Nebraska Department of Environmental Control, 301 Centennial Mall South, Lincoln, NE 68509, USA.
Palaeo-yardangs: wind-scoured desert landforms at the Permo-Triassic unconformity
Article first published online: 14 JUN 2006
Volume 39, Issue 2, pages 251–261, April 1992
How to Cite
TEWES, D. W. and LOOPE, D. B. (1992), Palaeo-yardangs: wind-scoured desert landforms at the Permo-Triassic unconformity. Sedimentology, 39: 251–261. doi: 10.1111/j.1365-3091.1992.tb01037.x
- Issue published online: 14 JUN 2006
- Article first published online: 14 JUN 2006
- (Manuscript received 13 February 1991; revision received 14 November 1991)
In Canyonlands National Park, south-east Utah, at least 29 partly exhumed, aligned sandstone ridges trending generally N20°W occur at the upper unconformable surface of the Lower Permian (Leonardian) White Rim Sandstone. The ridges are at least 1·5 km long, 250 m wide and have up to 14 m of vertical relief (mean of 9 m). A thin lag of coarse sandstone that contains wind-ripple laminae and granule ripples directly overlies the ridges. Angular blocks of sandstone within the lag and sand-filled fissures immediately below the lag, within the ridges, attest to early cementation of the ridge-forming material. SE-dipping aeolian cross-strata within the White Rim Sandstone and within the lag closely parallel the ridge trend. The ridges are interpreted as wind-sculpted desert landforms (yardangs) that developed on the lithified upper surface of the White Rim Sandstone during an extended period of hyperaridity towards the end of the Permian.