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Pacific Coastal & Marine Science Center

Bedform Sedimentology Site: “Bedforms and Cross-Bedding in Animation”

Cross-Bedding, Bedforms, and Paleocurrents

Photographs

Photo of rock or sand showing pertinent structure or structures; see caption below.

FIG. 35.  Structure produced by sinuous, out-of-phase bedforms; eolian deposits in the Navajo Sandstone (Upper Triassic? and Jurassic) near Snow Canyon, Utah. Dark spots on the outcrop are bushes approximately 1 m high.

RECOGNITION: This structure is a close approximation of the computer-generated structures formed by bedforms with out-of- phase plan-form geometries (FIG. 34).  Several of the most noticeable trough-shaped sets in the center of the outcrop are truncated relatively symmetrically on their right and left sides, a characteristic which is not shared with trough-shaped sets produced by along-crest migration of scour pits (FIG. 46) or by zig-zagging of scour pits (FIG. 59).  The trough-shaped sets in this deposit are less regular than in the preceding computer- generated structure but more regular and organized than in the following computer simulation of bedforms with pseudorandom crestlines (FIG. 36).

 

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