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Kupsch, Walter Oscar Geology√
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Tunnel valley.

Tunnel valley. 1. Moraine landscape. 2. Tunnel valley. a. Main valley. b. Lateral valley. c. Lake basins. d. Lagoon of liman type. e. Bay; the sea-transgressed part of the valley. 3. Post-glacial erosion valley. f. River valley eroded in the bottom of the tunnel valley. 4. Isthmus built in spit growth. g. Oldest southerly spit. h. Oldest northerly spit. 5. Barred foreland. Source: Atlas of Denmark.

Topography off the outer Mississippi delta

Topography off the outer Mississippi delta, 1940. Small landslide gullies move forward with the advance of the Mississippi Delta over the continental slope. They do not extend down the slope deeper than 200 feet. Shepard, 1960, p. 133.

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