Results 201 to 210 of about 2,119,061 (274)

Astronomical time calibration of the Upper Devonian Lali section, South China

, 2020
The Late Devonian Period was a critical geological interval, affected by numerous significant global bio- and environmental events, including the Kellwasser, annulata and Hangenberg events, and a major climate transition leading to the Carboniferous ice ...
Kunyuan Ma, L. Hinnov, Xinsong Zhang, Y. Gong   +3 more
semanticscholar   +1 more source

A model for porosity evolution in shale reservoirs: An example from the Upper Devonian Duvernay Formation, Western Canada Sedimentary Basin

American Association of Petroleum Geologists Bulletin, 2019
The influence of thermal maturity on porosity in shale samples from the Upper Devonian Duvernay Formation is examined. The samples span a maturity range from immature to the wet gas window.
T. Dong, N. Harris, J. McMillan, Cory E. Twemlow, B. Nassichuk, D. Bish   +5 more
semanticscholar   +1 more source

Seed from the Upper Devonian

Science, 1967
We present evidence proving the existence of seeds in the Upper Devonian and extending the known age of seed plants from the Lower Carboniferous (Mississippian) into the Upper Devonian.
J M, Pettitt, C B, Beck
openaire   +2 more sources

Petrographic and Micro-FTIR Study of Organic Matter in the Upper Devonian New Albany Shale During Thermal Maturation: Implications for Kerogen Transformation

Memoir 120: Mudstone Diagenesis: Research Perspectives for Shale Hydrocarbon Reservoirs, Seals, and Source Rocks, 2019
Organic matter (OM) in petroleum source rocks is a mixture of organic macerals that follow their own specific evolutionary pathways during thermal maturation.
Bei Liu, J. Schieber, M. Mastalerz
semanticscholar   +1 more source

Organic matter accumulation in the Upper Devonian Duvernay Formation, Western Canada Sedimentary Basin, from sequence stratigraphic analysis and geochemical proxies

Sedimentary Geology, 2018
We present a model for organic carbon accumulation in the Upper Devonian Duvernay Formation of the Western Canada Sedimentary Basin, relating total organic carbon (TOC) concentrations to a high resolution geochemical and organic petrologic database and ...
N. Harris, J. McMillan, L. Knapp, M. Mastalerz   +3 more
semanticscholar   +1 more source

Spatio-temporal distribution of Leclercqia (Lycopsida), with its new discovery from the Middle to Upper devonian of Yunnan, South China

, 2020
The Devonian flora comprises abundant both endemic and widely-distributed plants and witnessed the earliest phytogeographical differentiation. One of the best studied Devonian plants, the protolepidodendralean lycopsid Leclercqia, was known to be widely ...
Honghe Xu, Yao Wang, Yan-Sen Chen, Pu Huang, Xiaole Zhang, Yi Wang, Li Qiao, Jian‐Feng Lu   +7 more
semanticscholar   +1 more source

Authigenic barite nodules and carbonate concretions in the Upper Devonian shale succession of western New York – A record of variable methane flux during burial

Marine and Petroleum Geology, 2015
Gary G Lash
exaly   +2 more sources

Diagenetic evolution of the upper Devonian phosphorites, Alborz Mountain Range, northern Iran

Sedimentary Geology, 2018
The upper Devonian, mixed siliciclastic‑carbonate stratigraphic succession of the Geirud Formation in the Alborz Mountain Range, north of Iran, hosts numerous phosphorites and phosphatic rocks. These phosphorites, which represent one of the most globally
W. Salama, Zeinab Khirekesh, A. Amini, Behnam Shafiei Bafti   +3 more
semanticscholar   +1 more source

Depositional setting, taphonomy and geochronology of new fossil sites in the Catskill Formation (Upper Devonian) of north-central Pennsylvania, USA, including a new early tetrapod fossil

Palaeogeography, Palaeoclimatology, Palaeoecology, 2018
Late Devonian terrestrial floodplain environments were important sites of plant and animal diversification and evolution. Recently discovered fossil sites in the Catskill Formation in north-central Pennsylvania yield important insights into Late Devonian
D. Broussard, J. Trop, J. Benowitz, E. Daeschler, J. Chamberlain, Rebecca B. Chamberlain   +5 more
semanticscholar   +1 more source

Summary of Upper Devonian Stratigraphy

American Midland Naturalist, 1935
The Upper Devonian terrane of New York and adjoining regions consists of many thousands of feet of clastic deposits, in the east or southeast, thinning down to but a few hundred feet at the west or northwest. Beds which are coarse sandstones, or conglomerates, at the east, grade westward into shales that grow continually finer until at length they ...
openaire   +1 more source