Results 51 to 60 of about 46,008 (233)

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

The effect of early diagenetic processes on the quantification of fossil micrometeorite abundance and flux in the geological record

Meteoritics &Planetary Science, EarlyView.
Abstract Fossil micrometeorites (MMs) recovered from lithified sedimentary rocks, particularly iron‐rich (I‐type) cosmic spherules (CSs) provide valuable insights into past dust‐forming events. Their abundances, when combined with estimates of local sedimentation rates can be used to reconstruct the flux of extraterrestrial dust.
Isabelle S. Mattia, Matthew J. Genge, Martin D. Suttle   +2 more
wiley   +1 more source

Conodont biostratigraphy of the Crawford Group, Southern Uplands, Scotland [PDF]

, 2002
Extensive new conodont collections from the Crawford Group, the oldest succession in the Southern Uplands of Scotland, support the previously documented biostratigraphical ages for the included formations.
Armstrong, Howard A., Barron, Hugh F., Floyd, James D., Tingqing, Lu   +3 more
core   +1 more source

Microbially generated ferruginous crusts: A potential biosignature of continental input in coastal settings

Sedimentology, EarlyView.
ABSTRACT Thin ferruginous sandy crusts are common on top of sandstone beds in the Early Permian post‐glacial deposits of the Paraná Basin in southern Brazil. These crusts usually preserve wrinkle structures, suggesting that they might be a product of microbial mediation.
Patrícia Weschenfelder, Renata Guimarães Netto, Alisson Klayton Martins   +2 more
wiley   +1 more source

An updated correlation of the Silurian strata in Estonia [PDF]

Estonian Journal of Earth Sciences
The correlation of the Silurian succession of Estonia with the global standard has long been considered reliable. However, new information, particularly on the distribution of microfossils, has changed our understanding of the Silurian stratigraphy in ...
Peep Männik, Tõnu Meidla, Olle Hints
doaj   +1 more source

Bryozoan–cnidarian mutualism triggered a new strategy for greater resource exploitation as early as the Late Silurian

Scientific Reports, 2022
Bryozoans were common benthic invertebrates in the Silurian seas. The large biodiversity among Silurian benthic organisms prompted diversified interactions, and as a result bryozoans hosted many other organisms as symbionts.
Mikołaj K. Zapalski, Olev Vinn, Ursula Toom, Andrej Ernst, Mark A. Wilson   +4 more
doaj   +1 more source

Considering the Case for Biodiversity Cycles: Reexamining the Evidence for Periodicity in the Fossil Record [PDF]

, 2007
Medvedev and Melott (2007) have suggested that periodicity in fossil biodiversity may be induced by cosmic rays which vary as the Solar System oscillates normal to the galactic disk.
AB Smith, Adrian L. Melott, AG Fischer, AG Fischer, AI Miller, AW Grabau, Bruce S. Lieberman, CL Camp, DM Raup, DM Raup, ES Vrba, FO Brigham, G Ding, GG Simpson, J Alroy, JA Van Dam, JD Scargle, JJ Sepkoski Jr, JJ Sepkoski Jr, JL Cornette, JL Cornette, JM Adrain, John Hawks, JW Kirchner, JW Kirchner, JW Kirchner, LG Henbest, M Foote, M Foote, M Omerbashich, MJ Benton, ML Droser, MV Medvedev, N Eldredge, ND Newell, ND Newell, NL Gilinsky, P Laguna, PJ Lu, RA Muller, RA Rohde, RA Rohde, RE Plotnick, RK Bambach, S Peters   +44 more
core   +5 more sources

Geochemical features of the Lower Silurian strata in Xiushan, Chongqing: Implications for paleoclimate reconstruction

Journal of Asian Earth Sciences: X
The Silurian was featured by frequent climatic and environmental changes. Impoverished marine faunas slowly recovered from the end-Ordovician mass extinction.
La Zhang, Yang Chen, Jinhua Luan, Ruigang Zhang, Zhiwei Cui, Haitong Zhao, Qian Wang   +6 more
doaj   +1 more source

Evidence of micro-continent entrainment during crustal accretion [PDF]

, 2015
Peer ...
Bodin, T., Cayley, R. A., Direen, N. G., Musgrave, R., Pilia, S., Rawlinson, N., Reading, A. M., Young, M. K.   +7 more
core   +1 more source

High resolution carbon isotope stratigraphy of the basal Silurian stratotype (Dob's Linn, Scotland) and its global correlation [PDF]

, 1997
Since its designation as the Global Stratotype Section and Point (GSSP) for the base of the Silurian System, the choice of Dob's Linn, Southern Scotland, has received criticism due to the difficulties of relating its well constrained graptolite ...
Brenchley, P.J., Crowley, S.F., Marshall, J.D., Underwood, Charlie J.   +3 more
core   +1 more source