Subsequent erosion has resulted in the exposure of these bed forms and provides a rare opportunity to accurately reconstruct the three-dimensional geometry of an ancient eolian system and to relate bed-form morphology to bounding-surface geometries. The recognition and use of bounding surfaces continues to be a problem in the study of modern and ancient aeolian sediments. Further, aeolian deposition and preservation is more complex and episodic than can be accommodated by the restrictive requirements of the climbing bedform model. Layering and Unidirectional Flow Bedforms. The bounding surfaces of a bed form its upper and lower surfaces and represent intervals of non-deposition or erosion.
No preview Article Apr 2016 Geological Society London Special Publications. Interdunes have thus been treated separately by geologists; even though they evolve interdependently with surrounding dunes. Eolian sabkha deposits form when dry sand is blown across damp surfaces near the water table, particularly in evaporitic settings such as White Sands. Clearly, in this bedform, the dune crest deposits, which consist of ripple strata have grown higher than the slipface. AA(Department of Geological Sciences, University of Texas, Austin, TX 78713 U.S.A.) Publication:Sedimentary Geology, Volume 56, Issue 1, p. Extensive bounding surfaces in eolian sequences form with bedform migration (first-order bounding surfaces) and hiatuses in erg development (super bounding surfaces).
This chapter discusses the reconstruction of bedform assemblages from compound crossbedding. The origin of bounding surfaces in ancient eolian sandstones.