Characteristics and evolution of pyrobitumen-hosted pores of the overmature Lower Cambrian Shuijingtuo Shale in the south of Huangling anticline, Yichang area, China: Evidence from FE-SEM petrography

2020 ◽  
Vol 116 ◽  
pp. 104303
Author(s):  
Sile Wei ◽  
Sheng He ◽  
Zhejun Pan ◽  
Gangyi Zhai ◽  
Tian Dong ◽  
...  
Keyword(s):  
Lower Cambrian ◽  
The South ◽  
Huangling Anticline

scholarly journals Ediacaran to lower Cambrian basement in eastern George V Land (Antarctica): Evidence from U Pb dating of gneiss xenoliths and implications for the South Australia- East Antarctica connection

Lithos ◽  
2018 ◽  
Vol 318-319 ◽  
pp. 219-229 ◽  
Author(s):  
Gaëlle Lamarque ◽  
Jérôme Bascou ◽  
René-Pierre Ménot ◽  
Jean-Louis Paquette ◽  
Simon Couzinié ◽  
...  
Keyword(s):  
Lower Cambrian ◽  
South Australia ◽  
East Antarctica ◽  
The South

scholarly journals Ontogeny of the articulated yiliangellinine trilobite Zhangshania typica from the lower Cambrian (Series 2, Stage 3) of southern China

2016 ◽  
Vol 91 (1) ◽  
pp. 86-99 ◽  
Author(s):  
Jin-bo Hou ◽  
Nigel C. Hughes ◽  
Jie Yang ◽  
Tian Lan ◽  
Xi-guang Zhang ◽  
...  
Keyword(s):  
South China ◽  
Lower Cambrian ◽  
Southern China ◽  
Junior Synonym ◽  
Early Cambrian ◽  
South China Block ◽  
The South ◽  
Positive Allometry ◽  
Regional Correlation ◽  
Almost All

AbstractNew discoveries of the early Cambrian yiliangellinine trilobite Zhangshania typica Li and Zhang in Kunming preserve almost all instars from early postembryonic (protaspid) to mature (holaspid) phases in articulated state, in addition to mature specimens with antennae bearing paired spines on the basal articles. The ontogenetic series shows protarthrous development with some, but likely not all, early holaspid instars expressing additional pygidial segments, gradual rearward migration of the location of the longest pleural spines on the trunk segments, and striking positive allometry of the genal spines. It also reveals Parazhangshania sichuanensis Li and Zhang, 1990 to be the holaspid stage 3 of Z. typica, and therefore its junior synonym. This new find in the Hongjingshao Formation provides species-based regional correlation across the South China block and Z. typica may provide an important biostratigraphic marker for the base of the traditional Tsanglangpuan Stage.

scholarly journals Notes on the Precambrian to Lower Cambrian stratigraphy of the south-eastern part of Heilprin Land, Independence Fjord, North Greenland

1971 ◽  
Vol 35 ◽  
pp. 9-10
Author(s):  
H.F Jepsen
Keyword(s):  
Lower Cambrian ◽  
Eastern Shore ◽  
The South ◽  
South Eastern ◽  
North Greenland

As a member of the 7th Danish Peary Land Expedition in the summer of 1970 led by Count Eigil Knuth, the author had the opportunity to study a section through the Precambrian, Eocambrian and Lower Cambrian strata along the south-eastern shore of Heilprin Land (fig. 2). The main purpose was to examine the Precambrian Midsommersø dolerites (see below), and also to map the sedimentary formations of the area. This report describes the results of the mapping.

scholarly journals Biostratigraphic reconnaissance in the Lower Palaeozoic of western North Greenland

1984 ◽  
Vol 121 ◽  
pp. 19-51
Author(s):  
P.R Dawes ◽  
J.S Peel
Keyword(s):  
Fault Zone ◽  
Deep Water ◽  
Lower Cambrian ◽  
The South ◽  
The West ◽  
Middle Ordovician ◽  
Water Trough ◽  
Lower Palaeozoic ◽  
North Greenland ◽  
Land Region

Sections and fossil collections resulting from activities under Operation Grant Land 1965-66 in the Hall Land - Wulff Land region of western North Greenland are briefly discussed. Strongly tectonised Lower Cambrian to Silurian strata are present in the northern part of the area in association with the Wulff Land anticline and the Nyeboe Land fault zone. To the south, platform and deep-water trough sequences are generally little disturbed and strata range in age from Middle Ordovician to Late Silurian (Pridoli). Most stratigraphic units can be accommodated in stratigraphic schemes established in Washington Land, to the west, or Peary Land, to the east.

scholarly journals Glauconitic deposits at Julegård on the south coast of Bornholm, Denmark dated to the Cambrian

2011 ◽  
Vol 59 ◽  
pp. 1-12
Author(s):  
Lars B. Clemmensen ◽  
Richard G. Bromley ◽  
Paul Martin Holm
Keyword(s):  
Lower Cambrian ◽  
Trace Fossils ◽  
Upper Triassic ◽  
South Coast ◽  
The South ◽  
Shallow Marine ◽  
Marine Deposits

Bioturbated, glauconitic siltstones and sandstones are overlain by presumed Upper Triassic deposits at coastal exposures at Julegård on the south coast of Bornholm. These glauconitic deposits have not previously been dated. A 40Ar-39Ar dating of the glaucony gives an age of 493 ± 2 Ma suggesting the deposits belong to the Lower Cambrian Norretorp Member of the Læså Formation. The shallow marine deposits are strongly bioturbated, but only a single ichnoassociation is represented. The ichnogenus is referable to either Trichophycus Miller and Dyer, 1878 or Teichichnus Seilacher, 1955. Rare examples of Rusophycus Hall, 1852, probably trilobite trace fossils, are also represented.

NEW RESULTS OF INTEGRATED LITHOFACIES AND BIOSTRATIGRAPHICAL STUDY OF THE LOWER CAMBRIAN OSA HORIZON IN THE SOUTH OF THE SIBERIAN PLATFORM (BOLSHETIRSKAYA 7 WELL)

2021 ◽  
pp. 56-66
Author(s):  
D. A. Tokarev ◽  
◽  
A. V. Plyusnin ◽  
A. A. Terleev ◽  
N. A. Ivanova ◽  
...  
Keyword(s):  
Sea Level ◽  
Fourth Order ◽  
Siberian Platform ◽  
Lower Cambrian ◽  
The South ◽  
Reef Complex ◽  
The Core ◽  
Rear Part ◽  
Sequence Boundaries ◽  
Small Shell

The section of the Osa Subformation of the Usolka Formation of the Lower Cambrian Tommotian stage penetrated by the Bolshetirskaya 7 well in the south of the Nepa-Botuoba anteclise has been studied. As a result of lithological-facies investigations, seven lithological types of rocks were identified, they are regularly replaced by each other along the section. Facies environments of the reef complex were dеtected: bar bank, rear part of the reef, organogenic bioherm bildup, reef rear bars, reef buildup, core of reef buildup. In the section of the subformation, three fourth-order sequences are identified. The sequence boundaries are fixed by subaerial hiatuses represented in the core by sedimentation breccias, karst zones. The largest lowering of sea level, in terms of amplitude and duration, is confined to the border of the second and third sequences. The conducted biostratigraphic analysis confirms the Lower Cambrian age. Remains of calcareous algae Renalcis polymorphum, R. gelatinosum, R. granosum, Botomaella zelenovi were found. Small shell fauna of the genus of Namacalathus Grotzinger, Watt ers et Knoll. also was found. It has global distribution in the Lower Vendian (Ediacaran) deposits in Namibia, Brazil, Canada, Oman, Spain, China, Russia, etc.

Étude géologique du socle ante-mésozoique au nord du Massif Armoricain: limites et structures de la Domnonée

1975 ◽  
Vol 279 (1288) ◽  
pp. 123-135 ◽  
Keyword(s):  
Seismic Data ◽  
Lower Cambrian ◽  
The South ◽  
The West ◽  
Middle Cambrian ◽  
Middle Ordovician ◽  
Fundamental Structure ◽  
The North ◽  
Caledonian Orogeny

The study of samples taken on the bottom of the sea north of the Massif Armoricain, and the geological, magnetic, gravimetric and seismic data collected on land and at sea, confirms that this region is characterized by: (1) a series of horsts where fragments of Pentevrian and Cadomian orogenies outcrops; (2) gullies, or synclines, of Palaeozoic terrain. The separation of the horsts is the result of tectonic shearing which developed during the Ordovician, Carboniferous and Triassic ages. The Cadomian chain, which constituted the fundamental structure of the region, was broken up very early and is no longer recognizable. In the west, traces of this chain seem to have lasted until the Llanvirnian. In the east, the uplands, which were probably less harsh, were levelled before the start of the lower Cambrian age. A general upwarp of the eastern part between the middle Cambrian and the middle Ordovician could correspond to a reaction to the Caledonian orogeny. The northern part of the Alassif Armoricain had little part in the Hercynian paroxysm, however, this period witnessed an important tangential tectonism, the horsts riding over the edges of the synclines. The western formations show more marked structures than the eastern formations. The area which has been studied largely corresponds to the Domnonean domain, a puzzle of horsts and grabens. The Domnonea is itself a large horst, limited to the north by thick Palaeozoic sequences and to the south by the central Armorican zone and the Mancellian domain.

Sign in / Sign up

Export Citation Format

Share Document