SCATTERED OCCURRENCES OF CRYSTALLINES 549 



"The possible occurrence of igneous rocks in Kansas, which are known to 

 me from personal observation, are at Silver City and near Rose, both in Wood- 

 son County. Each occurrence is associated with, and in each instance perhaps 

 related to, a dome or anticline which, for the eastern portion of Kansas, has 

 comparatively steep dips. 



"The anamorphosed sediments at Silver City are best explained by the oc- 

 currence of an igneous intrusion at no great distance beneath the surface. At 

 Rose the igneous rocks are at the surface and consist of granite blocks with 

 linear distribution. Holes drilled to the south of these blocks are not known 

 to have penetrated igneous rocks, although some of them were but a short 

 distance awaj'. ... I have made the interpretation that these granite 

 blocks may possibly have reached their present positions through deposition 

 from floating ice. Their marine distribution, the association with decided 

 doming of the strata, the reported occurrence of anamorphism, and the near- 

 ness to the occurrence at Silver City support the hypothesis that the Rose 

 granites represent an intrusion which may have occurred at the same time as 

 that at Silver City. If the latter be the correct interpretation, it is probable 

 that a well properly located would encounter similar granites at Silver City." 



BILEY COUNTY, KANSAS 



A single exposure of igneous rock in west central Eiley County, Kan- 

 sas, lias recently been described by Moore and Haynes.^° This exposure, 

 which lies about 20 miles northwest of Manhattan, is an outcrop of a 

 dark green rock, an igneous breccia, forming a low, domelike, grass- 

 covered mound with a maximum elevation of about 30 feet. The total 

 area of the mound is not more than one acre, and the weathered frag- 

 ments of the dark green rock were not found more than 100 feet beyond 

 the limits of the symmetrical mound. The conclusion is reached that 

 the mass is a rather small volcanic neck or pipe, of post-Permian age. 

 Mr. Howard Tomlinson, who studied the rock in this section, pronounces 

 it kimberlite or porphyritic peridotite. 



LAMAR. COLORADO 



In southern Prowers County, southeastern Colorado, there is an ex- 

 posure of igneous rock which Prof. E. D. George, in a personal com- 

 munication dated November 8, 1922, describes as follows': 



"South of Lamar there is a laccolithic area in the southeastern part of 

 township 27 south, range 46 west. The main part of the igneous area is in 

 section 35, but extends over into section 36, and, according to a new survey 

 made, may extend into sections 1 and 2 of township 2S south, range 46 west. 

 The rocks of the main laccolithic bodies are very basic syenitic types. . . . 

 Associated with the laccoliths are 50 or more dikes of various lengths and 

 touching the adjacent corners of the four townships. On one of these areas 

 is a body of porphyritic granite ... 100 yards long and 15 to 20 yards 



