12 WALKER: GEOLOGY OF KALAHANDI STATE. 



the Jeypore frontier near Ampani, and one or two small outliers in 

 the adjacent gneiss region. 



The Cuddapahs are here represented by slates, grey chocolate and 

 drab, and by white and buff quartzites. In the small outlier made up 

 of the two narrow hills just west of Chochanbali, the rocks along the 

 line of junction of the gneiss and Cuddapahs resemble, in many 

 respects, the contact products which are usual where granite is in- 

 truded into slates. Breccias, flecked slates and dark blue fairly massive 

 varieties were observed, but under the microscope these last did not 

 shew either cordierite or andalusite, though these minerals are fre- 

 quent in rocks which resemble these rocks macroscopically. This in- 

 teresting outcrop has been referred to in a previous chapter while 

 discussing the age and origin of certain of the members of the schist 

 complex. The schists around the hills in question are fairly well 

 foliated gneiss (or granite ?), which judging from these contact results 

 must have been formed by the foliation of an intrusive granite of 

 post Cuddapah age. (Specimens of contact products 15*202 to 15*209.) 



VII.— GONDWANAS. 



Near the Kalahandi-Patna boundary on the south bank of the Tel 

 river there is a small exposure, of gritty sandstone, not exceeding a 

 few acres in extent. Very indistinct traces of original stratification 

 can be observed in the rocks of the outcrop in question. The sand- 

 stone is usually coarse enough to be called a grit and frequently con- 

 tains well rounded boulders of gneiss sometimes several pounds in 

 weight. 



Mr. Ball in his traverse of the country to the north discovered 

 several small outcrops which he regarded as Talchir sandstone. It is 

 probable that they are isolated patches forming outliers in the crystal- 

 line rocks, but geologically related to the Gondwanas of the Talchir 

 coal field which is some seventy-five miles to the north-east. No 

 fossils were discovered. (Specimens 15*212 and 15*2 13.) 



