Results 161 to 170 of about 1,022 (197)

Tremadocian (Early Ordovician) chitinozoan biostratigraphy of South China: An update

Review of Palaeobotany and Palynology, 2017
Abstract The lowest Ordovician (Tremadocian) chitinozoan biostratigraphy of the South China Palaeoplate has been reviewed and updated, based on new investigation from the Upper Yangtze area. The systematic paleontology of Lagenochitina pestovoensis Obut 1973 and Lagenochitina destombesi Elaouad-Debbaj 1988, has been revised.
Jianbo Liu, Thomas Servais
exaly   +3 more sources

The Brattefors plugs: Collapse structures initiated during a Tremadocian regression

Gff, 1988
Abstract At Brattefors on the southern slope of Kinnekulle, Vastergotland, Sweden, Upper Cambrian bituminous shale is cut by plugs consisting of a thick, relatively undisturbed succession of Tremadocian Ceratopyge Shale otherwise not represented in the vicinity. Drillcores show the plugs to reach down into Lower Cambrian sandstone.
Maurits Lindström
exaly   +2 more sources

Tremadocian (Early Ordovician) graptolite biostratigraphy of China

Newsletters on Stratigraphy, 2004
Based on a study of latest Tremadocian graptolites from Gulin of southern Sichuan and a re-examination of Tremadocian graptolite specimens previously collected from many other localities in South China, a new scheme of Tremadocian graptolite biozonation is proposed for the South China palaeoplate, to include seven zones.
Yuandong Zhang, Bernd-D. Erdtmann, Hongzhen Feng   +2 more
openaire   +1 more source

Tremadocian (Ordovician) graptolite diversification events in China

Alcheringa: An Australasian Journal of Palaeontology, 2001
Study of the taxonomy, evolution and distribution of Tremadoc graptolites and their sequences in China and other representative sections around the world indicates that five graptolite diversity events can be recognised during the Tremadoc interval. The taxonomic validity of the suborder Graptodendroidina is advocated.
Wang Xiaofeng, Wang Chuanshang
openaire   +1 more source

Tremadocian acritarchs from northwestern Argentina

Review of Palaeobotany and Palynology, 1997
Abstract A Tremadocian acritarch assemblage is described from the Santa Rosita Formation, Cordillera Oriental, Salta Province, northwestern Argentina. The microplankton corresponds to trilobite-bearing strata assigned to the lower to upper Tremadocian from the middle part of the Santa Rosita Formation.
openaire   +1 more source

An Early Ordovician (late Tremadocian) bivalve fauna from Iran

Geological Journal, 2019
A small bivalve fauna is described from the late Tremadocian of Iran, adding to the very few localities in the world where bivalves of this age are known. In addition to indeterminate praenuculids, the fauna includes the praenuculid Pensarnia and the pteriomorphian genus Glyptarca.
John C.W. Cope, Mansoureh Ghobadi Pour
openaire   +1 more source

Depositional framework of the East Baltic Tremadocian black shale revisited

GFF, 2014
This article presents a centimetre- to micrometre-scale study of sedimentary fabrics from Lower Ordovician metalliferous black shale from the Baltic palaeobasin. Two sections of the Turisalu Fm. NW and NE Estonia were analysed with light microscopy and scanning electron microscopy. This rock unit is characterised by mostly thin bedding ( 
Rutt Hints, Sigrid Hade, Alvar Soesoo, Margus Voolma   +3 more
openaire   +1 more source

Late Tremadocian chitinozoans and acritarchs from northwestern Argentina (Western Gondwana)

Review of Palaeobotany and Palynology, 2009
Abstract Chitinozoans and acritarchs are recorded from the Saladillo and Parcha formations of the Pascha-Incamayo area (Salta Province), Cordillera Oriental, northwestern Argentina. These organic microfossils coexist with graptolites of the Kiaerograptus , Araneograptus murrayi and Hunnegraptus copiosus biozones of early late Tremadocian and ...
Claudia V Rubinstein, G Susana de la Puente   +1 more
exaly   +2 more sources

AN ASSEMBLAGE OF MICROPLANKTON FROM THE SHINETON SHALES (TREMADOCIAN)

Proceedings of the Yorkshire Geological Society, 1958
Summary A prolific assemblage of microplankton from the Shineton Shales (Tremadocian) is described. It consists almost entirely of hystrichospheres, including several new species of Hystrichosphaeridium, Micrhystridium, Veryhachium, Leiosphaeridia and Diornatosphaera gen. nov.
openaire   +1 more source

Dictyonema from the Tremadocian of Estonia and Norway

Geological Magazine, 1966
AbstractThe Dictyonema species currently named flabelliforme (Eichwald) (as distinct from D. norvegicum Kjerulf) from the Tremadocian of Estonia is described and compared with the lectotype of Kjerulf's D. graptolithinum from Norway, and their synonymy is confirmed.
openaire   +1 more source