Zarbuz Fm

Synonym: Zarbuzskaya Suite, Зарбузская свита

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It is represented by well-sorted quartzitic fine-grained sandstones, in the middle of which, as well as in the upper part in the Zaalaysky Range, there are layers of brownish-red clays. The sandstones are light gray at the base, becoming brownish-pink in the upper half. For the sandstones, the prevalence of fine sand fraction (82-87%) is characteristic, there are significant fluctuations in the content of carbonate material - from 15 to 60-65%, with a transition in the southern part of the area (Shagon, Yakhshobolo, Yakhshosaidun) into sandy limestones. For the sandstones of the Obiniouskaya zone, a distinctive feature is the presence of horizontal fine stratification. To the east (Vasmikuhskaya zone of the Southwestern Darvaz, Northern Darvaz, Zaalaysky Range), various types of stratification prevail in the sandstones with the prevalence of large gentle oblique unidirectional and multidirectional; to the east, the sorting of terrigenous material worsens. The thickness of the suite ranges from 210 to 850 m.

In the Zaalaysky district, in the mountains of Peter I to the Shkeldarin Fm and to the Zarbuz Fm, by position in the section, are conditionally attributed, following A.K. Kafarsky and Pyzyanov (1963), varicolored sandstones, claystones, and clay shales with a thickness of 600-800, in places up to 1200 m.

The basis of the complex is Classopollis pollen (up to 95%). Constant components are the pollen of plants Dissacites sp., Araucariacites sp., Cerebropollenites mesozoicus Coup. and spores Cyathidites minor Coup., Matonisporites equiexinus Coup., Osmundacidites welmani Coup in Darvaz district. In the In the Zaalaysky district, organic remains have not been found, the age is conditional, it is assumed by analogy with the sections described above from the Southwestern Darvaz.