Shemshak Group

Filicophyta, Coniferales, Bennetitales and Equisetales dominate the flora, which indicates the deposition of this formation in relatively tropical and rainy environments in islands, deltas and river banks.

> cycads: > Bennettitales: > Ferns: > Ginkgoopsida: > Conifers: > Pteridospermatophyta: > Equisetidae: > Other plants: Other animals > Cephalopoda (ammonites, etc) > Bivalvia: > Brachiopod: [10] [2][10] In the Triassic, Iran changed the conditions and type of sedimentary basins of that time as a result of the tectonic forces of a large orogeny called Late Cimmerian.

Due to these geographical and climatic conditions at that time, relatively homogeneous shale and sandstone deposits along with coal layers begin to form in these swampy-kulabi environments, which continue to the Middle Jurassic, about 170 million years ago.

[1] The Shamshak Group is actually a sedimentary cycle whose deposits indicate the existence of wide plains and marsh-river basins and sometimes shallow seas.

In the cutting site of this formation model that Aserto has chosen in the upstream of Rote valley in the north of Lazim pass, he has divided the Shamshak formation into four rock zones: *Lower sandstone: 70 to 100 meters thick, including an interval of whitish quartz sandstones with thin layers of shale and coaly shales.