400 PLEISTOCENE OF INDIANA AND MICHIGAN. 



Alpena, for when the lake fell to a level 20 feet lower than the Grassmere beach, the discharge 

 from the Lake Huron basin was southward to the Lake Erie basin. The marks of that dis- 

 charge are very plain. If the outlet of Lake Lundy had been northwestward to Lake Chicago 

 at the time of the Grassmere beach the waters would hardly have flowed south when the ice 

 front drew back far enough to let the lake level fall 20 feet lower. 



GRASSMERE AND LUNDY BEACHES. 



DISTRIBUTION. 

 MICHIGAN. 



Monroe and Wayne counties. — In Monroe County the Grassmere beach is not so strongly 

 developed nor so well defined as the Wayne beach. It often seems like a lower level of that 

 beach, especially where they stand close together. It starts at the State line about a mile east 

 of the Wayne beach which it closely parallels to Raisin River. Its altitude is about 640 to 645 

 feet. 



A separate, narrower sandy belt which runs northeast from the State line, passing a mile 

 or two east of Temperance and Yargerville, about 4 miles west of Monroe, 2 to 3 miles west of 

 Stein er and Grafton, and through Carle ton, is designated by Sherzer the Grassmere beach; but 

 its altitude is 615 to 620 feet, and it corresponds, therefore, quite clearly to the Lundy beach 

 farther north. 



The sandy belt representing this beach is considerably more scattered and patchy than 

 the sandy parts of the Grassmere, and it is not so strongly developed. As mapped by Sherzer 

 it enters the Romulus quadrangle in the northwest corner of Frenchtown Township as a sandy 

 belt about 2 miles wide. 



In this flat region only its general course can be indicated. In general, its axis lies 1 to 1^ 

 miles east of the 620-foot contour, passing out of the quadrangle about a mile east of Taylor. 

 For about 2 miles larther it runs northeast through the northwest comer of the Wyandotte 

 quadrangle and then northwest through the southwest corner of the Detroit quadrangle. It 

 here swings west about a mile into tbe Wayne quadrangle and passes a little west of Dearborn. 



In the Romulus quadrangle the Grassmere beach is very sandy and poorly defined. From 

 Ih miles west of Maybee its course is about north to Stony Creek, where it turns northeast to 

 New Boston. 



In the Wayne quadrangle the Grassmere beach is more diffuse and sandy. It passes 

 through Eloise (2£ miles east of Wayne) and a mile east of Livonia, and thence, keeping about 

 a mile south of the Wayne beach, into the Detroit quadrangle. For 2 or 3 miles south of Eloise 

 it is fairly well developed, but is generally merely an irregular and ill defined sandy belt. 



The Grassmere beach rounds the Detroit interlobate moraine in a much wider curve than the 

 Wayne. It passes eastward about a mile north of Howlett and turns north through Palmer 

 Park, the main ridge passing about 1J miles west of Highland Park. The sandy deposits at 

 Highland Park and for a mile or two southwest of there belong to this beach. From Palmer 

 Park the Grassmere passes a mile east of Royal Oak. From where it turns north the beach is 

 composed of fine sand, much wind blown, and is Very irregular and ill defined. 



Entering the Detroit quadrangle at Dearborn, the Lundy beach runs eastward through 

 the central part of Detroit. For some distance in the western part of the city it lies not far 

 south of Grand River Avenue, but continuing eastward it crosses to the north side and passes 

 about half a mile north of Grand Circus Park. In the eastern part of the city it lies mainly 

 about a mile back from the river and swings northward through Elmwood and Mount Elliott 

 cemeteries, running thence half a mile to a mile east of Gratiot Avenue. It keeps the same 

 course through the Grosse Pointe quadrangle but after crossing the county line lies nearer 

 Gratiot Avenue. 



Through the city this beach is simply a belt of low, scattered sandy knolls and fragmentary 

 ridges, few of which remain in the business section, though many persist in the residence parts 

 of the city and in the suburbs and in Elmwood and Mount Elliott cemeteries. 



