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CSPG Special Publications

Abstract


Intl. Symposium of the Devonian system: Papers, Volume II, 1967
Pages 579-586
Biostratigraphy

Stratigraphic importance of the Devonian Flora of the USSR

N. M. Petrosyan

Abstract

In many regions of the USSR, Devonian deposits are represented by continental formations. The remains of terrestrial plants are used for their stratigraphic subdivision and correlation. Occurrences of plant remains are known from the Lower Devonian (Siberia, northeastern USSR, Kazakhstan), the Middle Devonian (in the regions mentioned above, and also in the Urals in middle Asia, Donbass, Timan and the Kola Peninsula) and the Upper Devonian (in most of the regions mentioned above).

The Devonian flora includes representatives of Psilopsida, Lycopsida and Pteropsida; types of Arthropsida occur in small quantity. In addition, vast numbers of plants of unestablished systematic position are nevertheless important in stratigraphic subdivision and correlation.

The plant assemblages typical of different intervals of Devonian time may be very similar or very different, depending upon ecological conditions.

As a result of the recognition of distinct floral assemblages relevant to definite intervals of the stratigraphic section, phytostratigraphic successions for the territories of Donbass, Timan, Kazakhstan and West Siberia have been worked out.

The study of the Devonian flora in different regions of the USSR shows that, beginning in the Early Devonian, the first distinctions in geographical distribution of separate forms appear. This permits the recognition of phytogeographic regions, in some cases provinces, which are distinguished from each other by groups of genera and proportions within these groups. The evolution of the Devonian flora in each phytogeographic region has its own peculiarities, the recognition of which is important for correlation of coeval deposits of remote districts.


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