SEC. ll.J ABUASSA. 275 



others they may have been removed by denudation. Here, for instance, 



a peak seems to have projected into the surrounding trap, still the partial 



and isolated occurrence of these quartzites seems frequently inexplicable, 



unless by the supposition of some such agency as outlets of superheated 



steam. 



South of Naithra a very sharp disturbance of the ground appears 



to have been accompanied by a fault cutting out 

 Naitlira. 



the traps in one place, and in another concealing 



both these and the lateritie band. A smaller fault diverges from this 



south of Naithra bett, and the Jurassic ground in the vicinity is greatly 



traversed by strong ' ramps' and * troubles.' 



In the neighbourhood of this line of fault, the Jurassic trap, lateritie 

 and tertiary beds, all dip steeply to south-20° to 30°-west, at angles 

 averaging about 40°, that of the latter, however, rapidly becoming less. 



These tertiary beds are raggy calcareous flags with broken shells 

 of Ostrea milticostata, &c., Bryozoa, and Cidaris spines underlying 

 clays and shales. 



They appear to belong to a much higher place in the series than 

 any of the basal groups to the westward. 



About Wumootee the trap beds are soft, amygdaloidal, and ashy 



looking, sometimes weathering of a greenish or 

 Wumootee. , i • , ,, ■■ . 



purple colour, and they extend into the plain 



for a short distance instead of terminating at the base of the hills — an 



observation that applies generally to the country between this and Eoha. 



The tertiary outcrop forms a small scarp rising from the trap- 

 ground, along which the lateritie representative of the sub-nummuhtie 

 group can be traced, though sometimes consisting only of a single bed. 



The Wumootee stream exposes some variegated unctuous clayey 

 rocks of this sub-nummulitic group, overlaid by a curiously tangled 

 coarse concretionary bed, succeeded by a bed of yellowish-red laterite, 



( 275 ) 



