ICE WORK IN SOUTHEASTERN MICHIGAN 201 
Moraines—The moraines of the region mapped belong to 
the Huron-Erie series, and have a northeast and southwest 
direction. The most easterly and youngest is a water-laid 
moraine consisting of continuous and very symmetrical till 
ridges from five to twenty feet in height. They make their 
appearance between Wyandotte and Trenton, swinging in from 
the islands of the river, and they may be followed southward to 
within a mile of the Huron River. South of the river the 
moraine is indicated only by an unusual bunching of cobble- 
stones to the east and southeast of Newport. In the vicinity of 
Brest there is a suggestion of morainic topography, the ridges 
running eastward into the lake and apparently marking the 
southern limit of this moraine. This is probably Taylor’s 
Detroit moraine,’ although it has not yet been followed into 
Ontario. The Defiance moraine lies just west of the Upper 
Maumee beach, the position of which it determined in this 
region. It is a relatively narrow moraine of comparatively weak 
expression, containing low knobs of sand and gravel, some of 
which were submerged by glacial Lake Maumee. Westward, 
the members of the Huron-Erie series become more and more 
massive, and so crowded that they cannot with certainty be dis- 
tinguished from one another. Between them lie outwash gravel 
plains and ancient drainage channels, through which the water 
from the ice escaped to the west. 
ICE ACTION IN WAYNE COUNTY. 
Late Wisconsin.— Although there are rock exposures upon 
the islands of the Detroit River and near Gibraltar, still the 
surface of the waterlime dolomite is so much weathered that the 
strie are entirely obliterated. Undoubtedly they are preserved 
under the heavier covering of till, but these portions of the 
rock-surface have not yet been exposed. The most favorable 
locality in the county for the study of glaciated rock is at the 
extensive Sibley quarry, operated by Church & Co., one mile 
north of Trenton, and about fourteen miles south of Detroit.? 
1 Jour. GEOL., Vol. V, No. 5, 1897, p. 423. 
? The station “Sibley’s”” may be reached from either Detroit or Toledo very con- 
veniently by either steam or electric cars. 
