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The AAPG/Datapages Combined Publications Database

Journal of Sedimentary Research (SEPM)

Abstract


Journal of Sedimentary Petrology
Vol. 62 (1992)No. 3. (May), Pages 530-535

Rain-impact Microtopography (RIM): An Experimental Analogue for Fossil Examples from the Maroon Formation, Colorado

Albert J. Robb, III (2)

ABSTRACT

Small-scale sedimentary features in medium- to coarse-grained siltstones (loessites) of the Maroon Formation (Middle Pennsylvanian to Early Permian) of northwestern Colorado are interpreted to be of rain-impact origin. These features, which have been experimentally produced by simulated oblique rain impact, are herein termed rain-impact microtopography, or RIM. Experiments indicate that RIM forms only in sediments ranging from fine silts to medium very fine sands (7 ^phgr to 3.5 ^phgr). Probable fossil (ancient) examples of RIM superficially resemble numerous other sedimentary and biogenic structures, but a variety of observations and experimental procedures demonstrate their uniqueness. ecognition of RIM can be valuable as an indicator of subaerial exposure and paleowind direction.


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