Results 151 to 160 of about 2,604 (197)

Spectral analysis of a Precambrian limestone-shale sequence, lower Vindhyan, India

Precambrian Research, 1988
Abstract The Precambrian Lower Vindhyan limestone-shale sequence which exhibits predominantly subtidal shelf facies, has been subjected to the power spectrum analysis. The limestone percentages calculated at 20 cm intervals at Pipradih I (Tuira-Pipradih) and Pipradih II (Dhabua) sections form raw data for the analysis.
B.K. Chatterjee, P.K. Sen
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Microfossils of Lower Cambrian and Precambrian deposits in eastern Siberia

Review of Palaeobotany and Palynology, 1967
Abstract Early Cambrian and Late Proterozoic deposits in the south of eastern Siberia (Irkutsk amphitheatre) contain a large quantity of microfossils in carbonate and terrigenous rocks. Numerous finds of fossils are particularly important for the terrigenous part of the Uschakovsk and Motsk Formations.
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The Late Precambrian/Lower Cambrian Bonahaven Dolomite of Islay and its stromatolites

Scottish Journal of Geology, 1972
Synopsis The Bonahaven Dolomite (?295 m thick) lies in the Dalradian sequence between the Port Askaig Tillite (beneath) and the Jura Quartzite (above) and is best developed on Islay (Inner Hebrides). The sequence in the formation at five coastal outcrops is figured and four members erected.
Anthony M. Spencer, Margaret O. Spencer
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Lower Precambrian Stromatolite Associations of Karelia

1992
The Archean-Lower Proterozoic strata of the eastern Baltic Shield contain stromatolites, microphytolites, acritarchs, and other problematic fossils which form characteristic assemblages. Each assemblage is characteristic of a certain stratigraphic unit at the regional scale.
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Microfossils from the Lower Kundelungu (Late Precambrian) of Zambia

Precambrian Research, 1977
Abstract Lower Kundelungu black argillites and silty dolomicrites from the Ndola area contain a rich microfossil assemblage, of which several forms can be attributed to the form-genus Fibularix Pflug, 1965. The same assemblage has also been found in fine-grained, mildly metamorphosed sedimentary rocks from Kalengwa and Karibarembi (North-Western ...
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Lower precambrian metapelites of the Yenisei Range: REE systematics, provenances, paleogeodynamics

Doklady Earth Sciences, 2010
The Yenisei Range represents a Precambrianfolded structure in the southwestern margin of theSiberian Craton. The Lower Precambrian rock associations in the southerly located Angara–Kan block arerepresented by the Kan granulite–gneiss and Yeniseischist—gneiss complexes. North of the Angara River,gneisses and crystalline schists outcrop in the Yeniseiand
A. D. Nozhkin, N. V. Dmitrieva, O. M. Turkina, A. V. Maslov, Yu. L. Ronkin   +4 more
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Paleomagnetism of upper Precambrian to lower Paleozoic intrusive rocks from Colorado

Geological Society of America Bulletin, 1977
The paleomagnetism of the Iron Mountain–McClure Mountain alkalic intrusive complex in the northern Wet Mountains of Colorado has been investigated. Published radiometric ages for the complex, and for similar intrusive rocks nearby, range between 485 and 704 m.y.
R. B. FRENCH, D. H. ALEXANDER, R. VAN DER VOO   +2 more
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Lower Cambrian and Upper Precambrian Strata of Beaver Mountains, Utah

AAPG Bulletin, 1968
ABSTRACT Cambrian Prospect Mountain Quartzite and seven underlying units, tentatively considered Precambrian, are mapped in the Beaver Mountains. This concordant section begins where alluvium covers the base of the oldest unit and ends at the contact between the Prospect Mountain Quartzite and the overlying Pioche Shale.
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Lower palaeozoic and precambrian petroleum source rocks and the coalification path of alginite

Organic Geochemistry, 1992
Organic-rich samples derived from a Middle Cambrian Formation in the Georgina Basin, and from the Middle Proterozoic of the McArthur Basin in northern and central Australia, yielded alginite ranging from immature oil shale material to overmature residue. A maturation scale has been developed based on the thermal evolution of alginite as determined from
Glikson, Miryam, Taylor, Dennis, Morris, Douglas   +2 more
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LOWER CAMBRIAN-PRECAMBRIAN SUCCESSION, WHITE-INYO MOUNTAINS, CALIFORNIA

Geological Society of America Bulletin, 1962
The approximately 21,000 feet of Lower Cambrian and Precambrian strata exposed in the White Mountains and Inyo Mountains, California, and vicinity is divided into eight formations. The upper four are new and constitute essentially what heretofore has been called the Silver Peak group, a term herein abandoned.
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