Results 121 to 130 of about 321 (175)

YUDOMIAN (VENDIAN) OF THE TYPE LOCALITY

Russian Geology and Geophysics, 1994
With new data obtained, the Yudomian Series (the Siberian Vendian) is characterized more precisely and more comprehensively in its type locality (Bol. Aim R. basin and near the Yudoma R. mouth). The new data corroborate the Tommotian age of the most ancient layers of the Pestrotsvet Formation in the region, which overlap here the Yudomian deposits with
V. V. Khomentovsky, G. A. Karlova
openaire   +1 more source

Metameric features in the Vendian metazoans

Italian Journal of Zoology, 1998
Abstract Metamerism as the serial homology is widespread among the Vendian (Late Precambrian) metazoans. Prevalence of segmented forms among the Vendian Bilateria suggests that in many phylogenetic lineages of Metazoa the evolutionary development of the bilateral symmetry and metamerism were related processes.
openaire   +1 more source

Paleoecological feedback and the Vendian-Cambrian transition

Trends in Ecology & Evolution, 1988
The emergence of abundant skeletonized animals during the Vendian-Cambrian transition is seen by paleontologists as an 'explosion' when nearly all basic designs of invertebrate life appeared for the first time in the fossil record. Breakthroughs in trophic strategy, involving an increasing three-dimensionality in the benthic habitat and positive ...
openaire   +2 more sources

Was Scotland a Vendian RRR junction?

Journal of the Geological Society, 1994
In Early Palaeozoic time northern Scotland occupied a 120° promontory between the Appalachian and Greenland Iapetus-facing margins of Laurentia. It is proposed that this originated at a triple rift (RRR) jundion between Laurentia and two other continents, possibly Baltica and West Gondwana.
openaire   +1 more source

Chapter 12 Pre-Vendian history

Geological Society, London, Memoirs, 1997
It so happens that rocks of Vendian age are extensive and are well exposed in Svalbard. This applies especially to early Vendian, i.e. Varanger, with two distinctive glacial horizons as are treated in the Chapter 13. The Early Varanger (Smalfjord) episode can be correlated in most sections and so provides a reference horizon which serves approximately ...
W. Brian Harland, Nicholas J. Butterfield   +1 more
openaire   +1 more source

Vendian strata in their type area

Geological Magazine, 1987
AbstractIn the Eastern European region Vendian strata are divisible into two complexes: the lower one, only locally developed, is composed of alternating tillites, volcanics, sandy–clay rocks and dolomites; and the upper one, of alternating sandstone, siltstone, and mudstone strata with medusoid fauna, resting transgressively on the lower complex and ...
openaire   +1 more source

New Vendian Metazoa with Colonial Organization

Paleontological Journal
A new organism with colonial organization, Olgunia bondarenkoae gen. et sp. nov., of sponge or coelenterate grade, is described from the Vendian deposits of the South-Eastern White Sea region. The new genus is characterized by a modular pattern and coordinated growth of neighboring individuals arranged in a fan-shape. The new genus has a combination of
openaire   +1 more source

The Eocambrian (Vendian sensu stricto)

1983
Different geologic formations that originated after the Katangan orogeny are here attributed to the Eocambrian, the time of their formation being after 680–650 m.y. and prior to the beginning of the Cambrian period, that is earlier than 570 m.y. The duration of the Eocambrian is thus 100–80 m.y., which is much shorter than that of other principal units
openaire   +1 more source

Chapter 13 Vendian History

Geological Society, London, Memoirs, 1997
The Vendian Period, the latest Precambrian division, and the earliest division in which several Phanerozoic methods of correlation can be applied, is a convenient time division for Svalbard. It is separated from the earlier history in which correlation has uncertainties of tens of millions of years if not more.
openaire   +1 more source

The Baykonurian glaciohorizon of the Late Vendian

Stratigraphy and Geological Correlation, 2009
Glacial deposits occurring close to the Vendian-Cambrian boundary were discovered long ago in several regions of Asia and West Africa. New data of recent years confirm earlier observation and specify age constraints of these deposits. In certain sections, glacial sediments rest on beds with the Upper Vendian fossils (Vendotaenia sp., Sabellidites ...
openaire   +1 more source