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Journal Article

Statistical Analysis of Cross-Bedding Azimuths from the Kamthi Formation around Bheemaram, Pranhita: Godavari Valley

Supriya Sengupta and J. S. Rao
Sankhyā: The Indian Journal of Statistics, Series B (1960-2002)
Vol. 28, No. 1/2 (Nov., 1966), pp. 165-174
Stable URL: http://www.jstor.org/stable/25051567
Page Count: 10
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Statistical Analysis of Cross-Bedding Azimuths from the Kamthi Formation around Bheemaram, Pranhita: Godavari Valley
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Abstract

Azimuths of cross-bedding foresets having sense and magnitude can be treated as vectorial quantities. Conventional statistical tests being not applicable to these circularly distributed vectorial data, these azimuth readings have been analysed with the help of special tests developed for the purpose. Resultant vectors of 1001 cross-bedding azimuths from the Upper Permian (or Lower Triassic) Kamthi rocks, believed to be of fluviatile origin, indicate a general northerly paleo-direction of sediment transport. High consistency ratio values for the cross-bedding readings from the point-bar and channel-bar deposits which constitute the Middle and Upper Kamthi units, indicate that the flow of the Kamthi river was predominantly unidirectional during the later phase of Kamthi sedimentation. In the Lower Kamthi, cross-bedding measurements were made in the sand lenses interpreted to be the cut-off meander channels of the river, which were preserved within the interchannel flood plain deposits. Comparatively higher dispersion of cross-bedding azimuths noted in this unit is apparently the result of river meander. Vector resultants of cross-bedding azimuths in the Lower, Middle and Upper Kamthi units are 36°06', 0°55' and 342°27' respectively. Statistical analysis reveals that the paleocurrents in the three Kamthi units were very significantly different. This leads to the conclusion that the northwesterly shift of the Kamthi paleocurrent with time, is a significant one.

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