118 PLEISTOCENE OP INDIANA AND MICHIGAN. 



miles. These bowlders are probably a residue left where the drift has been cut away by the 

 river. 



STRIffi IN THE INNER BORDER. 



Strise have been observed at five localities within the boundaries of the intermorainic 

 tract. Exposures of rock strata are few and there is little opportunity for observation. 



In a few places in a quarry south of and near White River about a mile below Anderson a 

 flinty layer upon which strise appear caps a shale that forms the greater part of the surface rock. 

 The strise bear from clue south to S. 10° W. (magnetic). 



Strise were observed upon ledges in the north part of Free's quarry on the north side of a 

 small stream in the southwest part of Alexandria, where the surface rock is a thick-bedded blue 

 limestone which dips very gently west (about 1 foot in 150 feet). The surface is planed and on 

 it shallow grooves one-fourth inch or less in breadth bear S. 39° W. (magnetic). The strise 

 near Anderson are in harmony with the trend of the esker and its trough, but those at Alexandria 

 are not. 



Strise are found at the quarries south of Kokomo, on a small tributary of Wildcat Creek and 

 just east of the Pittsburgh, Cincinnati, Chicago & St. Louis Railway. The rock here is a thin- 

 bedded blue limestone, and the marks appear over the whole of the uncovered surface, comprising 

 an area of several square rods. Most of them are fine lines, only 1 to 4 inches in length, the 

 majority of which bear S. 50° to 70° W., but a few scattered ones bear from S. 20° E. to S. 80° W. 

 The great difference is perhaps due to a changing series of ice currents, the locality being directly 

 in front of the great curve in the drift belt, where the north-south trend in Hamilton and Tipton 

 counties changes to east-west trend in Clinton County. Currents of ice in Howard County 

 might pass southward against the western limb of the White River portion of the great drift 

 belt or southwestward against the eastern limb of the Wabash River portion. 



At the Davis bridge on Eel River northeast of Logansport the rocky bed of the river displays 

 glacial groovings which bear S. 58° W. and some of which are several yards in length. The 

 largest are 2 inches or more in width and one-third inch in depth. At the western end some of 

 the grooves terminate abruptly at flinty places in the rock. Tapering projections in the lee of 

 flinty prominences evidently owe their preservation to protection against the westward-moving 

 ice. To this feature Chamberlin has applied the name "knob and trail." i 



Glacial grooves and strise were observed within the city limits of Logansport on the north 

 bank of Eel River just below the upper dam, on a rocky ledge a few feet above the level of the 

 river, where nearly all of a magnificent series bear S. 14° E. (magnetic). All the grooves have 

 this bearing, but some of the strise or fine lines bear more nearly south, the most southerly being 

 S. 5° E. A careful search was made for evidence on the surface that would be decisive concern- 

 ing the direction of ice movement, for it seems not unlikely that the moraine north of the river 

 might have been formed in part by a lobe spreading northward, but nothing satisfactory was 

 discovered for there are no prominent flinty knobs such as occur in the exposure in Eel River. 

 Some light scratches which cross the grooves with a bearing S. 70° W., or in about the direction 

 of the flow of Eel River, look in places much like glacial strise, but they may have been 

 formed by river ice. They appear only on the prominent parts of the rock surface and are 

 very light and but a few inches in length. 



GLACIAL DRAINAGE. 



OUTER BORDER. 

 WHITEWATER RIVER BASIN. 



East and West Whitewater rivers and some of their principal tributaries in Wayne County 

 bear gravel plains which show that they were occupied by streams that flowed southward from 

 the margin of the ice sheet while it was forming the moraines of northern Wayne and southern 

 Randolph counties. These gravel plains constitute the terraces of the Whitewater and may 



1 Seventh Ann. Rept. U. S. Geol. Survey, 1888, p. 246. 



