Miospores from the Brigantian stratotype section at Janny Wood, Cumbria

2018 ◽  
Vol 62 (2) ◽  
pp. 89-100 ◽  
Author(s):  
Duncan McLean ◽  
Bernard Owens ◽  
David J. Bodman ◽  
Finlay D. McLean
Keyword(s):  
Stratotype Section

Conodonts as biostratigraphic tools for redefinition and correlation of the Cambrian–Ordovician Boundary

1988 ◽  
Vol 125 (4) ◽  
pp. 349-362 ◽  
Author(s):  
J. F. Miller
Keyword(s):  
North America ◽  
Boundary Point ◽  
Outer Part ◽  
Head Group ◽  
Eastern Canada ◽  
Green Point ◽  
Hierarchical Arrangement ◽  
Stratotype Section ◽  
Evolutionary Lineages ◽  
Zones And Subzones

AbstractThe Cambrian–Ordovician Boundary is recognized at different horizons on various continents by utilizing several fossil groups. Conodonts are abundant, diverse, and less provincial and facies-controlled than other fossils in this interval; many species are widespread and some are cosmopolitan. Strata representing the Cambrian–Ordovician Boundary interval from Asia, Australia, and North America can be correlated easily when those strata are from cratonal or shelf environments. Strata from slope facies have fewer conodonts, fewer taxa, and taxa may have different ranges compared with cratonal and shelf facies. It may be easier to correlate intercontinentally within cratonal/shelf facies than to correlate intracontinentally from cratonal/shelf facies to slope facies.A new hierarchical arrangement of conodont interval zones and subzones is proposed for western North America. These include the Proconodontus tenuiserratus Zone, the P. posterocostatus Zone (new), the P. muelleri Zone (new), the Eoconodontus Zone (new, with Eoconodontus notchpeakensis and Cambrooistodus minutus Subzones), the Cordylodus proavus Zone (emended, with Hirsutodontus hirsutus, Fryxellodontus inornatus, and Clavohamulus elongatus Subzones), the Cordylodus intermedius Zone (new, with Hirsutodontus simplex and Clavohamulus hintzei Subzones), the Cordylodus lindstromi Zone (new), and Cordylodus angulatus Zone (new).The boundary point for the base of the Ordovician System will be chosen so as to coincide with a correlatable conodont zonal boundary; other fossil groups will support correlation of this boundary point. Three alternative horizons are being considered. The base of the Cordylodus proavus Zone is the most distinctive but is regarded by some as older than is appropriate for the base of the Ordovician. The base of the Cordylodus intermedius Zone is recognizable by faunal changes in several evolutionary lineages at a level that is slightly younger than the presently recognized boundary in Australia, North America, and parts of Asia but slightly older than the base of the Tremadoc Series of Europe. The base of the C. lindstromi Zone can be recognized in most areas by the lowest occurrence of the nominate species, which is of questioned taxonomic validity and uncertain biostratigraphic utility; this horizon is closest to the base of the Tremadoc Series of Europe.Choice of a stratotype section has been narrowed to the Cow Head Group in Newfoundland, eastern Canada; and to the Fengshan and Yehli formations in Jilin Province, northeastern China. The Cow Head Group was deposited on and near the base of the continental slope. Erosion by debrisslide breccias resulted in a significant hiatus near the boundary interval in the Broom Point sections, a condition contrary to guidelines for choice of boundary sections. This may be less of a problem in other sections, such as Green Point. The Dayangcha section in China was deposited on the outer part of a continental shelf and has acritarchs, conodonts, graptolites and trilobites. Additional study of the China section is needed to document fully the ranges of critical conodont taxa.

St Audrie's Bay, Somerset, England: a candidate Global Stratotype Section and Point for the base of the Jurassic System

1994 ◽  
Vol 131 (2) ◽  
pp. 191-200 ◽  
Author(s):  
G. Warrington ◽  
J. C. W. Cope ◽  
H. C. Ivimey-Cook
Keyword(s):  
Type Locality ◽  
International Commission ◽  
The West ◽  
West Side ◽  
Type Area ◽  
Jurassic System ◽  
Stratotype Section

AbstractIn 1967 the Somerset coastline near Watchet was proposed as the type area of the basal (Planorbis) chronozone of the Hettangian Stage and thus of the Jurassic System. Neither at that time nor subsequently, however, has a type locality and section been nominated from those available in the area. There is urgent need to select a Global Stratotype Section and Point (GSSP) for the base of the Hettangian, and of the Jurassic System. The cliff forming the headland at the west side of St Audrie's Bay, three kilometres east of Watchet, Somerset, is here proposed as the type locality and section, with the base of the Hettangian Stage, at the base of the Planorbis Chronozone, being placed at the horizon currently recognized as that at which ammonites of the genus Psiloceras appear. In this section the base of the Planorbis Chronozone corresponds with the base of the Psiloceras planorbis Biozone. The proposal of this section is conditioned by the availability of comprehensive litho- and biostratigraphic information, and the ability of the section to fulfil International Commission on Stratigraphy (ICS) requirements for a candidate GSSP.

Campanian-Maastrichtian ammonite and planktonic foraminiferal biostratigraphy from Tercis, France: Implications for defining the stage boundary

1997 ◽  
Vol 71 (3) ◽  
pp. 407-418 ◽  
Author(s):  
Peter Ward ◽  
William Orr
Keyword(s):  
Planktonic Foraminifera ◽  
New Information ◽  
Biogeographic Provinces ◽  
Lower Maastrichtian ◽  
Stratotype Section ◽  
Stratigraphic Ranges ◽  
Excellent Source ◽  
Source Of Information ◽  
Reference Section ◽  
Upper Campanian

The Campanian-Maastrichtian-aged Grande Carriere quarry near Tercis, southwest France, contains a diverse and abundant assemblage of both micro-and macrofossils from a thick sequence of well-exposed limestones. Its fauna is also a mixture of both Boreal and Tethyan Province species. Because of these two traits, the quarry provides an excellent source of information about integrated biostratigraphic events among diverse taxa, as well as providing a reference section for correlation between the two biogeographic provinces. The quarry has recently been proposed as a candidate for the Campanian/Maastrichtian boundary stratotype section, while one ammonite found there, Pachydiscus neubergicus, has been proposed as the index fossil marking the base of the Maastrichtian Stage. We have made collections of Upper Cretaceous ammonites and planktonic foraminifera from limestones exposed in, and near this site, which yield new information about the relative stratigraphic ranges of Upper Campanian and Lower Maastrichtian ammonites and foraminifera.

scholarly journals The Global Stratotype Section and Point (GSSP) for the base of the Chattian Stage (Paleogene System, Oligocene Series) at Monte Cagnero, Italy

Episodes ◽  
2018 ◽  
Vol 41 (1) ◽  
pp. 17-32 ◽  
Author(s):  
Rodolfo Coccioni ◽  
Alessandro Montanari ◽  
David Bice ◽  
Henk Brinkhuis ◽  
Alain Deino ◽  
...  
Keyword(s):  
Stratotype Section

scholarly journals The Global Boundary Stratotype Section and Point (GSSP) for the base of the Hauterivian Stage (Lower Cretaceous), La Charce, southeast France

Episodes ◽  
2020 ◽  
Author(s):  
Jörg Mutterlose ◽  
Peter F. Rawson ◽  
Stéphane Reboulet ◽  
François Baudin ◽  
Luc Bulot ◽  
...  
Keyword(s):  
Lower Cretaceous ◽  
Stratotype Section

scholarly journals The Global Boundary Stratotype Section and Point (GSSP) for the base of Changhsingian Stage (Upper Permian)

Episodes ◽  
2006 ◽  
Vol 29 (3) ◽  
pp. 175-182 ◽  
Author(s):  
Yugan Jin ◽  
Yue Wang ◽  
Charles Henderson ◽  
Bruce R. Wardlaw ◽  
Shuzhong Shen ◽  
...  
Keyword(s):  
Upper Permian ◽  
Stratotype Section

scholarly journals A proposed Global Stratotype Section and Point for the base of the Viséan Stage (Carboniferous): the Pengchong section, Guangxi, South China

Episodes ◽  
2003 ◽  
Vol 26 (2) ◽  
pp. 105-115 ◽  
Author(s):  
François-Xavier Devuyst ◽  
Luc Hance ◽  
Hongfei Hou ◽  
Xianghe Wu ◽  
Shugang Tian ◽  
...  
Keyword(s):  
South China ◽  
Stratotype Section ◽  
Visean Stage

scholarly journals Global Stratotype Section and Point for base of the Ordovician System

Episodes ◽  
2001 ◽  
Vol 24 (1) ◽  
pp. 19-28 ◽  
Author(s):  
R. A. Cooper ◽  
G. S. Nowlan ◽  
S. H. Williams
Keyword(s):  
Stratotype Section

scholarly journals The Global Boundary Stratotype Section and Point (GSSP) of the Guzhangian Stage (Cambrian) in the Wuling Mountains, Northwestern Hunan, China

Episodes ◽  
2009 ◽  
Vol 32 (1) ◽  
pp. 41-55 ◽  
Author(s):  
Shanchi Peng ◽  
Loren E. Babcock ◽  
Jingxun Zuo ◽  
Huanling Lin ◽  
Xuejian Zhu ◽  
...  
Keyword(s):  
Stratotype Section
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