Sedimentation settings and the late pleistocene-holocene geochronology in the Vychegda River valley

Did long‐term fire control the coniferous boreal forest composition of the northern Ural region (Komi Republic, Russia)?

“…populations are limited to the Ural Mountains. Such an hypothesis for the dynamics of soils and river systems was likewise suggested by Zaretskaya, Panin, Golubeva, and Chernov (2014) to explain the chronology of geological events, including the lake dynamics in the Vychegda River Valley of the Republic of Komi. This dark taiga was likely limited spatially to lower areas and stream systems, contrary with the light taiga that was found on slightly higher areas.…”

The SIS limits and related proglacial events in the Severnaya Dvina basin, northwestern Russia: review and new data

“…The composition of the Late Pleistocene terraces is twofold: the lower (bottom) part is usually composed of alluvium (sands, sandy gravels and pebbles, loams and sometimes peat or loamy peat of oxbow lake deposits); the upper part is usually formed by deposits of aeolian origin: in the upper reaches of the river these are silts presumably of niveo-aeolian genesis (for example, at the Kur'jador section, Maksimov et al, 2015;Andreicheva et al, 2015) blanketing the surrounding landforms, but in most part of the valley these are sands without grading with dunes on the surface (Zaretskaya et al, in press). The Late Glacial terraces demonstrate the same composition: the age of their alluvial bottom parts varies between 17 and 12 cal kyr BP (Zaretskaya et al, 2014), and no varved clays have been identified.…”

“…Since the beginning of 21 st century, the arguments were proposed in favour of the limited distribution of the LGM proglacial lake in the Vychegda valley (Sidorchuk et al, 2001) and in the middle reaches of the Northern Dvina (Zaretskaya et al, 2014;Maksimov et al, 2015). Since 2011 we provided studies of terraces composing the intra-valley fluvial complex of Vychegda, tracing them from the upper reaches (Severnaya Keltma valley) to river mouth near Kotlas city.…”

“…2c). In Lower and Middle Vychegda this is characteristic for MIS 6/5 terraces formed at the initial stages of river restoration after the MIS 6 ice sheet retreat, whereas all dated MIS 2 terraces are composed totally of alluvium in their above-river parts and have elevations mostly below 10 m (Zaretskaya et al, 2014;Zaretskaya et al, in press). Terrace alluvia is devoid of organic matter suitable for radiocarbon dating, which is not typical for the MIS 2 terraces that are usually rich in peat layers and other organic remains.…”

The paleogeographic history of the Lycopodiella Inundata (l.) Holub (lycopodiaceae) in the European North

“…Àíàëèç ëèòåðàòóðû ïî ïàëèíîëîãèè ïîçâîëÿåò ïîäâåðãíóòü ñîìíåíèþ ðåëèêòîâóþ ïðèðîäó ñîâðåìåííûõ ìåñòîíàõîaeäåíèé L. inundata íà Åâðîïåéñêîì Ñåâåðå è ñ÷èòàòü ýòîò âèä àëëîõòîííûì ýëåìåíòîì ôëîðû.  ïîëüçó ýòîãî ãîâîðÿò è íàøè ìíîãîëåòíèå èññëåäîâàíèÿ ñïîðîâî-ïûëüöåâûõ ñïåêòðîâ ïîçäíåëåäíèêîâüÿ è ãîëîöåíà, ïðîâåäåííûå â ëàáîðàòîðèè ãåîëîãèè êàéíîçîÿ Èíñòèòóòà ãåîëîãèè Êîìè ÍÖ ÓðÎ ÐÀÍ [1,6,8]. Ïî÷òè âî âñåõ ôîññèëüíûõ ïàëèíîñïåêòðàõ ñïîðû ýòîãî âèäà îáíàðóaeåíû íå áûëè, çà èñêëþ÷åíèåì ðàçðåçà ×åðíàÿ Ãîðêà íà Ïîëÿðíîì Óðàëå [26].…”