12 Eeport of the State Geologist. 



at Little Falls, gives rise to one of the most striking features 

 in the scenery of the Mohawk Valley. 



Two faults of small throw and not great extent on the East 

 Canada Creek, recorded by Yanuxem, are re described. The 

 writer finds, that of two previously described dislocations at St. 

 Johnsville, one branches and curves in a remarkable manner. 

 The great uplift at the "Noses," just east of Canajoharie, gives 

 rise to a great ridge of calciferous sandrock rising abruptly from 

 the moderately elevated Utica slate region on the east. The faults 

 at Fonda and Tribes Hill bring up the limestones of the Trenton 

 group, but appear to be neither very profound nor of great 

 extent. The Broadalbin fault is not very clearly pronounced ; 

 that at Hoffman's Ferry is the easternmost in the region and 

 brings up the Calciferous, Birdseye and Trenton limestones over a 

 wide area, extending up the river as far as Amsterdam. 



The faults at Saratoga are of much interest, as it was long 

 ago recognized that the mineral springs at this place issue along 

 a line of dislocation which brings up the Calciferous sandrock to 

 a moderate altitude above the plains to the eastward. One of 

 these faults extends to the Lake George region. 



These descriptions recount all attendant phenomena and are 

 illustrated with twelve figures, two plates and a map. 



Geology of Seneca County. 



In continuation of the plan of county surveys I communicate 

 the accompanying report on the structural and economic geology 

 of Seneca county by Dr. D. F. Lincoln. The subject is covered 

 under three general divisions : 1. Surface Geology ; 2. Strati- 

 graphic Geology; 3. Economic Geology. Under the first head 

 are given detailed accounts of the topography and also of super, 

 ficial accumulations, their nature and distribution. LTnder the 

 latter are notices of the general character of the plateau, hills, 

 ravines; of the alluvial belt, drumlin belt, sand ridges, karae 

 district, delta deposits, old channels, glacial deposits and striation, 

 springs, etc." 



The stratigraphic geology considers each formation in succes- 

 sion, from the Salina beds to the Portage group of rocks, 

 the highest in the county. The local development and vari- 

 ation of each is given with fulness and precision. Faunal char- 



