Results 191 to 200 of about 41,082 (236)

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.
openaire   +1 more source

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
openaire   +1 more source

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
openaire   +1 more source

The Lower Precambrian in the Structure of Paleozoids of the Subpolar Urals

Doklady Earth Sciences, 2019
Rocks of Early Precambrian age have been established in many polymetamorphic complexes of the Urals. However, there is no doubt that only two polymetamorphic complexes (Taratash and Aleksandrovsk), located on the western slope of the Urals, belong to the Archean–Paleoproterozoic sequence.
Yu. I. Pystina, A. M. Pystin, V. B. Hubanov   +2 more
openaire   +1 more source

Origin of the Antietam Formation (Late Precambrian?--Lower Cambrian), Central Virginia

SEPM Journal of Sedimentary Research, 1970
ABSTRACT The Antietam Formation (Late Precambrian ?-Lower Cambrian) is a succession of quartz-rich clastics which occur in the upper part of the Chilhowee Group in the Central and Southern Appalachians. In central Virginia, the Antietam consists principally of orthoquartzitic and protoquartzitic sandstone.
openaire   +1 more source

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.
openaire   +1 more source

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.
openaire   +1 more source

Lower Cambrian and Upper Precambrian Strata of Beaver Mountains, Utah

AAPG Bulletin, 1968
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.
openaire   +1 more source

Acritarchs from the Bohemian Precambrian (Upper Proterozoic) and Lower-Middle Cambrian

Review of Palaeobotany and Palynology, 1974
Abstract Acritarchs and other microfossils from the Bohemian Upper Proterozoic are briefly discussed together with an evaluation of their stratigraphic value in the Precambrian rock sequences. It is shown that part of the presumed Upper Proterozoic in Bohemia could well belong to the Lower Paleozoic (Cambrian).
openaire   +1 more source

Late Precambrian and Lower Palaeozoic palaeomagnetic results from South Australia and Western Australia

Earth and Planetary Science Letters, 1974
Abstract The late Precambrian to Lower Palaeozoic apparent polar wander curve previously defined from palaeomagnetic studies in central and northern Australia has now been shown to be valid for southern and western Australia. During the latest Precambrian and Lower Palaeozoic a pole path of length 180° is now identified.
B.J.J. Embleton, J.W. Giddings
openaire   +1 more source