Of the variety of problems that it presents one might mention the petrological questions connected with the intrusion of the great masses of granite, and their relation to the slates and associated metamorphic rocks.
"The Panjab, North-West Frontier Province, and Kashmir"
Sir James McCrone Douie
Actinolites are found in some highly metamorphic gneisses, brought by landslips from the neighbouring heights.
"Himalayan Journals V2."
J. D. Hooker
27. General Character of metamorphic Rocks.
"Geology"
James Geikie