GEOLOGY OF THE COOMA DISTRICT, N.S.W. 191 
there are strong indications of a gradual passage from the 
crystalline schists through phyllites to Ordovician slates. 
Going due west from Kiaora homestead, one notices that 
the Slack’s Creek phyllites appear to grade into dark 
micaceous slates which become less micaceous and more 
like ordinary slate. At McCarty’s Crossing, near the 
junction of Bridle Creek and the Murrumbidgee, are bands 
of hard dense blue-black slates interbedded with whitish- 
grey felspathic-looking slates, and dipping east. The black 
slates contain obscure marks of graptolites, which have 
been identified as such by Mr. W. 8S. Dun. Lithologically 
these slates are similar to those interbedded with the 
phyllites on Slack’s Creek, and appear to be of the same age. 
Going west along the Adaminaby road slates similar to 
those at McCarty’s crossing are found to occur as far as 
Wambrook Creek. I was unable to examine in detail the 
slates occurring here, but Mr. C. F. Laseron has kindly 
shewn me specimens of slates containing well-preserved 
graptolites, found by him some distance up Wambrook 
Creek from the road, and exhibited before the Linnean 
Society in1909.* Mr. Laseron has also very kindly furnished 
me with the following list of the graptolites represented:— 
Diplograptus foliacius (very abundant), Climacograptus 
bicornis, C. hastata (very abundant), Dicellograptus 
elegans, D. caduceus, D. affinis, (?) Pleurograptus. 
These slates are chiastolite-bearing, the presence of this 
mineral being due to contact metamorphism of the slates 
by the intrusion of the Berridale granite. 
Following the Adaminaby road past Wambrook Creek 
one meets with a succession of rotten slates, and farther 
on of quartzites, extending right on to the outcrop of the 
Berridale granite, about 14 miles out from Cooma. These 
+ Proc. Linn. Soc. N.S.W., xxxiv, 1909, p. 118. 
