Origin, sedimentary features, and significance of low-angle eolian "sand sheet" deposits, Great Sand Dunes National Monument and vicinity, Colorado

Sand sheet dynamics and Quaternary landscape evolution of the Selima Sand Sheet, southern Egypt

“…The area studied here differs greatly from the North American sand sheets and interdune deposits whose descriptions are prevalent in the literature (Folk, 1968;Fryberger et al, 1979;Kocurek and Nielson, 1986;Nielson and Kocurek, 1987;Kocurek et al, 1992) due to its size, setting, longevity, climate and widespread lack of relief. Typical interdune deposits within dune fields may cover a few thousand square meters, versus the tens of thousands of kilometers in southern Egypt.…”

“…Individual granules form compact surface lags of one grain thickness. As pointed out by Breed et al (1987) the Saharan sand sheets differ from sand sheets of North America in having essentially horizontal planar laminations (type "b" laminae of Fryberger et al, 1979) as opposed to low angle laminae in American deserts (type "a" laminae).…”

Eolian sedimentation and soil development on a semiarid to subhumid grassland, Tertiary Ogallala and Quaternary Blackwater Draw formations, Texas and New Mexico High Plains

“…However, most of these sediments, which have a median diameter of 4.0 (0.063 mm) (very fine sand), are coarser than loess, which has a median diameter of 5 to 6 (0.031 to 0.016 mm) (medium to coarse silt) (Péwé 1981;Miller et al 1984). Furthermore, the lack of typical eolian sedimentary features such as horizontally laminated or cross-bedded well-sorted sand precludes recognition of sediment sequences deposited as dunes or as thick sand sheets such as those described by Fryberger et al (1979) and Kocurek and Nielson (1986). Similarly, the lack of primary sedimentary structures or pedogenic aggregates and a lower clay content distinguishes Ogallala and Blackwater Draw loess from fluvial mudrocks such as those described by Rust and Nanson (1989).…”

Sedimentary paleoenvironments of the Toro Negro Formation (Neogene), Andean broken foreland, northwest Argentina.

“…Se reconocen dos tipos: aquellos con estratificación entrecruzada en artesa en grandes 'sets' que son interpretados como la migración de protodunas a dunas de crestas sinuosas semejantes a las mencionadas en otros sistemas eólicos intermontanos Tripaldi y Limarino, 2005. Mientras que las areniscas macizas o con difusa estratificación horizontal representarían mesoformas estacionarias como sombras de arena, gozes o zibars (Fryberger et al, 1979;Tripaldi y Limarino, 2008). Estos depósitos se desarrollarían durante los períodos de mayor aridez, cuando las planicies fluviales presentan abundante disponibilidad de sedimento para ser retrabajado por el viento y generar pequeñas intercalaciones eólicas, tanto de dunas como de formas estacionarias.…”