**Author details**

Zahid A. Khan1 and Ram Chandra Tewari<sup>2</sup> \*

1 Directorate Geology and Mining U. P. (Retired) 'Khanij Bhawan', Lucknow, India

2 Department of Geology, Sri Jai Narain Post Graduate College (Retired), Lucknow, India

\*Address all correspondence to: ram.tewari9@gmail.com

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