Physical features of the Des Plaines Valley . Fig. 11. Two stages of the glacial lakes Chicago and Mauniee. (Leverett andTaylor.) The first might represent conditions in the Glenwood stage; the secondin the Calumet stage. Notice the expansion of the lakes northward as the borderof the ice receded, and the shifting of the outlet of Lake Maumee from FortWayne to the Grand river, as the lower pass was uncovered by the ice. 54 THE DES PLAINES VALLEY. [bull. no. U waters would be likely to maintain a tiat-Hoored valley. With the de-velopment of Lake Chicago at the head of this valley, the character
Physical features of the Des Plaines Valley . Fig. 11. Two stages of the glacial lakes Chicago and Mauniee. (Leverett andTaylor.) The first might represent conditions in the Glenwood stage; the secondin the Calumet stage. Notice the expansion of the lakes northward as the borderof the ice receded, and the shifting of the outlet of Lake Maumee from FortWayne to the Grand river, as the lower pass was uncovered by the ice. 54 THE DES PLAINES VALLEY. [bull. no. U waters would be likely to maintain a tiat-Hoored valley. With the de-velopment of Lake Chicago at the head of this valley, the characterof the river was completely changed. The over-abundant supply ofwaste from the melting ice was iioav carried into the lake and left river was thus relieved of its load, while suffering no diminution ofvolume, so it at once began to gather up the gravels it had previouslylaid down and thu? to re-excavate the valley. A\hile Lake Chicago was extending itself northward, as the edge ofthe ice retreated (Fig 11) its outlet was cutting a
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