Gurud Fm

Includes in Dushanbe-west Shirkent-Luchob, east Shirkent-Luchob. (Gubin, 1937; Resolutions..., 1959)

Synonym: Gurudskaya suite, гурудскую свита

Reference section:

(up to 400 m) is composed of gravelites, rarely conglomerates, quartz sandstones of coarse-to fine-grained varieties, siltstones, clays, carbonaceous rocks, and coal beds. In outcrops where the Tashkutan Fm (ташкутанская свита) is absent, at the base of the section, basal medium- to coarse-gravel conglomerates or gravelite breccias are present.

In those sections where the Tashkutan Fm (ташкутанская свита) is present, the section starts with the Lower Jurassic. In these deposits, we have identified and determined plant remains Marattiopsis hoerensis (Schimp.) Halle, Phlebopteris polypodioides Brongn., P. torosa Sixt., Coniopteris sp., Hausmannia leeiana Sze, Clathropteris obovata Oishi,Cladophlebis sp., Pterophyllum sp., Ginkgo ferganensis Brick, Pagiophyllum sp., Elatides curvifolia (Dunk.) Nath. Above this complex, B.S. Luchnikov identified plant remains of Equisetum ferganensis Sew., Marattiopsis muensteri (Goepp.) Schimp., Hausmannia leeiana Sze, H. forchhammeri Barth., Clathropteris obovata Oishi, Todites sp., Coniopteris hymenophylloides (Brongn.) Sew., C. latifolia Brick, Cladophlebis haiburnensis (Lindl et Hutt.) Schimp., C. denticulata (Brongn.) Font., Phlebopteris polypodioides Brongn., Pterophyllum baieri Zeil., Anomozamites minor (Brongn.) Nath., Nilssonia vittaeformis Pryn., N. dentata Brick, Ginkgo ferganensis Brick, Phoenicopsis angustifolia Heer, Elatides curvifolia (Dunk.) Nath. The considered complex of plants contains, along with ancient forms, more recent ones, such as Equisetum ferganensis, representatives of the genus Coniopteris, Ptilophyllum, however, their role in the complex is still insignificant. This allows us to refer the complex to the upper Jurassic (Toarcian). In those sections where the Tashkutansky suite is absent, the Jurassic section begins with the Middle Jurassic (possibly, lower Jurassic deposits are present at the bottom), in which we have identified plant remains of Equisetum ferganensis Sew., E. beanii (Bunb.) Harris., Klukia exilis (Phill.) Racib., Coniopteris spectabilis Brick, C. latifolia Brick, C. furssenkoi Pryn. C. maakiana (Heer) Pryn., C. angustiloba Brick, C. zindanensis Brick, Cladophlebis whitbiensis Brongn., C. stenolopha Brick, C. suluctensis Brick, C. haiburnensis (Lindl. et Hutt.) Schimp., C. nebbensis (Brongn.) Nath., Taeniopteris ferganensis Brick, Sagenopteris phillipsi (Brongn.) Presl, Nilssonia acuminata (Presl) Goepp., N. vittaeformis Pryn., N. orientalis Heer, N. polymorpha Schenk, N. compta (Phill.) Brongn, Ginkgo ferganensis Brick., G. digitata (Brongn.) Heer, Elatides curvifolia (Dunk.) Nath., E. setosa (Phill.) and others.

In the highest horizons of the Turudskaya suite (гурудской свиты), the author has identified and determined Coniopteris hymenophylloides (Brongn.) Sew., C. furssenkoi Pryn., Cladophlebis denticulata (Brongn.) Font., Ptilophyllum acutifolium'Morr., Otozamites ptilophylloides Brick, Otozamites sp., Pachypteris lanceolata Brongn., Brachyphyllum sp. The upper plant complex, containing among typically Middle Jurassic forms, younger Otozamites, Pachypteris, and Brachyphyllum, belongs to the Bathonian stage.