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The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 54 (1970)

Issue: 5. (May)

First Page: 835

Last Page: 836

Title: Petrography and Origin of Krol Sandstones Around Solon, Northwestern Himalaya, India: ABSTRACT

Author(s): Ajit Bhattacharyya, S. K. Chanda

Article Type: Meeting abstract


The area around Solon (lat. 30° 55^prime; long. 77° 07^prime) in northwestern sub-Himalaya, India, is the type area of the Krol Group (Permo-Carboniferous?). Petrologically the the Krol sandstones may be designated as coarse- to medium-grained sandstone: mature quartz and carbonate-cemented quartz arenite (Folk, 1966). Conspicuous presence of round grains of quartz led earlier workers to conceive of an eolian origin for these sandstones. Petrologic examination of the sandstone

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shows moderate amounts of different sedimentary rock fragments, no relation between size and roundness, and different degrees of roundness in the same size grade. All these features indicate the possibility of their derivation from preexisting rocks. To resolve the problem of origin of roundness, i.e., "eolian" versus "inherited," size analyses of the rounded and well-rounded grains, assumed to represent the airborne fraction, yield a mean size of 0.466 ^phgr. This value does not correspond to the size of the airborne load, as specified by Bagnold, nor does it correspond to the grain-size characteristics of the bimodal sands that are residuum in the eolian process. Thus the roundness of the Krol sandgrains is not from eolian action but is caused by the derivation of the sand grains fr m preexisting sandstone. In addition to the presence of glauconite, their close association with intraclastic, oolitic, and pelletiferous carbonate rocks indicates a shallow-marine origin for these sandstone beds.

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