The Old Southward Train. 
497 
of a drift ridge in section 15, Roscoe, and several cobbles and 
pebbles found in the remaining townships. This whole area is 
heavily covered with the more recent drift brought hither by 
the southwestward glacial movement which explains the rare 
occurrence of these erratics from the ledge area to the north. 
The centre of this train crosses the west half of Rock and 
Winnebago counties. It has its most abundant distribution in 
the townships of Plymouth and Newark, midway be¬ 
tween Rock river and Sugar river valleys. In the latter 
township about twenty-five quartzite bowlders have been 
noted along the roadsides. These represent the amount upon a 
small fraction of the surface. They were found both on the sur¬ 
face and within the body of the drift and occur in like propor¬ 
tions in the stratified and unstratified deposits. The largest 
noted within this area is about two feet in diameter. The 
quartzite drift in this region was first observed by Dr. Cham¬ 
berlin in his earlier studies of glacial phenomena of southeast 
Wisconsin. It was described and mapped by him in the publica¬ 
tions upon the geology of Wisconsin, 7 but in subsequent refer¬ 
ences to the region in his studies of the general problem these 
remote occurrences of the local crystalline drift were disregarded 
because of uncertainty of identification. 
South of the state line a scattered and meager distribution 
has been traced across Winnebago county to the outer margin 
of the morainic border south of the Pecatonica valley, de¬ 
scribed in the preceding section. Its distribution is not de¬ 
fined by this belt as several fragments have been noted in a 
line of eskers, extending westward from this formation to the 
vicinity ot Freeport. A small fragment apparently of the same 
rock was obtained for the writer by Mr. Hershey of Freeport 
in the Leaf river valley eskers, several miles south of Free¬ 
port. This indicates a discharge of gravel-bearing waters 
across the divide at the southwest angle of the valley toward 
the Mississippi. 
The west margin of this bowlder train appears on the west 
side of the Sugar river basin, in Green county, Wis., and 
Stephenson, Ill. Its distribution coincides with a belt of thick- 
1 Geol. of Wis., Vol. II, p. 202. 
