498 
Buell—Bowlder Trains. 
ened, stony till and kame-like gravel deposits, the former ap¬ 
pearing on the ridge surfaces and the latter spreading over the 
lower levels. This line of marginal deposits is traceable from 
the north line of Green county, near Belleville, southward 
across the western tributary valleys of the Sugar river to the 
divide between the Sugar and Pecatonica basins in northeast 
Stephenson county, Ill. The heaviest morainic development in 
this belt is on the east side of the river at Albany, Wis., where 
the stream cuts across the ridge, its present channel being 
formed while the main valley of the river was filled by the 
glacier itself. 
South of this are massive gravel ridges which pass over low 
cols into the broad valley drained by tributary streams cross¬ 
ing Decatur township. Crossing the center of this township 
are belts of gravel aggregating two or three miles wide and 
showing in well sections thirty feet of stratified drift. On the 
deeply cut ridge surface south of this valley a thinned margin 
of stony till appears continuing the formation across to the 
Pecatonica valley. Within this latter area, however, the sur¬ 
face is so deeply loess covered that this border is no longer 
traceable. 
North of the west branch of Sugar river the quartzites appear 
upon this margin only at rare intervals. Their first occurrence 
in relative abundance is in the gravel ridges in the south¬ 
west corner of Albany. On section 30, Albany, and sec¬ 
tions 1 and 2, Sylvester, from five to a dozen quartzite cob¬ 
bles were found in each of the several roadway sections upon 
surfaces of a few square rods area. The largest quartzite bowl¬ 
der observed outside of the Kettle moraine was found in this 
vicinity on section 7, Decatur. It is a gray block of Portland 
quartzite and measures on its exposed surface 6X3 feet. It is 
only partly uncovered, its thin drift envelop having been re¬ 
moved in the grading of the roadway. Fragments are scat¬ 
tered through the stratified drift in Decatur township and on 
the ridge surface in sections 25 and 36, Sylvester, several bowl- 
derets were noted in morainic ridges lying upon the steep slopes 
of the limestone underlaid areas. Numerous small fragments 
were found in drift sections in the next township south of De- 
