Imbricated repetition of caliche limestone in a duplex structure in the North River area appears to be related to the emplacement of the thrust slice
, but is directed toward the west--this opposing thrust fault arrangement may be akin to a triangle zone structure, as recognised in the Alberta Rockies (Ollerenshaw 1978), and demonstrates that brittle deformation also continued through the Carboniferous rocks in some areas.
40Ar/39Ar hornblende ages of rocks obtained to the east of the dome in the vicinity of the Indus syntaxis, and to the west of the dome in the Malakand thrust slice
, are 51 +-2 Ma, 50 +-3 Ma, and 53 +-2 Ma.
The Himalayan mountain chains from south to north are comprised of three large tectonic thrust slices
and related folds separated by four major fault systems.