Swash mark and grain flow
Journal of Sedimentary Petrology
By: Sallenger Jr.
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Abstract
Swash marks composed entirely of coarse sand are commonly found on coarse-sand beaches. These swash marks are 10 to 30 centimeters in width and a few millimeters to one centimeter in height. Previous observations, mostly on finer-sand beaches, indicate swash marks are seldom over a few millimeters in height and are commonly composed of material readily floated by surface tension (e.g., mica flakes and shell fragments). Swash marks composed of coarse sand have both fining seaward and fining with depth trends in grain size. Apparently, the leading margin of a wave upwash drives a highly concentrated flow of grains in which both grain size and grain velocity decrease with depth. Therefore, large grains are transported at greater velocities than are smaller grains. Thus, at the maximum advance of an upwash, a swash mark is deposited which has the observed fining seaward and fining with depth trends in grain size.
Suggested Citation
Sallenger, 1981, Swash mark and grain flow: Journal of Sedimentary Petrology, v. 51, no. 1, p. 261-264, https://doi.org/10.1306/212F7C61-2B24-11D7-8648000102C1865D.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Swash mark and grain flow |
| Series title | Journal of Sedimentary Petrology |
| DOI | 10.1306/212F7C61-2B24-11D7-8648000102C1865D |
| Volume | 51 |
| Issue | 1 |
| Year Published | 1981 |
| Language | English |
| Publisher | SEPM |
| Contributing office(s) | Coastal and Marine Geology Program |
| Description | 4 p. |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Journal of Sedimentary Petrology |
| First page | 261 |
| Last page | 264 |