76 FOOTE : GEOLOGICAL STRUCTURE OF THE EASTERN COAST. 



of Punur, where mottled shales, precisely similar to those occurring to 



the south-east of Dronadula and west of Idupula- 

 Punur tank section. . 



padu, have been cut into about a couple of feet, 



and used in strengthening the tank mud. A cursory examination of 



these shales, which are moderately rich in organic remains, yielded — 



Plants. Animals. 



Dictyozamites indicus. Astarte ? >> 



JPtilophyllum acutifolium. Yoldia ? ) •* 

 Pterophyllum sp. 



West of the village the shales become more sandy in character and 



appear to pass into, or are replaced (underlaid) by 

 Shales replaced D y „ . , , , t-i , ,-, 



sandstones west of friable sandstones which must rest upon the 



gneiss. Buffy friable sandstones are exposed, but 

 very badly, in well-sections in the northern lobe of the Punur patch, at 

 the villages of Gannavaram and Yanamaduli. 



The Gannavaram sandstone contains a great quantity of highly de- 

 composed granite gneiss, and is very clayey. In the north-eastern lobes 

 of the patch, buffy friable shaly sandstones are exposed under thick 

 cotton soil, and some lateritic gravel in several well-sections between the 

 villages of Zagariamudi and Tanubudivaripalem. 



The Punur shales extend fully a mile and a half north-eastward of the 

 exposure in the tank bottom just referred to, and have been turned up 

 in the bund of a small tank by the side of the road to Polur. "White 

 stiff mottled fine-grained sandy shales have also been cut into in making 

 the bunds of the tanks at Vankoelupadu and Nutalapadu in the eastern 

 lobe of the Punur patch. 



Northward of the Punur patch comes a spread of alluvium which 

 hides all the Rajmahal rocks for a distance of 

 11 or 13 miles. The first patch of the Juras- 

 sic beds to be found here occurs at Kopparu, which stands at the 



northern end of a peninsula-like spur of slightly 

 Kopparu patch. 



raised ground stretching south from the southern 

 end of^the Kondavidu hills. 

 (' 76 ) 



