ON CUPRIFEROUS TUFFS. 279 



TRIASSIC. 



Ilawkeshury Series. 



Thickness 340 feet coarse greyish -white and yellowish -grey 

 sandstone, passing towards base of series into fine sandstone, 

 alternating with tine dark sandy-shale and clay shale, the last 

 containing well preserved leaflets of Thinnfeldia. 



Narrabeen Shales. 



Thickness 650 feet (about), 86i- feet chocolate ferruginous clay 

 shale breaking with semi-conchoidal fracture, getting darker and 

 more sandy towards the base. 573^ feet (about) chiefly fine 

 grained greyish-white and yellowish-grey sandstone with coaly 

 grains in places, with bands of dark and light grey sliales becoming 

 more carbonaceous downwards, with six inches of quartz-pebble 

 conglomerate at base of beds. 



Estheria Shales. 



Thickness 310 feet (about). 



57' 0" Greenish-grey gritty sandstone, and fine grained grey 

 sandstone, and grey clay shale. 



45 Feet tufis and tuffjiceous clay shale, dark greenish- and 

 reddish-purple, intei'bedded with greenish-grey sandstone and 

 coarse grit, cupriferous at depths of 1065^^ feet and 1072 feet 

 from the surface. 



178 Feet (about) carbonaceous gritty sandstone, dark grey 

 mudstone, grey clay shale, black clay shale with fossil leaves, and 

 at base of beds 75 feet of conglomerate and fine sandstone with 

 bands of chert. 



P E R M 0-C A R B N I F E R U S. 



Upper Coal Measures. 



Thickness 213 feet (about) grey and greenish-grey clay shales, 

 dark carbonaceous sandy-shales, and dark carbonaceous sandstone 

 •with gritty Ijands, with small concretionary nodules of clay iron- 

 stone, and four feet of gritty compact sandstone immediately over- 

 laying coal seam. 



4' 8"^ Coal seam, splint coal with thin layers of bituminous coal. 



60' 0" Dark grey carbonaceous shale and clayey sandstone 

 passing downwards into forty-eight feet of dark grey sandstone. 



6' 1" Coal seam. 



1' 9" Dark shale. 



LiTHOLOGY. 



Some idea of the lithological character of the Cupriferous 

 Shales and Tuffs may be gathered from the following detailed 

 sections of them : — 



