TALCIIIR SERIES. 



In an assemblage of rocks showing, generally speaking, such slight 

 deviation from original horizontality as those of the coal measures, exces- 

 sive contortions and inclinations of the strata, and the faulting there- 

 with connected are due to the localisation of yielding, through irre- 

 gularity of resistance, to wide spread forces. The runs of quartz -breccia 

 through the metamorphic series, indicating faults, were possibly at one 

 time within the limits of the coal measures, although now far outside 

 their boundary, and no doubt the pressure excited during the period of 

 the formation of these faults aided materially ,or pre- determined, those 

 derangements of which we shall speak in the following pages. When 

 endeavouring to resolve some of the difficulties which beset us relative 

 to the boundaries of this field, we must constantly bear in mind the 

 secondary efiects due to local compression accompanying faults, as well 

 as those which are the direct result of that active power to which 

 upheaval and depression of large tracts of country are owing. 



The series represented are the — Talchir, — Damuda, — and Panchet > 

 and I now propose to enter immediately into details regarding their 

 lithological characters, distribution, and relations. 



II. Talchie, Series. 



The area occupied by this series is limited in the present field. 



Little patches crop out every here and there from 



under the Damudas in the eastern part of the field, 



displaying the well known characters of the formation. The thickness of 



beds exposed in the various sections varies from a minimum of about 



20 feet to 100 feet and more. Outliers on the metamorphic rocks are 



numerous, and may be met with in any part of the country in the 



vicinity of the field. The hilly nature of the ground between Ooparbundah 



and Gobinpoor and the want of detail on the maps almost preclude the 



possibihty of any one successfully indicating every small spread of Talchirs; 



very few, however, I believe, have escaped detection, and even if they 



(43) 



