Changes

Fluvial and sabkha sediments deposited in interdune areas can be permeability barriers and baffles within eolian sediments ([[:file:M91FG171.JPG|Figure 2b]]). These may either be confined to interdune areas and of limited extent or they can be laterally extensive on a basin scale.

Fluvial and sabkha sediments deposited in interdune areas can be permeability barriers and baffles within eolian sediments ([[:file:M91FG171.JPG|Figure 2b]]). These may either be confined to interdune areas and of limited extent or they can be laterally extensive on a basin scale.

Baffles of limited areal extent in interdune areas are described by Shebi<ref name=Shebi_1995 /> from the Tensleep Sandstone of the Bighorn Basin in northwestern Wyoming and southwestern Montana. These are thin, discrete intervals of dolomite and anhydrite, about 0.15–0.7 m (0.5–2 ft) thick and with lateral dimensions on the scale of a few meters to tens of meters. The dolomite and anhydrite intervals are interpreted as sabkha deposits, which formed in wet interdune areas and playa lakes.

Baffles of limited areal extent in interdune areas are described by Shebi<ref name=Shebi_1995 /> from the Tensleep Sandstone of the Bighorn Basin in northwestern Wyoming and southwestern Montana. These are thin, discrete intervals of [[dolomite]] and anhydrite, about 0.15–0.7 m (0.5–2 ft) thick and with lateral dimensions on the scale of a few meters to tens of meters. The dolomite and anhydrite intervals are interpreted as sabkha deposits, which formed in wet interdune areas and playa lakes.

Studies in the western United States have shown that some sabkha units can be traced for several kilometers within the Mesozoic eolian sediments.<ref name=Crabaughandkocurek_1993>Crabaugh, M., and G. Kocurek, 1993, [http://sp.lyellcollection.org/content/72/1/103.abstract Entrada Sandstone: An example of a wet eolian system], in K. Pye, ed., Dynamics and environmental context of eolian sedimentary systems: Geological Society (London) Special Publication 72, p. 103–126.</ref> Cyclic climatic conditions resulted in alternating dune sandstone and widespread sheet-like fluvial deposits in the Jurassic Kayenta-Navajo Formations of northeastern Arizona.<ref name=Herries_1993>Herries, R. D., 1993, [http://sp.lyellcollection.org/content/73/1/199.abstract Contrasting styles of fluvial-eolian interaction at a downwind erg margin: Jurassic Kayenta-Navajo transition, northeastern Arizona, U.S.A.], in C. P. North and D. J. Prosser, eds., Characterization of fluvial and eolian reservoirs: Geological Society Special Publication 73, p. 199–218.</ref>

Studies in the western United States have shown that some sabkha units can be traced for several kilometers within the Mesozoic eolian sediments.<ref name=Crabaughandkocurek_1993>Crabaugh, M., and G. Kocurek, 1993, [http://sp.lyellcollection.org/content/72/1/103.abstract Entrada Sandstone: An example of a wet eolian system], in K. Pye, ed., Dynamics and environmental context of eolian sedimentary systems: Geological Society (London) Special Publication 72, p. 103–126.</ref> Cyclic climatic conditions resulted in alternating dune sandstone and widespread sheet-like fluvial deposits in the Jurassic Kayenta-Navajo Formations of northeastern Arizona.<ref name=Herries_1993>Herries, R. D., 1993, [http://sp.lyellcollection.org/content/73/1/199.abstract Contrasting styles of fluvial-eolian interaction at a downwind erg margin: Jurassic Kayenta-Navajo transition, northeastern Arizona, U.S.A.], in C. P. North and D. J. Prosser, eds., Characterization of fluvial and eolian reservoirs: Geological Society Special Publication 73, p. 199–218.</ref>