These sedimentary deposits have undergone weak regional metamorphism which permitted the transformation of schist to seritoschists, chloritoschists, graphitic schists, sandy schists, and quartzites, to coarse grained conglomeratic quartzites, to quartzite of medium grained, fine-grained quartzites and to differentiate the phyllitic
and siliceous facies.
The basement of the study area consists of Triassic phyllites, phyllitic
schists and partially metamorphosed clastic rocks (metaarkose, metagraywacke) (Kahya and Kuscu, 2014)(Fig.
Slate and phyllite occur as low lying highly fissile rocks with diagnostic slaty and phyllitic
The geology of the area consists of anatectite-bearing Greater Himalayan sequence phyllitic
schist, paragneiss and orthogneiss that generally increases in metamorphic grade and anatectite content up structural section.
Martin  divided the metasedimentary rocks in three sections: a lower section (Mireles Phyllite) essentially phyllitic
and fossiliferous metalimolite; an intermediate (Cerrajon Metapelite) with interlayering of sterile quartzite, exposed in the central and north central parts of the massif; and a top sterile (Canaote Quartzite), of medium to coarse grain quartzite, exposed in the southwestern parts.
Samples collected from the Garnet Hill locality contain idiomorphic garnet porphyroblasts up to two centimeters in diameter that have grown in a fine-grained phyllitic
The alliance occurs on non-calcareous substrates, such as granite, gneiss, and phyllitic
schists, on serpentine, on hard and soft marls, on volcanic soils, and on sand.
By intervals, there are joints corresponding to a deposition of whitish, phyllitic
(clays) or reddish (ferric oxides) minerals.
Some display crenulation cleavage; all have a phyllitic
alignment of the platy minerals.
The two primary soil types of High Valley are weathered volcanic residue and Franciscan Complex weathered sandstone, shale or phyllitic
The oldest comprises siliciclastic rocks of the Vampire Formation (Neoproterozoic to Early Cambrian), which locally consists of a rusty-weathering phyllitic
shale that is grey on fresh surface and, in places, calcareous.
The Paleozoic sediments have undergone very low-grade regional metamorphism with induration of the sandstone to quartzite, and the black shales are locally phyllitic
with lenticular shear fractures and spaced cleavage.