THE VALPARAISO MORAINIC SYSTEM. 341 



the west, but to extend the border between the lobes several miles to the 

 west. This border assumes a nearly east to west course, across Otsego and 

 Trowbridge townships. In the latter township it has the form of a double 

 ridge with only the Kalamazoo River between the two members. A till 

 plain fits closely about the border of the north member on the west and 

 north, which rises toward the morainic ridge, apparently indicating that the 

 Lake Michigan movement extended to this ridge. Similarly the south 

 member is bordered by a plain on the south and east, which rises toward 

 the ridge and indicates that it was formed by the Saginaw movement. 



The Saginaw movement apparently extended only to the western part 

 of Trowbridge Township, for the ridge on the south side of the Kalamazoo 

 River swings around on the west and south border of the till plain just 

 referred to. The double ridge, which in Otsego and Trowbridge townships 

 trends toward the west, here becomes combined into a single belt and 

 swings around through Cheshire Township to a southerly course. It pre- 

 sents sloping till plains on each side rising toward it. As the combined 

 morainic belt enters Van Buren County it again becomes separated. The 

 Saginaw moraine turns to the east, crossing the northern part of Pine 

 Grove Township, while the moraine of the Lake Michigan lobe bears 

 nearly due south through the eastern part of Bloomingdale Township. An 

 overwash gravel plain common to the two lobes, covering 5 or 6 square 

 miles, separates the two moraines in western Pine Grove Township, while 

 each moraine has a till plain fitting about its opposite border. In each case 

 the till plain rises toward the moraine which it borders. 



In the townships south of Bloomingdale and Pine Grove (Waverly 

 and Almena) both moraines are obscure near their line of junction, there 

 being instead an extensive swamp, which borders Pawpaw River and is 

 known as the Pawpaw Swamp, in which only occasional clusters of knolls 

 appear. The Lake Michigan movement apparently extended about to the 

 border between Waverly and Almena townships, for the till plain, which 

 farther north lies west of the eastern or outer member of the Lake Michi- 

 gan movement, extends about to this line and borders the swamp just 

 mentioned on the west. The Saginaw movement, which produced a bulky 

 moraine in Pine Grove Township, has scarcely any morainic features in 

 the township on the south. The till plain, which in Pine Grove Township 

 lies east of the prominent morainic ridge, continues southward along the 

 east border of the Pawpaw Swamp. 



