Results 11 to 20 of about 8,428 (209)

Characterization and ecological significance of a seed bank from the Upper Pennsylvanian Wise Formation, southwest Virginia

open access: yesActa Palaeobotanica, 2017
Soil seed banks are important to the maintenance and restoration of floras. Extant seed banks exhibit unique characteristics with regard to the distribution of seed size and seed density.
PETRA S. YEHNJONG   +2 more
doaj   +2 more sources

UPPER CARBONIFEROUS (PENNSYLVANIAN) CONODONTS FROM SOUTH GUIZHOU OF CHINA

open access: yesRivista Italiana di Paleontologia e Stratigrafia, 2003
This paper describes in detail che conodont sequence of che Upper Carboniferous (Pennsylvanian) and the upper and lower boundaries in this interval at the Nashui section in Luodian, South Guizhou. The following 23 conodont zones, in descending order, can
WANG ZHIHAO, QI YUPING
doaj   +2 more sources

The revision of baphetids from the Middle Pennsylvanian of the Czech Republic: Morphology, ontogeny, palaeoecology, and the reassessment of the phylogeny of Baphetoidea. [PDF]

open access: yesAnat Rec (Hoboken)
Abstract The baphetoids represent a clade of the Carboniferous stem‐tetrapods (Middle Mississippian—Middle Pennsylvanian) with a characteristic extension of the orbits into antorbital vacuities, which formed keyhole‐shaped openings on the skull. The more derived baphetids were crocodile‐like piscivores frequently occurring in coal‐bearing lacustrine ...
Barták P, Ivanov M, Ekrt B.
europepmc   +2 more sources

Reproduction on the Rocks: Life History of a Freshwater Macrobioeroding Bivalve. [PDF]

open access: yesEcol Evol
ABSTRACT Macrobioerosion, the excavation and removal of consolidated mineral substrates by macrofauna, is well established in marine systems, where macrobioeroders drive carbonate cycling, sediment production and habitat formation. In freshwater ecosystems, however, it has been documented in only a small number of invertebrate taxa and remains a poorly
Shipway JR, Distel DL.
europepmc   +2 more sources

Permian Large Igneous Provinces and Their Paleoenvironmental Effects

open access: yesGeophysical Monograph Series, Page 417-434., 2021

Exploring the links between Large Igneous Provinces and dramatic environmental impact

An emerging consensus suggests that Large Igneous Provinces (LIPs) and Silicic LIPs (SLIPs) are a significant driver of dramatic global environmental and biological changes, including mass extinctions.
Jun Chen, Yi‐Gang Xu
wiley  

+1 more source

First xenacanthid shark from the Pennsylvanian (Moscovian) of the Northern Caucasus (Russia) [PDF]

open access: yesFossil Record, 2007
The occurrence of Triodus teberdaensis n. sp. teeth from the Pennsylvanian Tolstiy Bugor Formation (Moscovian) of Karachay-Cherkess Republic is the first evidence of xenacanthid remains from the Caucasus.
O. Hampe, A. Ivanov
doaj   +5 more sources

A new species of leafy calamite stem from the Pennsylvanian (Bolsovian) of the South Wales Coalfield

open access: yesActa Palaeobotanica, 2020
Large leafy calamite stems are very rare in the fossil record. One such leafy stem is described as a new species, Calamites cambrensis, from shales above the No 2 Rhondda Seam in the Bolsovian of the South Wales Coalfield.
Barry A. Thomas
doaj   +1 more source

Debate on human aging and lifespan [PDF]

open access: yesBioImpacts, 2017
The issue of human lifespan has long been a matter of controversy among scientists. In spite of the recent claim by Dong et al that human lifespan is limited to 115 years, with the mounting improvements in biotechnology and scientific understanding of ...
Mohammad A. Rafi, Abass Alavi
doaj   +1 more source

Early Pennsylvanian Odonatoptera from the Xiaheyan locality (Ningxia, China): new material, taxa, and perspectives [PDF]

open access: yesFossil Record, 2013
Data on Odonatoptera species from the Xiaheyan locality (Ningxia, China; Early Pennsylvanian) described so far are complemented based on abundant new material. Several taxonomic and nomenclatural adjustments are proposed.
Y. Li, O. Béthoux, H. Pang, D. Ren
doaj   +5 more sources

Late Pennsylvanian vegetation changes in the Donets Basin: syndynamic aspect

open access: yesВісник Харківського національного університету імені В.Н. Каразіна. Серія Геологія. Географія. Екологія, 2022
The purpose of the article. The article is devoted to the study of one from forms of syndynamics in Late Pennsylvanian time, namely phytocoenogenesis. The study of the phytocoenogenesis of ancient plant communities, i.e., the formation of new types of ...
Nataliia Boyarina
doaj   +1 more source

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