Art. XIX. — Tlie Northtvard Extension of the Derrinal 

 Conglomerate (Glacial). 



By E. J. Dunn, F.G.S. 



[Read 9th December, 1897.] 



So much interest has been aroused in all that pertains to the 

 evidence of ancient glaciation in Australia and elsewhere, and 

 every additional fact developed excites such keen attention that 

 it is a pleasure to record some new localities. 



On the 1st of November last a very interesting locality came 

 under observation near the northern boundary of New South 

 Wales, latitude about 29° S. It is at the Ashford Coal Field, 

 Fraser's Creek Station, Severn River, Arravvatta County. The 

 Derrinal Conglomerate forms the basal beds of the Ashford Coal 

 Field. 



At Fraser's Creek homestead granite outcrops on the west 

 side of the river Severn, and strewn over this are numerous 

 pebbles and boulders of many varieties of porphyry, granite, etc., 

 derived from the glacial conglomerate which has been denuded at 

 this site. Scratched surfaces are plentiful and the variety of 

 pebbles, unlike any in place within the present watershed of the 

 Severn, are characteristics of the Derrinal Conglomerate. The 

 hard porphyry boulders have retained the scratches best of all ; 

 a specimen of these is exhibited. 



About two miles south from the homestead is Coal Gully 

 where a few hundred tons of coal have been mined, and along 

 which the section is made. To the east are brown shales and 

 sandstones, much buckled and disturbed, these are referred to by 

 the N. S. Wales geologists as Carboniferous Strike, N. 10 W. 

 Dip easterly 20°. Pitch at junction with the conglomerate N. 

 23°. On the upturned edges of these Carboniferous (?) rocks the 

 Derrinal Conglomerate was laid down and then succeeded in a 

 conformable manner to the conglomerate, black shales, grey shale, 

 a coal seam, then thick bedded sandstone, etc. At this site the 



