Geology√

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Geology√

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Geology√

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Geology√

1974 Archival description results for Geology√

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Successive stages in the development of the Great Lakes

Great Lakes. Successive stages in the development of the Great Lakes, North America. a. An early stage (about 25,000 years ago) showing marginal lakes with an outlet near Chicago (C) into the Mississippi. b. The marginal ancestors of Lake Superior and Lake Michigan drain into the Mississippi. The eastern lakes drain into the Hudson River. E, Lake Erie; F, Finger Lakes od New York State; H, Lake Huron; M, Lake Michigan; S, Lake Superior. Holmes, 1953, p. 242. See also XII - 138

Sutures of three types of ammoniods straightened out

Ammonoids. Sutures of three types of ammoniods straightened out. The arrow points forward on the outside edge of the last whorl of the shell. Top, ammonite 'Pompeckjites' (triassic); middle, the ceratite 'Bugotites (Triassic); lower the goniatite 'Muensteroceras' (Mississippian). (After Clark and Stearn, 1960, p. 357).

Swift Current Creek section along north side of tributary

Swift Current Creek section along north side of tributary to Swift Current Creek in Sec. 10, T. 19, R. 13, W. 3 meridian. From bottom to top: Wymark Till (buff), Lower stratified drift (white band), Aikins Till (grey), Middle stratified drift (light buff), Leinan Till (dark buff). Depth of valley is about 150 feet. Tuesday September 13, 1960. Note: For general views see 45_14,15.

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