17:
76:
87:
for many years before it again began to recede northward. Around 12,000 BCE the glacier began receding north of the
Valparaiso Moraine. The melt waters began to form a lake between the southern front of the glacier and the moraine, which acted as a dam. The water collected until it found a low spot
148:
valleys and can be from 6 miles (9.7 km) to 20 miles (32 km) from the lake. When the beach reaches10 miles (16 km) north of the
Muskegon River it returns to the shore of Lake Michigan. North of this area, the beach ridge has been eroded away. Near
270:
The
Pleistocene of Indiana and Michigan, History of the Great Lakes; Monographs of the United States Geological Survey, Vol LIII; Frank Leverett and Frank B. Taylor; Washington, D.C,; Government Printing Office; 1915; Chapter XIV, Glacial Lake Chicago, F.
48:. After the straits were freed, the lake receded and left behind a sand ridge at an elevation of about 640 feet (200 m) where the shore resided. This ridge can be seen clearly in Glenwood, Illinois,
140:. The beach reaches back more than 2 miles (3.2 km) from the modern shoreline while in other places, the modern lake as eroded the old beach shore. North of Holland it passes through the
100:
The
Glenwood beach is the highest of the Lake Chicago beaches. In the Wisconsin it lies close to the shore of Lake Michigan. To the north, it has been destroyed by
92:. Here, it topped the moraine and began cutting an outlet. At around 640 feet (200 m) above sea level, it stopped cutting downward and a stable lake formed.
302:
200:. It is visible on the northern bank from just north of I-80/90, southward across State Route 149. The largest area is just south of downtown
67:, are not visible along the northern part of the Lake Michigan. The readvance of ice lobe may have buried or eroded any northern remains.
83:
The
Michigan Lobe of the continental glacier had been growing and receding since 70,000 BCE. The glacier had been static along the
286:; Special Report 8; State of Indiana Department of Natural Resources; Geological Survey, John R. Hill, 1974
307:
178:
312:
233:
197:
141:
105:
196:
Leaving Lake County, the beach turns northward. The next visible area is along Salt Creek in
182:
101:
89:
53:
8:
218:
201:
190:
154:
150:
137:
129:
45:
41:
228:
166:
120:. From here south, the beach is further inland a nearly continuous around the city of
117:
84:
37:
213:
133:
64:
132:
and then north into
Michigan, where it follows the west edge of Covert Ridge into
186:
16:
223:
177:, the beach continues eastward from where U.S. 30 bends southward just east of
145:
296:
174:
170:
109:
49:
29:
33:
79:
Drawing of Lake
Chicago at the Glenwood Stage showing the Chicago area.
204:. It extends about 1 mile (1.6 km) east and west of Old SR 49.
113:
185:
it ends. The next segment can be found west of State Route 51 in
125:
121:
57:
75:
40:. The shoreline was formed when the lake was higher during the
63:
The two higher beaches of Lake
Chicago, the Glenwood and the
153:
it remains several miles from modern shore. Around
294:
266:
264:
262:
20:Glacial Lake Chicago at the Glenwood Shoreline
160:
279:
277:
28:is an ancient shoreline of the precursor to
259:
116:the remnants are broken, until the area of
274:
74:
15:
295:
303:Geological history of the Great Lakes
13:
284:The Indiana Dunes - Legacy of Sand
14:
324:
157:it is buried by a gravel plain.
36:. It is named after the town of
95:
246:
189:, along the southern flank of
70:
1:
239:
128:. It is continuous through
88:in the moraine, near modern
7:
207:
136:. The ridge is part of the
10:
329:
165:The beach name comes from
161:Where to see the shoreline
181:. Just north of downtown
44:, while ice blocked the
234:Kankakee Outwash Plain
80:
21:
90:Palos Hills, Illinois
78:
54:Schererville, Indiana
19:
252:Kenneth J. Schoon,
219:Tolleston Shoreline
202:Chesterton, Indiana
138:Lake Border Moraine
46:Straits of Mackinac
254:Calumet Beginnings
229:Valparaiso Moraine
167:Glenwood, Illinois
85:Valparaiso Moraine
81:
38:Glenwood, Illinois
26:Glenwood Shoreline
22:
308:Glacial landforms
214:Calumet Shoreline
112:. Southward into
320:
287:
281:
272:
268:
257:
250:
328:
327:
323:
322:
321:
319:
318:
317:
293:
292:
291:
290:
282:
275:
269:
260:
251:
247:
242:
210:
169:. Beginning in
163:
102:Lakes Nipissing
98:
73:
56:, all south of
12:
11:
5:
326:
316:
315:
310:
305:
289:
288:
273:
258:
244:
243:
241:
238:
237:
236:
231:
226:
224:Tinley Moraine
221:
216:
209:
206:
162:
159:
97:
94:
72:
69:
9:
6:
4:
3:
2:
325:
314:
313:Lake Michigan
311:
309:
306:
304:
301:
300:
298:
285:
280:
278:
267:
265:
263:
255:
249:
245:
235:
232:
230:
227:
225:
222:
220:
217:
215:
212:
211:
205:
203:
199:
198:Porter County
194:
192:
188:
184:
180:
176:
175:U.S. Route 30
172:
171:Dyer, Indiana
168:
158:
156:
152:
147:
143:
139:
135:
131:
127:
123:
119:
115:
111:
110:Lake Michigan
107:
103:
93:
91:
86:
77:
68:
66:
61:
59:
55:
51:
50:Dyer, Indiana
47:
43:
39:
35:
31:
30:Lake Michigan
27:
18:
283:
253:
248:
195:
183:Merrillville
164:
99:
96:Distribution
82:
62:
42:last ice age
34:Lake Chicago
25:
23:
108:and modern
71:Development
297:Categories
240:References
191:Deep River
130:Chesterton
155:Ludington
151:Pentwater
106:Algonquin
271:Leverett
208:See also
173:, along
146:Muskegon
118:Winnetka
114:Illinois
179:U.S. 41
134:Holland
126:Indiana
122:Chicago
65:Calumet
58:Chicago
256:, 2003
187:Hobart
52:, and
142:Grand
124:into
144:and
104:and
24:The
299::
276:^
261:^
193:.
60:.
32:,
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
_14000_BCE.jpg)
