The end of the Cambrian Period in eastern Alborz was the time of a lowstand, when a unit of cross-bedded quartzose
sandstones with Cruziana trace fossils and billingsellide brachiopod shell beds was deposited within shoal systems nearshore.
Similarly to the subdivisions in Wisconsin, the Van Oser Member in Minnesota is described as a medium-grained quartzose
sand; and the Norwalk and Waukon Members are very fine-grained feldspathic sands (Thomas, 1992).
The grains were cemented and diagenetic reactions took place under humid, warm climatic conditions, affected by minor tectonic disturbances which led to the development of mature sandstones classified as "Quartz Arenite" or Quartzose
Dark-brown thin-bedded Dictyonema Shale containing laminae and lenses of quartzose
silt and sand.
the Kallavere, Turisalu and Varangu formations, and most of the Leetse Formation) are terrigenous, mainly consisting of glauconitic and/or quartzose
sandstones and shales (Suuroja et al.
The dated sample G/08-11-91 is a felsic tuff and consists of deformed, crystal-rich lithic tuff with sub-equal proportions of crystal and lithic fragments in a recrystallized quartzose
Light-coloured sandstones of this member, formed during the initial phase of the Lontova transgression, are inequigranular, texturally mature, quartzose
, seldom feldspathic quartzose
The TST sandstones are mineralogically quartzose
and feldspathic arenite with the quartz content of 70-85%.
These basal Tetagouche strata occur within the transition from a deep-water fan complex of quartzose
psammitic and pelitic turbidites of the Miramichi Group (Rice and van Staal 1992) and deposition of the overlying volcanic-chertgreywacke assemblage of the Ordovician Tetagouche Group, a transition representing the change from a stable continental margin to an unstable volcanic back-arc setting marked by rifting, local uplift and erosion, followed by mainly felsic volcanism and subsidence.
The Variku Formation is characterized by alternating dolomitic argillaceous quartzose
siltstone, silty marl, and dolomitic claystone beds 10--50 cm in thickness (Fig.
In the study area the Voronka aquifer consists of quartzose
sandstone and siltstone and the conductivity of rocks (K) ranges from about 0.
Limestone associated with quartzose
sandstone in the lower part of the Goss Point Formation contains a conodont assemblage dated as Late Ordovician (late Caradocian to Ashgillian) (Nowlan et al.