This classification shows that the majority of samples are classified as quartz arenite, few samples from the sediments of core I are plotted in the field of Fe-sands and a single sample from core II is classified as sublitharenite
I: quartzarenite; II: subarkose; III: sublitharenite
; IV: arkose; V: lithic arkose; VI: feldspathic litharenite; VII: litharenite.
On the basis ofthe framework composition and whole-rock geochemistry (major elements), the sandstone is classified as Quartzarenite and Sublitharenite
. Petrographic studies reveal that the sandstone contain quartz, feldspar and rock fragments of sedimentary and metasedimentary rocks.
Petrology and provenance studies of the Siwalik Group sandstones by Critelli and Ingersoll (1994) indicated sublitharenite and lithic arenite composition of sandstones and their sources to be the Tethyan Himalayan and Lesser Himalayan zones uplifted during the India-Eurasia collision.
Arenites were further classified into subarkose, sublitharenite and lithic arenites, whereas wackes were further distinguished as felspathic wackes (TABLE 3, FIGURE 6b).
Two types of cementing material in the quartz arenite, quartz litharenite and sublitharenite
of lithofacies-3 may be due to the chemical weathering of iron bearing minerals of parent rocks (igneous, sedimentary and metamorphic) in the oxidizing conditions.
The lenses of sublitharenite
sandstone in which the coprolites occur are discontinuous and sometimes rippled.
Lithology Thickness (m) OGALLALA FORMATION 20 Sandstone, orange pink (5 YR 7/4 to 8/4) fine not measured to medium-grained calcite-cemented sublitharenite
, with thick beds of pebble conglomerate composed of chert, quartzite, and sedimentary rock fragments.
Fine grain calcareous immature sublitharenite
is the main composition of Khangiran formation (Fig.
Quartzarenites dominate in the SE areas, while sublitharenites
and subarkoses become dominant northwards, parallel to the thinning of the Genna Selole Fm.
(1987) majority of the sandstones of the Dasht Murgha group and Malthanai formation are lithic arenites while some samples are sublitharenites
(Kasi 2012; Kasi et al.
The petrological interval S1 corresponds to the Prato Solaro Member of the Servino Formation and is essentially made up of sublitharenites