Shurysay-Fergana Fm

Includes in Fergana Valley, Isfara River

There is also a same-named Shurysay Fm in the Afghan-Tajik Basin of late Oligocene age and of a similar facies of "reddish-brown mudstones, sandstones and siltstones with gypsum, rare interbeds of limestone ", which is called the Shurysay-TajikBasin Fm in this lexicon to avoid confusion.

Synonym: Shurysai Fm, Shurysay Fm, Shurysay layers, ll[урысайские слои

Reference section:

In Alai-Fergana basin, it is brownish red-mudstones intercalated by siltstones, evaporite beds and sandstone; 20 – 160 m.

In the Southwestern Tajikistan are composed of interbedded red sandstones, siltstones, and clays. In their lower half, in the South Gissar, Qafirnigan, Vakhsh, and Zerafshan districts, thin layers of gypsum, dolomites, and limestones are occasionally present, in Zerafshan, there are layers of gravelites and conglomerates. The thickness of the Shurysay layers in the South Gissar and Dushanbe districts is 20-200 m, in the Qafirnigan - from several meters to 50, in the Vakhsh - 20-125, in the Zerafshan - up to 115 m.

Fossil remains in the Shurysay layers are extremely rare. Bivalve and gastropod molluscs prevail: Tellina postera (Beyr.), Cari angusta Phill., Cardium serogosicum Nossov, Congeria nysti Bosq., Pitar beyrichi (Semp.), Cyrtodaria angusta parva Sp., Cyrena convexa Brong, Lentidium georgiana Zot., Corbula sokolovi Kare., Turritella sp.