Results 51 to 60 of about 58,643 (272)

Linking the progressive expansion of reducing conditions to a stepwise mass extinction event in the late Silurian oceans

Geology, 2019
The late Ludlow Lau Event was a severe biotic crisis in the Silurian, characterized by resurgent microbial facies and faunal turnover rates otherwise only documented during the “big five” mass extinctions.
Chelsie N. Bowman, Seth A. Young, D. Kaljo, M. Eriksson, T. Them, O. Hints, T. Martma, J. Owens   +7 more
semanticscholar   +1 more source

Model for the Formation of Single‐Thread Rivers in Barren Landscapes and Implications for Pre‐Silurian and Martian Fluvial Deposits

Journal of Geophysical Research: Earth Surface, 2019
Flume experiments and field observations show that bank vegetation promotes the formation of narrow and deep single‐thread channels by strengthening riverbanks.
M. Lapôtre, A. Ielpi, M. Lamb, Rebecca M. E. Williams, A. Knoll   +4 more
semanticscholar   +1 more source

A summary and revision of the East Baltic Silurian chitinozoan biozonation [PDF]

Estonian Journal of Earth Sciences, 2012
The biostratigraphical data on the East Baltic Silurian chitinozoans are summarized. Based on the study of nine East Baltic drill cores, 28 regional chitinozoan zonal units, including 26 biozones and 2 interzones, are briefly characterized. In comparison
Viiu Nestor
doaj   +1 more source

Features of facies of reefs of the silurian age of Volyn-Podillia

Мінеральні ресурси України, 2021
On the territory of Volyn-Podillya Silurian deposits are represented by thick strata of terrigenous and carbonate deposits, they are mainly represented by marls, argillites, limestones, dolomites, etc.
T. V. Sushko
doaj   +1 more source

Graptolites from Silurian (Llandovery Series) sedimentary deposits attributed to a forearc setting, Co To Formation, Co To archipelago, northeast Vietnam [PDF]

, 2020
Newly collected graptolites from the Co To Formation, Co To archipelago, NE Vietnam, comprise assemblages indicative of two biostratigraphical levels within the lower Silurian, Llandovery Series, Telychian Stage: the co-occurrence of Spirograptus ...
Doan, Hung Dinh, Komatsu, Toshifumi, Nguyen, Hung, Nguyen, Minh Trung, Rushton, Adrian, Saparin, Muhammad Aqqid, Trinh, Ha Thai, Vandenbroucke, Thijs, Williams, Mark, Zalasiewicz, Jan   +9 more
core   +1 more source

A Bayesian classification model to reconstruct lifetime movement patterns of riverine fish using environmental tracers

Methods in Ecology and Evolution, EarlyView.
Abstract Environmental tracers, including both elemental concentrations and isotope ratios, are widely used to reconstruct the movement patterns of animals throughout landscapes. The methodology involves creating a map that describes the distribution of the environmental tracer across the landscape, an isoscape and then matching the values of the same ...
Michael P. Venarsky, Edward L. Boone, Ben Stewart‐Koster, David A. Crook, Kaitlyn O'Mara, Jon Woodhead, Roland Maas, Stuart Bunn   +7 more
wiley   +1 more source

Petrographical Analysis of Warthian Fuvioglacial Gravels as a Tool to Trace the Source Area – A Case Study From Central Poland [PDF]

, 2014
The petrographical features of the medium- and coarse-grained gravels (4-10 mm and 20-60 mm, respectively) of weathered and fresh (unweathered) deposits indicate, in combination with so-called indicator and statistical erratics, that two glacial lobes ...
Górska-Zabielska, Maria, Wachecka-Kotkowska, Lucyna   +1 more
core   +2 more sources

Thorncliffe Formation: A proglacial to subglacial lacustrine basin sequence, Greater Toronto Region, Canada

Boreas, EarlyView.
Map of Lower sediment (LS) thickness is a surrogate for the distribution of Thorncliffe Formation (TF) and ~75% of TF thickness from the slope of Niagara Escarpment east to Brighton. Inset images show the LS sequence at the Don Valleys brickyards (DVBY) and undeformed TF sand and gravel (~15 m) below Newmarket Till (NT) at sites L and Co.
David R. Sharpe, Charles E. Logan, Ross D. Knight, Andre J.‐M. Pugin   +3 more
wiley   +1 more source

Evolution of leaf-form in land plants linked to atmospheric CO2 decline in the Late Palaeozoic era [PDF]

, 2001
The widespread appearance of megaphyll leaves, with their branched veins and planate form, did not occur until the close of the Devonian period at about 360 Myr ago.
AH Knoll, C. P. Osborne, CI Mora, D Edwards, D Edwards, D. J. Beerling, DJ Beerling, DJ Beerling, DJ Beerling, DJ Beerling, FI Woodward, G Bowes, GD Farquhar, GD Farquhar, JC McElwain, KJ Niklas, LA Martinelli, P Kenrick, PG Gensel, PG Gensel, PJ Schulte, PJ Valdes, PS Nobel, RA Berner, RA Berner, S Von Caemmerer, SG Hao, TJ Algeo, W Larcher, W Zimmermann, W. G. Chaloner, WG Chaloner, WG Chaloner   +32 more
core   +1 more source

Determining impact angle from the spatial distribution of shock metamorphism: A case study of the Gosses Bluff (Tnorala) impact structure, Australia

Meteoritics &Planetary Science, EarlyView.
Abstract The majority of planetary impacts occur at oblique angles. Impact structures on Earth are commonly eroded or buried, rendering the identification of the direction and angle of impact—using methods such as asymmetries in ejecta distribution, surface topographic expression, central uplift structure, and geophysical anomalies—challenging. In this
Eloise E. Matthews, Auriol S. P. Rae, Thomas Kenkmann, Nicholas E. Timms, Aaron J. Cavosie, Marian B. Holness   +5 more
wiley   +1 more source