STRI^ OF THE MIAMI LOBE. 327 



Other interesting observations on the drift formations are reported by 

 Phiminer in equally graphic manner. They relate to the occurrence of 

 silts containing blue spots thought to be " tanno-gallate of iron," from 

 which he made an ink ; also to organic remains in the di'ift, and to the 

 number and kinds of bowlders on the surface. 



The following observations of striae in Indiana are recorded in the 

 State geological reports for 1859 and 1878 : On page 43 of the earlier 

 report, striae near Cambridge in a quarry in NE. ^ of sec. 33, T. 16 N., 

 R. 12 E., about a mile west of Whitewater River, are said to have a 

 bearing from north of northeast to south of southwest. In the later report 

 (pp. 184-185), strise at the falls of the west fork of East Whitewater, near 

 the locality noted by Plummer, north of Richmond, have a bearing of 

 S. 40° W. Strise in the bed of Nolands Fork, near Centerville (p. 215 of 

 same report), bear slightly west of south. 



In Butler County, Ohio, striae, whose bearing is nearly north to south, "■ 

 were observed by G. F. Wright about 4 miles east of Hamilton on the 

 southeast bluff of the Grreat Miami. Concerning these striae Wright 

 remarks : 



These are of additional interest as showing the degree to which the ice move- 

 ment at this point was independent of the local topography. The strife here observed 

 were upon the south side of the Miami River (whose general course is here northeast 

 and southwest), and 75 feet above low-water mark. The direction of the striae is 

 diagonal to that of the valley, which is here a mile or moi-e in width, but nearl}' at 

 right angles to the general course of the glacial boundaiy, about 20 miles to the south. 



Orton personally mentioned to tlie writer that he had observed striae 

 on the uplaiids northeast of Oxford which have a bearing nearly south. 



About 3 miles southwest of Middletown, on the west bluff of the Great 

 Miami, is a glaciated exposure in which the striae bear S. 8° E. (magnetic). 



In Warren County, Ohio, about 3 miles northeast of Springport, on 

 elevated uplands at Brown's quarry, striae bear S. 48° E. (magnetic). 



Three miles west of Waynesville the bearing is S. 48° E., while 3 

 miles northwest, near the village of Lytle, the bearing is S. 70° E. 



Orton's map, opposite page 413, Vol. I, Geology of Ohio, indicates 

 striae in the vicinity of Lytle bearing S. 66° E. and S. 54° E., while near 

 Centerville the map shows striae bearing S. 80° E. In the vicinity of 

 Yellow Springs and Springfield, and below Springfield, along Mad River 



' See Bull. U. S. Geol. Survey No. 58, 1890, pp. 41-42. 



