Geology√

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Geology√

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Geology√

1974 Archival description results for Geology√

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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).

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

Submarine canyons

Submarine canyons. A. The hypothetical termination od a submarine canyon part way down the continental slope. B. The actual relationship of the submarine canyons to the continental slope with valleys continuing beyond the excavated portion of the canyon down the floor of the deep-fan. Shepard, 1960, p. 154.

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