Discrimination of fluvial and eolian features on large ignimbrite sheets around La Pacana Caldera, Chile, using Landsat and SRTM-derived DEM

Distinct erosional progressions in the Medusae Fossae Formation, Mars, indicate contrasting environmental conditions

“…Moreover, studies of terrestrial yardangs have shown that yardang orientation strongly reflects wind direction (Bailey et al, 2007;de Silva et al, 2009). We therefore believe that the orientation of the yardangs can be used as a proxy for the dominant wind direction that formed them.…”

Wind Erosion in Drylands

“…In other areas, hybrid corridor forms develop that incorporate both water and wind erosion characteristics (McCauley, Breed and Grolier, 1977;Bailey et al, 2007); e.g. the troughs may retain a degree of sinuosity as a relict of their former status as a watercourse (McCauley, Breed and Grolier, 1977).…”

“…Yardangs are probably initiated during arid climatic phases when erosive winds, charged with sand, exploit the axial trends of pre-existing lineaments, most commonly relict fluvial dissection systems (Hörner, 1932;Blackwelder, 1934;Krinsley, 1970;McCauley, Breed and Grolier, 1977;Laity, 1994Laity, , 2009Brookes, 2001;Bailey et al, 2007;Al-Dousari et al, 2009;Bristow, Drake and Armitage, 2009), joint systems (Mainguet, 1970;Neev and Hall, 1992;Vincent and Kattan, 2006), as for instance in sandstones, or cooling cracks in volcanic deposits (Bailey et al, 2007). For yardangs of the Arabian Peninsula and the Lut Desert, Neev and Hall (1992) argue for tectonic influences, suggesting that the linear trends of yardangs, as well as their locations and patterns, are strongly influenced by pre-existing swarms of fractures.…”

“…Today's average rainfall is <10 mm, but the region has experienced wetter periods in the recent geologic past. Bailey et al (2007) use a classification system that assumes that relatively straight ridges are associated with wind erosion and sinuous channels with fluvial erosion. A range of features were found, marking the relative significance of wind and water according to location: (1) features dominantly eroded by fluvial processes, (2) fluvial channels with some aeolian modification, (3) complex forms, resulting from fluvial and aeolian erosion, and (4) forms that were dominantly formed by aeolian processes (Bailey et al, 2007).…”

Identifying Evidence for Explosive Volcanism on Mars Through Geomorphologic and Thermophysical Observations

“…Similar to accumulations of transverse aeolian ridges (aeolian bedforms; Bourke et al, 2003), bidirectional yardangs and faceted terrains usually appear to be thin (10's of meters) erosional deposits covering a preexisting surface, and not erosional remnants of that preexisting terrain . Faceted terrains described by Bailey et al, 2007). The pits formed from complex aeolian activity over uneven topography (blowouts).…”