NERBUDDA DISTRICT. 187 



matrix in the conglomerate almost always coincides with those places 

 where the schist-limestone outcrops at or near the junction of the two 

 formations. 



At the old fort of Choarigurh (see map), 20 miles S. W. of Nursingpore, 



,«. ■ ' t i a set of low hills are composed of the conglomerate. 



Choarigurh conglo- l = 



merate - Here it is formed exclusively of white quartz 



pebbles, held together by a minimum quantity of a red sandy earthy 

 matrix; all the pebbles are small ; the largest not exceeding 3 inches in 

 diameter. 

 At the base of Nimbnagurh hill, on the contrary, there may be notic- 



Nimbnagurh conglo- ed neaU the viIla S e ° f Berair man y SUch lar g e 



merate • fragments in the conglomerate. 2 feet in diameter is 



a common size ; and these are often very angular and little worn. In this 

 conglomerate blocks of many varieties of the schists were noticed, besides 

 granite, syenite, and greenstone, also bedded in a brown felspathic sand- 

 stone base. The hill shows a clear section of about one thousand feet of 

 this Mahadeva conglomerate and although as we ascend, sandstone bands 

 are more and more frequently intercalated, yet many pebbly layers are 

 found up to the very summit. 



Near Hutnapur the crystalline rocks are found to a height of at least 



300 feet above the valley level where the conglo- 

 Hutnapur conglomerate. 



merate beds rest on them. The crystalline lime- 

 stone here supports the Mahadeva rock, the matrix of which however is 

 Conglomerate becomes not calcareous, although containing many frag- 

 finer in the upper beds. ments of the schist ii mes tone. There, as at Nimb- 

 nagurh, the conglomerate at the hill base is found to contain large and 

 little worn blocks, which are not found higher up ; in the upper beds the 

 size of the fragments becomes gradually less, and they are more rounded, 

 until at top only a few pebbly bands occur in the sandstone of which the 

 mass is there made up. 

 But besides this, if any bed of the true conglomerate portion be follow- 



