Distribution pattern of the Ordovician black shale constrained by graptolite zonation in the western margin of the Ordos Block, North-West China [PDF]
Estonian Journal of Earth Sciences, 2023 The graptolitic shale from the late Middle to early Late Ordovician along the western margin of the Ordos Block is a good target bed for shale gas exploration.
Chuanshang Wang, Yong Hu
doaj +1 more source
LOWER TO MIDDLE ORDOVICIAN ACRITARCHS AND CHITINOZOANS FROM NORTHERN KARAKORUM MOUNTAINS, PAKISTAN
Rivista Italiana di Paleontologia e Stratigrafia, 2000 The lower Vidiakot section (Chitral, Pakistan) comprises the lower part (Yarkhun Formation and the base of the Vidiakot Formation) of the terrigenous complex transgressively overlying the crystalline basement of Northern Karakorum.
MARCO QUINTAVALLE +2 more
doaj +1 more source
A multi-dimensional dataset of Ordovician to Silurian graptolite specimens for virtual examination, global correlation, and shale gas exploration [PDF]
Earth System Science Data, 2023 Multi-elemental and multi-dimensional data are more and more important in the development of data-driven research, as is the case in modern paleontology, in which, in an examination by experts, or some day artificial intelligence, every fossil specimen ...
H.-H. Xu +12 more
doaj +1 more source
The stratigraphy, correlation, provenance and palaeogeography of the Skiddaw Group (Ordovician) in the English Lake District [PDF]
, 1995 A new lithostratigraphy is presented for the Skiddaw Group (lower Ordovician) of the English Lake District. Two stratigraphical belts are described. Five formations are defined in the Northern Fells Belt, ranging in age from Tremadoc to early Llanvirn.
Cooper, A.H. +5 more
core +1 more source
Age of the Kalana Lagerstätte, early Silurian, Estonia [PDF]
Estonian Journal of Earth Sciences, 2016 The Kalana quarry in central Estonia is known for its exceptionally well-preserved non-calcified algal and other fossils. The interval with the fossil Konservat Lagerstätte in the Kalana section has previously been tentatively dated as early Aeronian ...
Peep Männik +3 more
doaj +1 more source
Variation of Organic Pore Structure With Maceral Types in the Longmaxi Shale, Sichuan Basin
Frontiers in Earth Science, 2021 Organic matter (OM), composed of various macerals, has a strong influence on the enrichment of shale gas. Nevertheless, the connection between OM-hosted pore structure and maceral type is not yet fully understood because of the difficulty to identify the
Qian Pang +7 more
doaj +1 more source
Advances in the Ordovician graptolite biostratigraphy of the St Petersburg area, Russia [PDF]
, 2009 The Ordovician shallow-water shelf deposits rich in benthic fauna are exposed along the Russian part of the Baltic–Ladoga Klint. Graptolites occur only at some stratigraphic levels, being comparatively numerous in marls and clays and very rare in ...
Koren,Tatyana N., Suyarkova, Anna A.
core +1 more source
Shiyou shiyan dizhi, 2020 The Wufeng-Longmaxi shale in the Sichuan Basin is the only stratum in China to realize commercial development of shale gas. There are some differences in shale gas generation and a lack of direct experimental evidence of the reasons for these differences.
Zhongliang MA +5 more
doaj +1 more source
Polymorphic organization in a planktonic graptoloid (Hemichordata: Pterobranchia) colony of Late Ordovician age [PDF]
, 2012 Graptolites are common fossils in Early Palaeozoic strata, but little is known of their soft-part anatomy. However, we report a long-overlooked specimen of Dicranograptus aff.
Howe, Michael P.A. +6 more
core +2 more sources
High resolution conodont-graptolite biostratigraphy in the Middle-Upper Ordovician of the Sierra de La Invernada Formation (Central Precordillera, Argentina) [PDF]
, 2008 Outcrops on the western slope of the La Invernada Range, San Juan Precordillera (W Argentina), were surveyed for lithofacial analysis and graptolite-conodont high resolution biostratigraphy.
Albanesi, G. L., +3 more
core +3 more sources