MALLET, VINDHYAN SERIES. ^7 



cHaracteristic ribboned aspect. Such is their appearance at the base^ 

 but above they interstratify with bands of ordinary shale and sandstone, 

 which increase in amount until they imperceptibly pass into another sub- 

 division. No. 5 is much disturbed and contorted in this region, dipping" 

 in both directions, but the general inchnaiiion is northerly. 



From the total extinction of the Keinjua range of hills near Burdhee, 

 the middle bands of the series are greatly concealed between this village 

 and Agoree. It is the most contracted portion of the lower Vindhyan 

 area, and the alluvium lies deep on both sides of the river. It seems in- 

 deed that the several bands are really less developed. Observations of 

 the felspathic or trappoid beds are very scant, although they are probably 

 to some extent represented. This fact may perhaps be taken as a hint 

 corroborative of others as to the origin of this peculiar rock ; it is em- 

 phatically most developed in the vicinity of crystalline rocks, as if some- 

 how connected with their detritus. From the Goput, westward, the 

 northern portion of the slate area is profasely affected by granitic intrusive 

 rock, but between this river and the Eehund such intrusions are 

 entirely absent. Shortly to the east of the Rehund granitic rocks 

 become predominant, and here, too, the felspathic beds are largely 

 developed. 



The porcellanic beds are found again at Bm-dhee, and are finally 

 developed in the Amarpoor section, as well as frequently seen between 

 these distant points. In the latter neighbourhood the rock is a white or 

 yellowish-grey porcellanic shale, which seems to have been formed of 

 impalpably fine-grained material, and which frequently shows a minutely 

 sharp lamination. It is also remarkable for a fine jointing in two 

 planes at right angles to that of the lamination and to each other, which 

 thus spHt the mass into pretty regular little cubes ; most commonly, 

 however, rendered abortive by a curious conchoidal jointing, which 

 confuses and obhterates the normal regularity. The only observation of 

 the trappoid rock in the west seems to be in the Mahanuddy, where, a 



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