Thomas Abel Brimage Spratt,
Quarterly Journal of the Geological Society of London
(1877)
“ After ascending for half an hour the western ridge bounding the Kosloo valley, where a mass of limestone decidedly overlies the coal-bearing deposits, we reached and followed the backbone of a ridge nearly 2000 feet above the sea, where the shales and schists composing it appeared to be but little inclined from the horizontal position, but whether conformable or not with the former or latter could not be determined ”
