Depositional environment of the Krol Group of the Nainital area and its impact on the stromatolites |
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| Authors: | S B Misra |
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| Institution: | (1) Department of Geology, Kumaun University, 263 001 Nainital, India |
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| Abstract: | Depositional environment of the Krol group varied temporally from subtidal in the Manora to intertidal in the Sleepy Hollow
times. The conditions that succeeded were peritidal in the Ayarpatta and supratidal in the Narainnagar times. These conditions
were the main controlling factors in the growth and development of the algal stromatolites. The Manora formation, due to subtidal
conditions, and the Sleepy Hollow formation, due to detrital influx, are almost devoid of stromatolites. The carbonates of
the Ayarpatta formation representing a peritidal complex possess columnar and oncolitic stromatolites, while the sediments
of the Narainnagar formation characterized by supratidal features contain blistered, domal and crinkled-laminar forms. The
types and sizes of stromatolites therefore are governed by the depositional conditions prevailing in the sedimentary basin. |
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| Keywords: | Depositional environment Krol Group stromatolites Manora Formation Sleepy Hollow Formation Ayarpatta Formation Narainnagar Formation |
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