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To date, the Late Paleozoic lepidophytes of the Orulgan range (Northern Verkhoyansk Region) were represented by the genera Angarophloios, Angarodendron, Lophiodendron, Tomiodendron. In 2014, the author, together with I.V. Budnikov, R.V. Kutygin, L.G. Peregoedov and V.I. Makoshin studied the sections of the Lower Carboniferous layer-by-layer in the upper reaches of the Sobolokh-Mayan River (the Bylykat and Nimnecheen rivers) and made new collections of fossil flora. During monographic studying the collection of fos...

The most ancient Late Paleozoic flora of the Verkhoyansk is known only on the western slope of the Orulgan Range, where relatively abundant complex of the Early-Middle Carboniferous vegetative remains was identified in the Bylykat Formation by N.A. Shvedov in sixties of the last century. The Bylykat Formation was defined as the lowest stratigraphic unit of the Verkhoyansk terrigenous complex, exposed in the core of the Orulgan anticlinorium [8]. Volume, division into subformations and stage belonging of this predo...