Results 71 to 80 of about 139 (121)

Paleopleurocapsa wopfnerii gen. et sp. nov.: A Late Precambrian alga and its modern counterpart. [PDF]

Proc Natl Acad Sci U S A, 1975
Knoll AH, Barghoorn ES, Golubić S.
europepmc   +1 more source

WOODRING CONFERENCE ON MAJOR BIOLOGIC INNOVATIONS AND THE GEOLOGIC RECORD. [PDF]

Proc Natl Acad Sci U S A, 1961
Cloud PE, Abelson PH.
europepmc   +1 more source

NEW TYPE OF LARGE GOLD MINERALIZATION IN YENISEI RIDGE, RUSSIA

RUDN Journal of Engineering Research, 2016
The paper deals with principal results of exploration carried out in the Sredne-Ishimbinskaya area. The area studied lies in the central part of the Yenisei gold province.
R Kh Mansurov, V V Diakonov
doaj  

Stromatolites and pulsed oxygenation events in the Mesoproterozoic Longjiayuan formation of western Henan: evidence for life-environment co-evolution. [PDF]

Sci Rep
Li Q, Zheng D, Sun F.
europepmc   +1 more source

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LITHIUM-FREE LITHIOPHORITE FROM THE UPPER RIPHEAN SEDIMENTS OF SALAIR

International Geology Review, 1990
(1990). LITHIUM-FREE LITHIOPHORITE FROM THE UPPER RIPHEAN SEDIMENTS OF SALAIR. International Geology Review: Vol. 32, No. 3, pp. 302-317.
V. P. Rakhmanov, P. F. Andrushchenko, L. N. Vyal'sov, G. V. Sokolova, A. I. Tsepin   +4 more
exaly   +2 more sources

The Sr isotope chemostratigraphy as a tool for solving stratigraphic problems of the Upper Proterozoic (Riphean and Vendian)

Stratigraphy and Geological Correlation, 2014
Published and original data on the Sr isotopic characterization of carbonates from the Riphean and Vendian key sections of the Southern Urals, Siberia, Asia, Africa, Australia, and North America are considered in compliance with the suggested principles of reconstructing the Sr isotopic composition of the Proterozoic seawater.
M A Semikhatov, I M Gorokhov
exaly   +2 more sources

Reconstruction of Source-Rock Composition of the Middle and Upper Riphean Rocks of the Isherim and Bashkir Anticlinoria, Urals

Geochemistry International, 2018
It is shown that the Riphean sediments of the Bashkir and Isherim anticlinoria of the Ural mobile belt were formed in different settings. Sediments of the Bashkir Anticlinorium are autochthonous and were formed in the eastern (in present-day coordinates) Baltica from proximal siliciclastics, whereas the complexes of the Isherim Anticlinorium did not ...
Yu L Ronkin, G A Petrov
exaly   +2 more sources

New data on Sr-and C-isotopic chemostratigraphy of the Upper Riphean type section (Southern Urals)

Stratigraphy and Geological Correlation, 2006
New data on Sr-and C-isotopic systematics of carbonate rocks from the Upper Riphean stratotype (Karatau Group of the southern Urals) are obtained for several southwestern sections of the Bashkirian meganticlinorium, which have not been studied before.
M A Semikhatov, E M Prasolov, M T Krupenin   +2 more
exaly   +2 more sources

The Upper Riphean of the Yenisei Range: Sr Chemostratigraphy and Pb–Pb Age of Limestones of the Tungusik and Shirokaya Groups

Stratigraphy and Geological Correlation, 2019
The Pb–Pb isotope age and the Sr isotope signature of the Upper Riphean sedimentary limestones from the south of the Yenisei Range on the western margin of the Siberian Craton were obtained. The Pb–Pb age of carbonate deposits of the Dadykta Formation of the Tungusik Group in the Kamenka facial zone in the east of the Yenisei Range is 1020 ± 20 Ma. The
G V Ovchinnikova
exaly   +2 more sources

Paleobiocoenoses in the middle-upper riphean stratotype of the Southern Urals

Doklady Earth Sciences, 2012
V N Puchkov, N D Sergeeva
exaly   +2 more sources