Lacly Geological Section
On the territory of the Yangan-Tau Geopark there are typical sections of the Bashkir stage, which served as the basis for the establishment of the Bashkir layers. According to the zoning scheme for the Middle to Late Carboniferous epoch, the carboniferous deposits belong to the Yuryuzan-Ay district of the Ufa-Belsky subzone of the West Ural structural and facies zone. The deposits of the Bashkir stage form two bands — the meridional and latitudinal strike, forming a series of beautiful rocky outcrops, which include the Lakla section.
The Bashkir strata were first characterized by V.D. Nalivkin (1949) in the Lakly River section. Detailed, layer-by-layer description of the section along the left slope of the Lakli River valley (left tributary of the Ai River) 0.7 km above S. The origin and its division by foraminifera and brachiopods into horizons (Suransky, Akavassky, and Belaya Rivers) was given by Z.A. Sinitsina (1975).
Lacly's section has the status of a parastratotype, like the sections used by the author of the subdivision in the initial definition of the stratotype in order to further characterize it.
The boundary of the Serpukhov and Bashkir tiers is drawn in the roof of the striatifer shell rock layer. The Suran sublayer of the Bashkir stage is represented by thin-layered limestones, less often medium-layered, fine-grained, slurry-fine-granular and finely dispersed limestone structure with grain sizes < 0.01 mm (micrite) with interlayers of oolitic and dolomitized. The power of the Suran sublayer is 33 m.
The Akavassky sublayer is composed of limestones, mainly medium-layered fragments of skeletal formations of organisms, algal (donnellian), less often micrite, with interlayers of oolitic, limestones consisting of parts of the calcareous skeleton of sea lilies (crinoids), and organogenic-clastic. There are flint nodules and lenses with a power of 59 m. The Askynbash sublayer is composed of medium- and thick-layered donnellian and organogenic detrital limestones with interlayers of crinoid and foraminiferous, less often micrite limestones, lenses, nodules and silicon interlayers are frequent, thickness 52 m.
The limestones of the Bashkir stage are intermittently overlain by the terrigenous strata of the Kurkin formation of the Upper Carboniferous (Sinitsyna, 1975). The limestones of the Akavassky and Askynbash horizons form a spectacular rocky outcrop.
The boundary of the Serpukhov and Bashkir tiers is drawn in the roof of the striatifer shell rock layer. The Suran sublayer of the Bashkir stage is represented by thin-layered limestones, less often medium-layered, fine-grained, slurry-fine-granular and finely dispersed limestone structure with grain sizes < 0.01 mm (micrite) with interlayers of oolitic and dolomitized. The power of the Suran sublayer is 33 m.
The Akavassky sublayer is composed of limestones, mainly medium-layered fragments of skeletal formations of organisms, algal (donnellian), less often micrite, with interlayers of oolitic, limestones consisting of parts of the calcareous skeleton of sea lilies (crinoids), and organogenic-clastic. There are flint nodules and lenses with a power of 59 m. The Askynbash sublayer is composed of medium- and thick-layered donnellian and organogenic detrital limestones with interlayers of crinoid and foraminiferous, less often micrite limestones, lenses, nodules and silicon interlayers are frequent, thickness 52 m.
The limestones of the Bashkir stage are intermittently overlain by the terrigenous strata of the Kurkin formation of the Upper Carboniferous (Sinitsyna, 1975). The limestones of the Akavassky and Askynbash horizons form a spectacular rocky outcrop.
Geolocation
Address:
Republic of Bashkortostan, Salavatsky district, Lakly village
Republic of Bashkortostan, Salavatsky district, Lakly village