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Pendant flood bar downstream of Steamboat Rock

View on map:47.855165°N 119.142499°W

Comments

"This giant pendant flood bar, composed vastly of the yellow-white silt of the Nespelem/Steamboat Formation, more commonly known as the white-yellow silt of Glacial Lake Columbia, would probably have been placed here sometime after the Grand Coulee head was breached ~15.6kya, with smaller =flood pulses and lacustrine modifications made aftewards." (see reference).

Description

A pendant bar is a fluvial geomorphology term that is usually applied to large landforms created by large scale flooding events. Pendant bars are thin, sharp-crested deposits, and are typically made up of coarser sediment from the bed load. This type of bar is found on the downstream side of a weathering-resistant protrusion such as a large outcrop of bedrock, and is separated from the protrusion by a depression.[2]

References

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