Results 31 to 40 of about 6,764 (250)

High resolution carbon isotope stratigraphy of the basal Silurian stratotype (Dob's Linn, Scotland) and its global correlation [PDF]

, 1997
Since its designation as the Global Stratotype Section and Point (GSSP) for the base of the Silurian System, the choice of Dob's Linn, Southern Scotland, has received criticism due to the difficulties of relating its well constrained graptolite ...
Brenchley, P.J., Crowley, S.F., Marshall, J.D., Underwood, Charlie J.   +3 more
core   +1 more source

The position of graptolites within Lower Palaeozoic planktic ecosystems. [PDF]

, 1993
An integrated approach has been used to assess the palaeoecology of graptolites both as a discrete group and also as a part of the biota present within Ordovician and Silurian planktic realms.
Allison P.A., Baker A. de C., Bates D.E.B., Beckly A.J., Bergstrom J., Berry W.B.N., Berry W.B.N., Berry W.B.N., Bjerreskov M., Brenchley, Briggs D.E.G., Bulman O.M.B., Bulman O.M.B., Bulman O.M.D., Cloud P., Colbath G.K., Conway Morris S., Conway Morris S., Conway Morris S., Conway Morris S., Conway Morris S., Cooper R.A., Crowther P.R., Crowther P.R., Elles G.L., Erdtmann B.D., Erdtmann B.D., Erdtmann B.D., Finney S.C., Fortey R.A., Fortey R.A., Fortey R.A., Fortey R.A., Gurich G., Herr S.H., Jackson D.E., Jager H., Jager H., Kemp A.E.S., Kirk N. H., Kirk N.H., Kirk N.H., Kirk N.H., Koren T.N., Kozlowski R., Kozlowski R., Koztowski R., Koztowski R., Koztowski R., Leggett J.K., Lenz A.C., Loydell D.K., Mauchline J., Nicholson H.A., Palmer D., Rickards R.B., Rickards R.B., Rickards R.B., Rickards R.B., Rickards R.B., Rickards R.B., Rigby S., Rigby S., Rigby S., Rosen B.R., Ruedemann R., Semina H.J., Sheehan P.M., Siveter D.J., Stormer L., Towe K.M., Tsudy D.M., Urbanek A., Urbanek A., Urbanek A., Walters M., Wells M.J., Whittington H.B., Williams S.H., Williams S.H., Williams S.H., Williams S.H., Williams S.H., Winston J.E., Zalasiewicz J.A., Ziegler A.M.   +85 more
core   +1 more source

Dispositional characteristics of Ordovician Wufeng Formation and Silurian Longmaxi Formation in Sichuan Basin and its adjacent areas

Petroleum Research, 2017
According to data of gas wells and typical sections of Wufeng Formation and Longmaxi Formation in Sichuan Basin, shale of various graptolite zones were analyzed to determine depositional environment, lithology and thickness characteristics of the ...
Haikuan Nie, Zhijun Jin, Xin Ma, Zhongbao Liu, Tuo Lin, Zhenheng Yang   +5 more
doaj   +1 more source

The Silurian Section of the Valle syncline (Sierra Norte de Sevilla UNESCO Global Geopark, Spain) as an International Standard for Graptolite Biostratigraphy [PDF]

Geoconservation Research, 2021
The Paleozoic succession of the Sierra Norte de Sevilla UNESCO Global Geopark (Ossa Morena Zone of the Iberian Massif, SW Spain) includes a nearly complete Silurian succession, ca. 150 m thick, deposited in an outer shelf setting. In the core part of the
Juan Carlos Gutierrez-Marco, David Loydell, Petr Storch   +2 more
doaj   +1 more source

Silurian graptolite biostratigraphy of the Röstånga-1 drill core, Scania:a standard for southern Scandinavia [PDF]

, 2014
The Rostanga-1 core from west-central Scania provides the most complete succession of the Sandbian (Upper Ordovician) through lower Telychian (Silurian, Llandovery) strata of southern Scandinavia. The Hirnantian is identified in the Kallholn Formation by
Ahlberg, Per, Loydell, David Kendrick, Maletz, Jörg, Suyarkova, Anna   +3 more
core   +2 more sources

New Ludlovian, upper Silurian, graptolite faunas from the Los Espejos Formation, Central Precordillera, San Juan Province, Argentina: correlations and biostratigraphic remarks [PDF]

Acta Palaeontologica Polonica
Graptolites represent one of the most important index fossils for the lower to middle Paleozoic biostratigraphy worldwide. Compared to other regions, graptolite faunas exhibited a marked decrease in diversity in Argentina during the Silurian, what ...
FERNANDO E. LOPEZ, OSVALDO A. CONDE, ALEJANDRO R. BRAECKMAN, DIEGO G. SEGURA, JUAN M. DROVANDI, ANDREA J. BUENO, ULISES ABARCA   +6 more
doaj   +1 more source

Integration of Darriwilian (Middle Ordovician) δ13Corg chemostratigraphy with graptolite biostratigraphy in the classical Röstånga area in northwestern Scania (southern Sweden) [PDF]

Estonian Journal of Earth Sciences, 2020
The largely covered Middle Ordovician succession in the classic geological Röstånga area in northwestern Scania has not been studied for some 80 years.
Stig M. Bergström, Per Ahlberg, Jörg Maletz, Frans Lundberg, Michael M. Joachimski   +4 more
doaj   +1 more source

General geology and geochemistry of the Lokpanta Formation oil shale, Nigeria [PDF]

Oil Shale, 2021
A detailed geochemical and mineralogical study was carried out on the Lokpanta oil shale (OS), Nigeria. Samples from three drill cores and several outcrops were studied in order to understand OS general geochemistry and reconstruct tectonic and ...
Sylvester Ofili, Alvar Soesoo
doaj   +1 more source

Carbon isotope chemostratigraphy of the Llandovery in northern peri-Gondwana: new data from the Barrandian area, Czech Republic [PDF]

Estonian Journal of Earth Sciences, 2014
The first complete δ13Corg record of the uppermost Hirnantian to lower Telychian strata of the Barrandian area (northern peri-Gondwana) is presented based on 168 new samples.
Jiří Frýda, Petr Štorch
doaj   +1 more source

Lower Wenlock black shales in the northern Holy Cross Mountains, Poland: Sedimentary and geochemical controls on the Ireviken Event in a deep marine setting [PDF]

, 2016
The stratigraphic variability and geochemistry of Llandovery/Wenlock (L/W) Series boundary sediments in Poland reveals that hemipelagic sedimentation under an anoxic/euxinic water column was interrupted by low density bottom currents or detached diluted ...
Bond, David P. G., Marynowski, Leszek, Smolarek, Justyna, Trela, Wiesław   +3 more
core   +1 more source