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Gutter casts from the Proterozoic Bijaygarh Shale Formation, India: Their implication for storm‐induced circulation in shelf settings
Author(s) -
Chakraborty Chandan
Publication year - 1995
Publication title -
geological journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.721
H-Index - 54
eISSN - 1099-1034
pISSN - 0072-1050
DOI - 10.1002/gj.3350300107
Subject(s) - geology , shore , storm , proterozoic , geostrophic current , geostrophic wind , oil shale , population , geomorphology , paleontology , seismology , oceanography , demography , sociology , tectonics
The orientations of elongate gutter casts occurring in inner shelf storm deposits of the Proterozoic Bijaygarh Shale Formation, India reveal a modal population oriented roughly parallel to the average trend of the associated wave ripples. Assuming that the wave ripple trend approximately represents the orientation of the contemporary shoreline, the shore‐parallel gutters appear to have been formed by the geostrophic current. Some gutters oriented at high angles to the inferred shoreline presumably represent incision by wave orbital currents in a storm‐induced combined flow regime. The gutters also show variations in the style of incision and infill, which may be useful in distinguishing between gutters formed by wave orbital and geostrophic currents, independently of their orientation pattern with respect to the palaeo‐shoreline.