Results 121 to 130 of about 470 (166)

Age constraint for an earliest Famennian forest and its implications for Frasnian-Famennian boundary in West Junggar, Northwest China

Palaeogeography, Palaeoclimatology, Palaeoecology, 2020
Abstract As one of the five major extinction events in Earth history, the Frasnian-Famennian boundary (FFB) crisis caused dramatic reductions in marine and terrestrial diversity. The effects of this event on terrestrial ecosystems are not well understood due to the limited preservation of terrestrial sedimentary rocks and the relative scarcity of ...
Daran Zheng, Su-Chin Chang, Thomas Algeo, Haichun Zhang, Bo Wang, He Wang, Jun Wang, Chongqin Feng, Honghe Xu   +8 more
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Archaeopteris from the Upper Famennian of Belgium: heterospory, nomenclature, and palaeobiogeography [PDF]

Review of Palaeobotany and Palynology, 2001
New fertile specimens of Archaeopteris roemeriana from Upper (but not uppermost) Famennian strata of Belgium have been studied. Crowded sporangia are borne on non-laminate, three times bifurcate fertile leaves helically arranged around the fertile ultimate axes. Vegetative leaves occur both proximal and distal to the fertile leaves.
Maurice Streel, M Streel
exaly   +4 more sources

FAMENNIAN TENTACULITIDS OF CHINA

Journal of Paleontology, 2000
Until recently, paleontologists believed tentaculitids became extinct by the end of the Frasnian. Lyaschenko (1958) described the youngest occurrence of the genera Styliolina and Homoctenus from the Frasnian of Russia. However, in Europe and North Africa, Lardeux (1969) proposed that Homoctenus ultimus pergracilis persisted into the Famennian ...
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Famennian chondrichthyan microremains from Morocco and Sardinia

Journal of Paleontology, 2008
New material from the Famennian of Morocco in the southern Maider comprises chondrichthyan teeth(Thrinacodus, Cobelodus, Denaea, Stethacanthus), actinopterygian remains (scales, teeth and hemilepidotrichium) and one acanthodian scale. The absence of crushing teeth suggests deeper water environments for the Maider Basin than the Tafilalt Basin ...
Derycke Khatir C., SPALLETTA, CLAUDIA, PERRI, MARIA CRISTINA, Corradini C.   +3 more
openaire   +2 more sources

Famennian Reefs in Alberta, Canada: ABSTRACT

AAPG Bulletin, 1964
The lowermost 200 feet of the Wabamun group of Famennian age may sporadically display an unusually abundant fauna in the subsurface of Alberta northeast of the then slowly submerging Poaco River landmass. This fauna, composed of stromatoporoids, coralline algae and various rod- and tube-shape bioclastic fragments in a sparry cement, is completely ...
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Frasnian-Famennian extinctions

1982
Extinctions are continuous throughout the Phanerozoic. Although a single natural phenomenon brought about by environmental change at any scale, they may be conveniently divided into two classes: background extinction and mass extinction (Raup and Sepkoski, 1982).
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A Possible Bacterial Origin for Famennian Micrites

1977
Since Drew (1911), the role of bacterias for preCipitation of calciwn carbonates (marine) has been recognized. Their biochemical effects on orgaDic sludge have been tentatively demonstrated by Trichet (1967–1972) and other workers. It should be stressed that blue-green algae playa passive role, as providers of organic substrate.
A. F. Maurin, D. Noël
openaire   +1 more source

Famennian crinoids and blastoids (Echinodermata) from Mongolia

Palaeobiodiversity and Palaeoenvironments, 2020
Herein we report on the most abundant and diverse fauna of Palaeozoic crinoids and blastoids collected from Mongolia to date. The fauna is from the Late Devonian (Famennian) Samnuuruul Formation in western Mongolia. The fauna consists of two genera of blastoids and twelve genera of crinoids—four genera of camerates, three genera of flexibles, one ...
J. A. Waters, J. W. Waters, P. Königshof, S. K. Carmichael, M. Ariuntogos   +4 more
openaire   +1 more source

The global Frasnian-Famennian »Kellwasser Event«

Geologische Rundschau, 1991
During the UppermostP. gigas conodont zone (P. linguiformis zone) the stepwise Frasnian extinction culminates in the global transgressive-regressive Frasnian-Famennian »Kellwasser event«. Most pelagic organisms of the tropical marine environment are more or less affected by this mass extinction.
openaire   +1 more source

Influence of the Frasnian-Famennian event on radiolarian faunas

Eclogae Geologicae Helvetiae, 2006
The impact of the Frasnian-Famennian biotic mass extinction event (F-F event) on radiolarian faunas is examined in 13 sections, which belong to two types of cherty basin in South China. No appreciable decrease in radiolarian biodiversity is observed across the F-F boundary. Indeed, radiolarian faunas flourished during the Famennian.
Wang, Yu-Jing, Luo, Hui, Aitchison, Jonathan C.   +2 more
openaire   +6 more sources