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1
Aeolian Sand and Sand Dunes
A bimodal distribution of foreset dip directions was found in the Libyan seif dune
trenched by McKee & Tibbitts (1964) (Fig. 7.2.4). They argued that because the
dip of the grain-flow deposits on a seif dune lies at right-angles to the dune crest,
...
Kenneth Pye, Haim Tsoar, 2008
2
Desert sedimentary environments
They represent the bedding on the horns of the dune and are very similar to that
seen in a seif dune. 4. Low-angle dips oriented up-wind may be preserved when
a barchan climbs onto the windward accretion slope of a more slowly moving ...
This horn is elongated by storm winds until it enters the flow of sand moving from
the other horn (3—4). , Subsequently the horn is elongated by winds from both
directions to form a sinuous linear, or seif, dune (5). By contrast, in the model ...
Michael A. Summerfield, 2014
4
Arabian Deserts: Nature, Origin and Evolution
Internal structure and surface geometry of a longitudinal (seif) dune. Journal of
Sedimentary Petrology, 52:823-831 Tsoar, H. 1983. Dynamic processes acting
on a longitudinal (seif) sand dune, Sedimentology, 30:567-578 Tsoar, H., &
Yaalon, ...
5
Geological Survey Professional Paper
McKee, E. D., and Moiola, R. J., 1975, Geometry and growth of the White Sands
dune field, New Mexico: U.S. Geol. Survey Jour. Research, v. 3, no. 1, p. 59-66.
McKee, E. D., and Tibbetts, G. C. Jr., 1964, Primary structures of a seif dune and ...
Geological Survey (U.S.), 1980
6
United States Geological Survey Professional Paper
95), "The higher wind velocity, the larger the seif dune and the greater the
interdune spacing." The origin of linear dunes has long been a matter of
controversy; many geologists (Bagnold, 1941, p. 223; McKee and Tibbits, 1964;
Twidale, 1972, ...
7
Geomorphology of Desert Dunes
1983a 'Dynamic processes acting on a longitudinal (seif) dune'. Sedimentology,
30, 567–578. —— 1983b 'Wind tunnel modeling of echo and climbing dunes'. In
M.E. Brookfield and T.S.Ahlbrandt (eds), Eolian Sediments and Processes, ...
8
Saudi Arabia: An Environmental Overview
... BP) immediately before the onset of the Neolithic wet phase NW SE MODERN
SEIF DUNE HOLOCENE LAKE HOLOCENE LAKE LATE PLEISTOCENE LAKE
PALEOSOL SURFACE (ROOT & STEM ENCRUSTATIONS) PALEO - (?) ...
9
Earth Environments: Past, Present and Future
As seif dune crests meander, the angle ofwind approach fluctuates along the
length of the dune, which affects whether the lee-side flow is erosional or
depositional (Figure 22.20). As formative winds are bidirectional, either
seasonally or daily, ...
David Huddart, Tim Stott, 2010
The third type of dune is the longitudinal or seif dune (Figs. 4.19C and 4.20A).
These are long, thin, sand dunes with sharp median ridges. Individual dunes may
be traced for up to 200 km, with occasional convergence of adjacent seifs in a ...
