Ordovician graptolites from the basal part of the Palaeozoic transgressive sequence in the Karadere area, Zonguldak Terrane, NW Turkey [PDF]
Estonian Journal of Earth Sciences, 2014 The Karadere area to the east of Safranbolu in NW Anatolia is one of the very few localities in Turkey where the contact between the Cadomian basement and the Lower Palaeozoic transgressive succession is well exposed.
M. Cemal Göncüoglu +3 more
doaj +1 more source
High‐Resolution Tracking of Baltica's Northward Drift in the Ordovician
Geophysical Research Letters, Volume 52, Issue 7, 16 April 2025.Abstract We investigated the paleogeography of Baltica via a paleomagnetic study of 471‐454 Ma limestones from the Siljan (Sweden) impact structure. Stepwise thermal demagnetization isolated a well‐defined magnetization component that unblocks up to the Curie temperature of magnetite and passes fold and reversal tests, indicative of a primary ...
Nastaran Ahanin, Stuart A. Gilder
wiley +1 more source
Graptolite biostratigraphy of the lower Silurian of the Sommerodde-1 core, Bornholm, Denmark
, 2017 The Sommerodde-1 core provides a continuous record through the subsurface of southern Bornholm from the Wenlock Series (Silurian) through to the Lower Cambrian. The Silurian graptolite biostratigraphy of the core is described.
D. K. Loydell +3 more
semanticscholar +1 more source
Journal of Natural Gas Geoscience, 2018 The graptolitic shale of the Wufeng–Longmaxi Formations is widely deposited across the Ordovician and Silurian transition in South China, which is the target of shale gas exploration and development within China.
Zhen Qiu +9 more
semanticscholar +1 more source
Petroleum Research, 2017 To further understand shale reservoir characteristics of Wufeng Formation and Longmaxi Formation in the Wuxi area, northeast Chongqing, based on drilling data of Well WX2, and taking the graptolite biostratigraphy as the standard marker of stratigraphic ...
Jin Wu +9 more
doaj +1 more source
Middle Darriwilian conodont zones in the uppermost San Juan limestone and the lower member of the Las Aguaditas formation, central Precordillera of San Juan, Argentina [PDF]
, 2013 The geological province of Precordillera is located in western Argentina. It extends 450 km meridionally and 110 km from east to west (Fig. 1) (Furque and Cuerda, 1979).
Albanesi, Guillermo Luis +2 more
core
The Depositional Record, Volume 11, Issue 1, Page 22-43, February 2025.Exceptional outcrop exposures of the Cloridorme Formation, Quebec, Canada, offer a rare opportunity to quantify the lateral continuity of event beds and elements of a basin‐plain depositional environment. Eighty‐two per cent of the mapped event beds are present across a 530 m outcrop transect parallel to depositional dip. However, even in this overall ‘
Zane Jobe +4 more
wiley +1 more source
Correlation of upper Llandovery–lower Wenlock bentonites in the När (Gotland, Sweden) and Ventspils (Latvia) drill cores: role of volcanic ash clouds and shelf sea currents in determining areal distribution of bentonite [PDF]
, 2012 Study of volcanic ash beds using biostratigraphy, sanidine composition and immobile elements within bentonites has manifested several well-established and some provisional correlations between Gotland and East Baltic sections.
Tarmo Kiipli +2 more
core +1 more source
Late Ordovician ironstone and its relation to ocean redox instability, climate and glaciation
Sedimentology, Volume 72, Issue 2, Page 631-665, February 2025.Abstract The Upper Ordovician (Katian) Neda Formation, a phosphatic ironstone, records a widespread but short‐lived shift to ferruginous waters across a vast epicontinental area. Lithofacies and stratigraphic reappraisal indicate that Neda ironstone deposition occurred on a storm‐dominated ramp when coastal upwelling emplaced eutrophic ferruginous ...
Edward J. Matheson +3 more
wiley +1 more source
Stratigraphical framework for the Ordovician and Silurian sedimentary strata of northern England and the Isle of Man [PDF]
, 2012 This report provides a comprehensive review of the lithostratigraphy of the Ordovician and Silurian sedimentary, excluding volcaniclastic, strata within the Lake District Lower Palaeozoic Inlier, the nearby northern England inliers of Cross Fell ...
Millward, D., Stone, P.
core