Encyclopedia of Planetary Landforms

2015 Edition
| Editors: Henrik Hargitai, Ákos Kereszturi

Ridge in Current Shadow

Reference work entry
DOI: https://doi.org/10.1007/978-1-4614-3134-3_531

Definition

Elevated sediment structure on the downflow side of small topographic obstacles.

Category

A type of  drift deposit, a type of  obstacle dune, inner part of a  current crescent.

Synonyms

Less Frequently used Synonyms

 Comet mark (defined as “obstacle marks with an erosional tail of considerable length relative to their width”) (Werner and Newton 1975);  Current shadow (Bishop 2011; Allen 1982);  Rat tail (cm-scale forms in subglacial meltwater scoured bedrock; Prest 1983);  Remnant rock ridge (Sharpe and Shaw 1989); (Bagnold 1954, p. 159);  Scour remnant ridge (e.g., in snow; Allen 1965);  Shadow ridge (Hesp 1981).

Description

Elongated triangular-shaped aeolian deposit in the lee side of topographic obstacles, in which the apex is oriented downwind (Greeley et al. 2006; Blake et al. 2013), produced by accumulated material that may form elevated structure, or a plain that differs only in albedo from its surroundings.

Formation...

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References

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  3. Bagnold RA (1954) The Physics of Blown Sand and Desert Dunes. London: Methuen, 265P.Google Scholar
  4. Bish DL, Blake DF, Vaniman DT, Chipera SJ, Morris RV, Ming DW, Treiman AH, Sarrazin P, Morrison SM, Downs RT, Achilles CN, Yen AS, Bristow TF, Crisp JA, Morookian JM, Farmer JD, Rampe EB, Stolper EM, Spanovich N, MSL Science Team (2013) X-ray diffraction results from Mars science laboratory: mineralogy of rocknest at Gale crater. Science 341. doi:10.1126/science.1238932Google Scholar
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  10. Greeley R et al (2006) Gusev crater: wind-related features and processes observed by the Mars exploration rover spirit. J Geophys Res 111, E02S09. doi:10.1029/2005JE002491Google Scholar
  11. Hesp PA (1981) The formation of shadow dunes. J Sediment Petrol 51:101–112Google Scholar
  12. Leshin LA, Mahaffy PR, Webster CR, Cabane M, Coll P, Conrad PG, Archer PD, Atreya SK, Brunner AE, Buch A, Eigenborde JL, Flesch GJ, Franz HB, Freissinet C, Glavin DP, McAdam AC, Miller KE, Ming DW, Morris RV, Navarro-Gonzalez R, Niles PB, Owen T, Pepin RO, Squyres S, Steele A, Stern JC, Summons RE, Summer DY, Sutter B, Szopa C, Teinturier S, Trainer MG, Wray JJ, Grotzinger JP, MSL Science Team (2013) Volatile, isotope, and organic analysis of Martian fines with the Mars Curiosity rover. Science 341. doi:10.1126/science.1238937Google Scholar
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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  1. 1.NASA Ames Research Center/NPPMoffett FieldUSA
  2. 2.Division of Earth and Ecosystem SciencesDesert Research InstituteRenoUSA