28 MEDLICOTT^ SHILLONG PLATEAU. 



coarser varieties of the former Bryozoa are founds and in the purer layers of 

 limestone the weathered sections of shells^ mostly of small turrited gas-^ 

 teropods are common. This band is well seen at many points of the clifiPs^ 

 south of the station, where it is not more than 200 feet thick; again 

 in the cliffs and river courses north-west of Mamluh, where it is 

 somewhat thicker. In the cliffs at the head of the Nongpriong valley 

 this band (or at least strata partaking in its lithological characters) 

 occupies the whole section from the Cherra beds down to the conglo- 

 merate; audit must be some 500 feet thick. From here it must 

 thin out rapidly to the north : I could not identify it in any of the 

 sections beyond Lairungao. Thus this, the most calcareous band of the 

 cretaceous series, disappears on about the same line as the nummuhtie 

 limestone. If a name were needed, these beds might be caUed the 

 Langpar band, from the spur south of Maosmai, which is mostly com- 

 posed of them, although there is here still a capping of the Cherra band. 



The remaining sub-division, like the preceding one, seems to 

 have a limited north and south range. Its most general hthological 

 character is the presence of glauconite. Under the station of Cherra 

 this character seems confined to the upper portion of the band, there 

 being a considerable thickness of purely siliceous sandstone below it ; or 

 it may be that these should be grouped with the massive bottom sandstone 

 of Theria. South of Maosmai in the region of the Mahadeo terrace, the 

 glauconite band is largely developed, often forming strong beds of dark 

 green sand. In it too there is a good deal of disseminated carbonate 

 of Hme, and it contains much earthy matter, in thick beds with 

 exfoUating spheroidal weathering. This band is important as being 

 the most fossiliferous ; this is the case on the path below Mamluh ; 

 and on the same horizon above Mahadeo, in the stream under Laiso- 

 phlang. This band might conveniently take the name of Mahadeo. It 

 is probably in part represented in the great bottom sandstone of the 

 section at the base of the scarp. 



( 178 ) 



