succession exhiljited in the relation- 
ship of two forms of granite, an earlier basic and a later acidic, cut by 
later rhyolite flows. 
The third paper was by Prof. Kemp, entitled "Notes on the 
Geology of the Trail from Red Rock to and beyond Leesburg. 
Idaho.''' 
This paper brought forth the first account known of the geology of 
about 100 miles of the trail mentioned, where the rocks are very varied 
in character, but mostly early Cambrian quartzites, together with many 
igneous rocks including Tertiary rhyolites. The ore producing region 
is found in the valleys where the gravels are washed in some places by 
hydraulic force and some gold gained therefrom. 
The last paper of the evening was b}^ Prof. C. A. Doremus, 
and was illustrated by a series of specimens recently received 
from France from M. Moissan, representing certain of the met- 
als and carbides formed by the electric furnace. Some of 
these were very interesting geologically, because of their pe- 
culiar properties ; particularly the carbonates of aluminum, 
calcium and cerium, which latter, when treated with water, 
produce all the gaseous series from marsh gas to the heavier 
petroleum products. The specimens exhibited are for final 
placement in the National Museum in Washington, D. C. 
Richard E. Dodge, Secretary, 
