Pg. 89, footnote; and M.M. Leighton, 1932, 16th Intl. Geol. Cong. Gdbk., no. 26, p. 16, 51, pl. 2. Manhattan ridge (also Manhattan moraine). Present in Joliet quadrangle, northeastern Illinois. Age is Pleistocene (late Wisconsin).
Source: US geologic names lexicon (USGS Bull. 896, p. 1280).
Pg. 12 (fig. 4). Manhattan drift. Shown on columnar section of Pleistocene deposits as Manhattan-Rockdale drift. Occurs below Valparaiso drift and above Minooka drift. Age is Pleistocene (Wisconsin).
Tills present in Joliet area, northern Illinois.
Source: US geologic names lexicon (USGS Bull. 1200, p. 2349).
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
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