Results 61 to 70 of about 9,274 (231)

A pelagic Upper Devonian sequence in Sariyer, Istanbul [PDF]

, 2020
The Palaeozoic sequence in the Istanbul region is made up of a continuous transgressive sedimentary series extending from Ordovician continental clastic rocks to Lower Carboniferous turbidites.
Okay, Aral, Atakul-Ozdemir, Ayşe
core   +1 more source

Rise of the earliest tetrapods: an early Devonian origin from marine environment. [PDF]

PLoS ONE, 2011
Tetrapod fossil tracks are known from the Middle Devonian (Eifelian at ca. 397 million years ago--MYA), and their earliest bony remains from the Upper Devonian (Frasnian at 375-385 MYA).
David George, Alain Blieck
doaj   +1 more source

Araguainha Dome, Brazil: A polygonal impact structure due to a complex pre‐impact regional structural framework

Meteoritics &Planetary Science, EarlyView.
Abstract We investigated the structural framework of the north–northwestern Paraná Basin in Brazil to test whether the pre‐impact structures in this region may have had any influence on the first‐order formation and morphostructure of the Araguainha impact structure (AIS).
Renato B. Bernardes, Wolf U. Reimold, Roger L. Gibson, Julia B. Curto Ma, Adolfo B. Silva, Natalia Hauser   +5 more
wiley   +1 more source

Lithofacies palaeogeography as a guide to petroleum exploration

Journal of Palaeogeography, 2013
Lithofacies palaeogeography as a guide to petroleum exploration is a very important topic. By using the following five exploration examples, this paper discusses the guide of lithofacies palaeogeography or of sedimentary facies to petroleum exploration ...
Feng Zengzhao, Bao Hongping, Jia Jinhua, Wang Yigang, Deng Xiuqin   +4 more
doaj   +1 more source

Middle to Late Devonian–Carboniferous collapse basins on the Finnmark Platform and in the southwesternmost Nordkapp basin, SW Barents Sea [PDF]

Solid Earth, 2018
The SW Barents Sea margin experienced a pulse of extensional deformation in the Middle–Late Devonian through the Carboniferous, after the Caledonian Orogeny terminated.
J.-B. P. Koehl, J.-B. P. Koehl, S. G. Bergh, S. G. Bergh, T. Henningsen, J. I. Faleide, J. I. Faleide   +6 more
doaj   +1 more source

Revisiting the Hummeln structure, Sweden—A shallow marine Cambrian impact structure

Meteoritics &Planetary Science, EarlyView.
Abstract Hummeln is a simple impact structure located in south‐eastern Sweden. It is approximately 1.2 km in diameter and almost completely covered by a lake. Here, we present the first detailed investigation of impactites and mapping of the 164.25 m deep drill core Hummeln‐1 with a focus on impact metamorphism and the impact process.
S. Alwmark, J. Granbom, P. Ahlberg, M. Calner, S. Richoz, K. J. Gajewska, W. R. Hyde, K. Ljung, C. Alwmark   +8 more
wiley   +1 more source

Paleozoic Tectonic Setting and Paleogeographic Evolution of the Qin‐Fang Region, Southern South China Block: Detrital Zircon U‐Pb Geochronological and Hf Isotopic Constraints

Geochemistry, Geophysics, Geosystems, 2018
The thick Silurian siliciclastic sedimentary rocks in the Qin‐Fang region contrasting with their absence in surrounding regions have long been an enigma for the early Paleozoic geology of South China. Here we employ detrital zircon U‐Pb geochronology and
Xinchang Zhang, Yuejun Wang, Peter D. Clift, Yi Yan, Yuzhi Zhang, Le Zhang   +5 more
doaj   +1 more source

The Ames impact structure, Oklahoma: New radioisotopic constraints and implications for North American impact chronology

Meteoritics &Planetary Science, EarlyView.
Abstract The Ames impact structure (Oklahoma) is thought to have formed during the Ordovician Meteor Event, based on conodont biostratigraphy of its crater fill. Here, U–Pb zircon dates from its impact‐melt portion, conducted using secondary ion mass spectrometry and laser ablation–inductively coupled plasma–mass spectrometry (n = 37 spots), yield a ...
Elizabeth J. Catlos, Andrew F. Parisi, Michael E. Brookfield, Timmons Erickson, Sean P.S. Gulick, Axel K. Schmitt, Daniel F. Stockli, Daniel P. Miggins, Ben Ruchte, Mark Cloos   +9 more
wiley   +1 more source

Diagenetic paragenesis of Swan Hills carbonates (Middle-Upper Devonian) in the Devonian Deep Basin of west-central Alberta

, 1994
Petrographic analyses of Swan Hills carbonates (Middle-Upper Devonian) from the deeply buried subsurface (2500-4000 m) of west-central Alberta indicate that these carbonates underwent diagenesis in submarine and subsurface environments, without significant modifications from shallow, meteoric waters.
H Qing, J Wendte
openaire   +1 more source

Recognition of fossil keratose sponges in carbonates using petrographic and machine‐learning classification

Sedimentology, EarlyView.
ABSTRACT Filamentous, anastomosing spar‐filled networks in Phanerozoic carbonates have been interpreted as the mineralised remains of keratose (non‐spiculate) sponges, yet their recognition remains contested because fabrics of broadly similar appearance may arise from microbial, diagenetic or physical processes. This study combines direct fossil–modern
Jeong‐Hyun Lee, Seung‐Sep Kim, Cui Luo   +2 more
wiley   +1 more source