592 GLACIAL FORMATIONS OF ERIE AND OHIO BASINS. 



variations are perhaps to be expected in the part of the moraine which was 

 formed near the lake level. 



In the land-laid part of the moraine from near Findlay eastward occa- 

 sional sharp gravelly knolls occur, and also a few short esker ridges, as 

 already indicated, but they do not constitute a conspicuous feature. 



The surface bowlders, as in other moraines of this region, are chiefly 

 crystalline rocks of Canadian derivation, but Paleozoic rocks are also repre- 

 sented. Some of the rocks and minerals are of such restricted outcrop that 

 their sources may be determined, notably the red jasper conglomerates, 

 copper nuggets, and certain limestones. 



Red jasper conglomerates have been found on the spur of the Defiance 

 moraine south of Norwalk, and copper near Medina, both of which are 

 thought to indicate that there has been an ice movement in a course east of 

 south from the north shore of Georgian Bay and the eastern end of Lake 

 Superior. This being true, the movement is out of harmony with the later 

 movements of the ice sheet in northern Ohio, which, as shown by moraines 

 and striae, were southwestward. A fine specimen of the red jasper con- 

 glomerate is to be seen in the yard in front of F. Parrott's residence, in the 

 northwest part of Fairfield Township, about 8 miles south of Norwalk. It 

 was found by Mr. Parrott near the line of Peru and Bronson townships, a 

 mile or more south of Macksville. It is 3 or 4 feet in diameter and well 

 rounded. One-half is an almost solid mass of pebbles, whose size i-anges 

 from one-half inch up to 2 inches or more. The majority are semitrans- 

 parent quartz, but red and blue jasper pebbles are not rare. The other 

 half of the rock is nearly free from pebbles, being a coarse-grained quartzite 

 with a faint pink tinge. The pebbles are so firmly cemented that they are 

 in some cases more easily fractured than torn loose from their mati'ix. 

 Bowlders of this class are not rare over the portion of Ohio lying west of 

 a line connecting Brownhelm, Norwalk, and Mansfield, but are very rare 

 farther east. 



The limestone bowlders in Northampton Township, Summit County, 

 which Newberry thinks were derived from the islands of Lake Erie^ lie 

 in this moraine, but those observed near Talmadge lie in an earlier moraine 

 It is quite probable that these limestones and also the red jasper con- 

 glomerates and other bowlders derived from the north or northwest were 



1 Geology of Ohio, Vol. I, 1873, p. 206. 



