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- Title
Fluvial-aeolian interactions: Part II, ancient systems.
- Authors
Langford, R. P.; Chan, M. A.
- Abstract
An understanding of fluvial-aeolian deposition derived from modern case-examples in a previous study is applied to the Permian Cutler Formation and Cedar Mesa Sandstone on the Colorado Plateau. These formations supply an excellent three-dimensional exposure of intertonguing fluvial and aerolian strata. Four distinct facies associations form the bulk of the Cutler Formation and Cedar Mesa Sandstone: (1) aeolian dune deposits; (2) wet interdune deposits; (3) fluvial channel deposits; and (4) overbank-interdune deposits. In addition, two distinctive types of erosion surfaces are found within the Cutler Formation and Cedar Mesa Sandstone: pebble- to granule-rich erosion surfaces (aerolian deflation surfaces) and flood surfaces. Fluvial and aerolian intertonguing result in extensive tabular sheets of aerolian sandstone separated by flood surfaces and overbank-interdune deposits. Fluvial channels are associated with the deposits overlying flood surfaces and are incised into the underlying aerolian sandstones. Overbank-interdune deposits and wet interdune deposits cover flood surfaces and intertongue with overlying Aeolian sandstones. The primary characteristics of ancient fluvial-aeolian deposition are overbank-interdune deposits and pronounced extensive erosion surfaces (flood surfaces), which are parallel to underlying fluvial sandstones and thus trend parallel to the palaeoslope and palaeohydrological gradient.
- Subjects
COLORADO Plateau; SANDSTONE; SEDIMENTATION &; deposition; EROSION
- Publication
Sedimentology, 1989, Vol 36, Issue 6, p1037
- ISSN
0037-0746
- Publication type
Article
- DOI
10.1111/j.1365-3091.1989.tb01541.x