Results 81 to 90 of about 1,764 (217)

Bioturbators as ecosystem engineers in space and time

Palaeontology, Volume 67, Issue 6, November/December 2024.
Abstract Biogenic sedimentary structures offer a unique perspective for understanding the role of the biosphere in the interaction with other Earth subsystems and the building up of our planet. The record of their ancient equivalents provides a wealth of information for reconstructing the role of bioturbators as ecosystem engineers using multiple ...
M. Gabriela Mángano, Luis A. Buatois, Nicholas J. Minter, Romain Gougeon   +3 more
wiley   +1 more source

Miospore assemblages from Late Ordovician (Katian-Hirnantian), Ghelli Formation, Alborz Mountain Range North-eastern Iran: Palaeophytogeographic and palaeoclimatic implications [PDF]

Journal of Sciences, Islamic Republic of Iran, 2016
Well-preserved miospore assemblages are recorded from the Late Ordovician (Katian-Hirnantian), Ghelli Formation in Pelmis-gorge at the north-eastern Alborz Mountain The palynomorphs were extracted from siliciclastic deposits which are well-dated by using
M. Ghavidel-syooki
doaj  

Composition and significance of the Katian (Upper Ordovician) conodont fauna of the Vaux Limestone (‘Calcaire des Vaux’) in Normandy, France [PDF]

Estonian Journal of Earth Sciences, 2014
Study of new conodont collections from the Vaux Limestone exposed at its classical locality at Saint-Hilaire-la-Gérard in the Sées syncline, the conodont fauna of which was previously described in a preliminary way by Weyant et al.
Annalisa Ferretti, Andrea Messori, Stig M. Bergström   +2 more
doaj   +1 more source

The only known cyclopygid–‘atheloptic’ trilobite fauna from North America: the upper Ordovician fauna of the Pyle Mountain Argillite and its palaeoenvironmental significance [PDF]

, 2012
The trilobite fauna of the upper Ordovician (middle Katian) Pyle Mountain Argillite comprises a mixture of abundant mesopelagic cyclopygids and other pelagic taxa and a benthic fauna dominated by trilobites lacking eyes.
Adrain, ALAN W. OWEN, Angelin, Apollonov, Barrande, Bartholomew, Bergström, Beyrich, Boucot, Bruton, Brøgger, Budil, Cocks, Cocks, Cooper, Dalman, DAVID L. BRUTON, Dean, Dean, Dean, Fortey, Fortey, Fortey, Fortey, Fortey, Fortey, Gürich, Hammann, Hammann, Hammann, Hansen, Hawle, Horný, Hörbinger, Ingham, Ingham, Ingham, Jaekel, Jell, Ji, Kaesler, Kielan, Kielan, Kobaysahi, Kolobova, Kozák, Krueger, Kutorga, Lane, Lespérance, Lespérance, Linnarsson, Lu, Lu, M'Coy, Marek, Marek, McCormick, Morris, Nicholson, Nicholson, Nielsen, Nielsen, Owen, Owen, Owen, Owen, Owen, Owen, Parkes, Pek, Pek, Prantl, Price, Přibyl, Raymond, Reed, Reed, Reed, Reed, Repina, Rong, Ross, Roy, Salter, Schrank, Shaw, Shaw, Sheehan, Shergold, Shergold, Thomas, Volborth, Warburg, Weir, Whittard, Whittard, Whittington, Whittington, Whittington, Whittington, Whittington, Whittington, Whittington, Zhou, Zhou, Zhou, Zhou, Zhou, Zhou, Zhou, Zhou, Šnajdr   +112 more
core   +1 more source

Late Ordovician and early Silurian virgianid and stricklandioid brachiopods from North Greenland: implications for a warm‐water faunal province

Papers in Palaeontology, Volume 10, Issue 1, January/February 2024.
Abstract An unusually rich and diverse suite of virgianid brachiopods, hitherto poorly known, is systematically described here for the first time from the Ordovician–Silurian boundary interval (late Katian – Aeronian) of North Greenland. The Late Ordovician virgianids comprise typical taxa of the warm‐water Tcherskidium fauna (e.g.
Jisuo Jin, Christian M. Ø. Rasmussen, Peter M. Sheehan, David A. T. Harper   +3 more
wiley   +1 more source

The Upper Ordovician of Estonia: facies, sequences, and basin development [PDF]

Estonian Journal of Earth Sciences
Sequence stratigraphic analysis of the Nabala–Porkuni regional stages (RSs; upper Katian–Hirnantian) of Estonia clarifies the Late Ordovician evolution of the Estonian Shelf–Livonian Basin.
Mark T. Harris, Leho Ainsaar, Linda Hints, Peep Männik, Tõnu Meidla, Jaak Nõlvak, Tory Schultz, Peter M. Sheehan   +7 more
doaj   +1 more source

A new method for predicting the shale distribution of the Wufeng Formation in the Upper Yangtze Region, China

BSGF - Earth Sciences Bulletin, 2020
Taking the Late Ordovician Wufeng Formation (WFF) shale in the Upper Yangtze region as an example, we conducted a lithofacies distribution, thickness quantification, and paleo-topographic reconstruction of the Late Ordovician graptolite zones ...
Sun Shasha, Zhang Linna, Wang Hongyan, Dong Dazhong, Zhang Rong   +4 more
doaj   +1 more source

Distribution of the order Proetida (Trilobita) in Baltoscandian Ordovician strata [PDF]

, 2009
The trilobite order Proetida forms a minor but important faunal element within the Ordovician strata of Baltoscandia. This review follows the current systematic, taxonomic, and stratigraphical usage and discusses the distribution of these trilobites ...
Owens, Robert M., Popp, Adrian, Pärnaste, Helje   +2 more
core  

Orbital and Millennial‐Scale Cycles Through the Hirnantian (Late Ordovician) in Southern China

Geochemistry, Geophysics, Geosystems, Volume 25, Issue 1, January 2024.
Abstract The Hirnantian period, making the end of the Ordovician with significant mass extinctions and large ice‐sheets, is a critical interval for studying paleoclimate variations. This research represents the first cyclostratigraphic study of this period, utilizing high‐resolution (1 mm sampling rate) geochemical data from the ∼7‐m thick SH‐1 drill ...
Siding Jin, Haiyang Cao, Mingcai Hou, Jiawei Wang, Chao Ma, Yu Liu   +5 more
wiley   +1 more source

The search for ‘hot shales’ in the western Kufra Basin, Libya: geochemical and mineralogical characterisation of outcrops, and insights into latest Ordovician climate [PDF]

, 2015
Across the Saharan platform, mudrocks of latest Ordovician–Silurian age (the Tanezzuft Formation) are a major source rock interval for Palaeozoic petroleum systems, but source rock quality is variable and difficult to predict.
Abutarruma, Y, Elgadry, M, Le Heron, DP, Meinhold, G   +3 more
core   +1 more source