178 



W. N. BENSON. 



nuovl- fy.100 ft 

 above 



Fig. 1. Sketch section of Barring ton Trigonometrical Station Hill 

 based on observations and collections made by Mr. Eustace Wilkinson. 



A. Carboniferous sandstone slates, shales and conglomerates, dip- 



ping in a general easterly direction at from 20° to 86° 



B. Dense olivine basalt with large phenocrysts of olivine ; about 



500 feet thick (Rock No. 1). 



C. Olivine dolerite (Rock No. 2) with natrolite. The most per- 



sistent rock of the district, always overlying the basalt. It 

 merges into the theralites. About 300 feet thick. 



D. Theralite of varying grain size and degree of zeolitisation 



(Rocks No. 3 and 4). It always overlies the finer grained 

 No. 2 rock. About 200 feet thick. 



E. Olivine dolerite (No. 2 Rock). About 100 feet thick. 



F. Basalt, very decomposed, with vesicles filled with natrolite 



and analcite. Made up of numerous flows. About 500 feet 

 thick. 



G. Olivine dolerite with a little theralite. 



