96 PROCEEDINGS OF THE AMHERST MEETING 



Reference may be briefly made to a rock-scarp that was formed along the 

 lower slope of the Sonoma range in Nevada at the time of an earthquake in 

 1915. The face of the scarp, which may be regarded as the visible surface 

 part of the fault-plane by which the mountain mass is believed to be bounded 

 and on which it is supposed to have been uplifted, seems to have a slope of 

 50 degrees at least, and movement on such a surface would partake more of 

 vertical upheaval than of horizontal extension. If scarps of this kind occur 

 elsewhere, and if landslides of the Canyon-range type are discovered to be less 

 exceptional than would today seem to be the case, then it may be permissible 

 to return more to Gilbert's early conception of the origin of the Basin ranges. 



Whatever the hade of the mountain-block fault-planes is found to be near 

 the mountain base, it is probable that it was steepest where it reached the land 

 surface before the mountain blocks were displaced, and that it is less steep 

 at a considerable depth below the present surface ; in other words, that the 

 fault-'*plane" is a curved surface, concave to the downthrow. This opinion 

 is based in part on a principle announced by McGee. 7 The total surface on 

 which a landslide moved should also be concave, or steeper above than below. 

 Hence, even if the fault-planes are fairly steep, they should still involve some 

 horizontal extension in connection with their nearly vertical displacements, 

 and even a limited measure of horizontal extension would be aided by an 

 underdrag of some such kind as above suggested. 



GENERAL MORPHOLOGIC FEATURES OF BASIN RANGE FAULTS 

 BY GEORGE D. LOUDERBACK 



(Abstract) 



A general presentation of the morphologic features as observed in the field 

 and related to their immediate origin, with particular reference to the follow- 

 ing topics : size of blocks, rotation, distribution of frontal displacements, cross- 

 faulting, longitudinal variation, and the occurrence of internal faults. 



Read from manuscript. 



Discussed by H. G. Ferguson and H. F. Eeid. 



BURIED GRANITE IN KAXSAS 

 BY RAYMOND C MOORE 



(Abstract) 



Following the discovery of very productive deep oil sands in Butler County, 

 south central Kansas, in 1915 and 1916, and of oil-producing horizons within 

 and below the Mississippian. in southeastern Kansas and northeastern Okla- 

 homa, many deep wells have been drilled in various parts of the State. Ap- 

 proximately forty of these wells, up to the present time, have reached crystal- 

 line rocks, chiefly granite. A few of the "granite wells" are found in the east- 

 ern part of the State, but most of them are grouped in a line or narrow zone 

 which extends from Pawnee County, in southeastern Nebraska, south-south- 



7 On the origin and hade <»f normal faults. Amer. Journ. Sci., xxvi, 1SS3, pp. 204-298. 



