DESCRIPTIVE GEOLOGY: SLATE ZONE. 147 



eastern side of the ridge allowing the Nummulitics now to constitute 

 the crest of the main ridge the rest of the way to Musta. For some 

 distance south of the " S " of Seree the Jura-Cretaceous band 

 follows a hollow between the main ridge and a little spur formed of 

 Trias on the " r " of Seree, whilst beyond, the eastern slopes of Musta, 

 though deeply wooded, embrace a normal section from the Slate 

 series through the Trias, Jurassic, and Cretaceous, up to the Nummu- 

 litic. About one mile north of Musta the Cretaceous band, in the 

 form of a sharp anticlinal (already referred to in the neighbourhood 

 of Hariala in the Hertoh river), passes by a deep gap to join up 

 with the band on the eastern side of the main ridge. 



Along the Sichar spur the base of the Trias was followed as far 

 as the "T" of Telkandi ; but beyond this no exploration was made 

 by Hira Lai; so that the hill-spurs in that direction, which are rug- 

 ged and precipitous, have eluded our survey on the two occasions 

 when our party were in the neighbourhood. (See p. 126.) 



The sections noted in the margin were approached from the Koon- 



_ it . ., o, . har river as a a base of operations. The head- 

 Sections in the Slate r 



series N.E. of Tandi- streams of the Booee N. drain down from Phoot 



dni along the Booee, ••••«• 



Luree, and Silole hill (6,054 ft.). Edwards explored the junction 



between the Infra-Trias and the slates. He 



found purple limestone and sandstone and shale belonging to the 



former, but the basal conglomerate was not visible. Their dip was 



70 W.N.W. Some pale blue-grey slates in the Slate series were 



pyritous, the small cubical crystals of iron-pyrites being £ inch 



across. Along the Booee N. and on the hill-spurs round about the 



uniform slate hills present a very bare appearance, except for the low 



jungle of Sunhetta and Justitia adhatoda. The general strike of the 



cleavage of the slates is N.E. or N.N.E. and the dip N.W. or W.N.W., 



and the cleavage generally coincides with the bedding, but not 



always. It may even occur at right angles to it. The Koonhar river 



where the Booee N. joins it, and up-stream towards Gurhee-Hubeeb- 



ooluh is a deeply cut gorge of a distinct V-shape, as opposed to the 



U-shaped valley at Gurhee-Hubeebooluh. Recent river-gravels 



may be seen at various heights on the sides of the Koonhar valley, 



L 2 ( 147 ) 



