scholarly journals Revision of the early Oligocene flora of Hrazený hill (formerly Pirskenberg) in Knížecí near Šluknov, North Bohemia

2015 ◽  
pp. 55-102 ◽  
Author(s):  
Zlatko Kvaček ◽  
Vasilis Teodoridis ◽  
Jana Zajícová
Keyword(s):  
Early Oligocene

EVIDENCE FOR A HEAVILY GLACIATED ANTARCTIC CONTINENT DURING THE EARLY OLIGOCENE RECOVERY (33-30 MA): ODP SITE 690

2016 ◽  
Author(s):  
Victor A. Pincay ◽  
◽  
Stephen F. Pekar
Keyword(s):  
Early Oligocene ◽  
Antarctic Continent

EARLY OLIGOCENE PARTIAL MELTING AND PROLONGED LOW P/T ANATEXIS OF THE UPPER HIGH HIMALAYA CRYSTALLINE SEQUENCES IN FAR-EASTERN NEPAL

2017 ◽  
Author(s):  
Takeshi Imayama ◽  
◽  
Toru Takeshita ◽  
Keewook Yi ◽  
Mayuko Fukuyama
Keyword(s):  
Partial Melting ◽  
Early Oligocene ◽  
Far Eastern

AGES OF CENOZOIC STRATA DEPOSITED IN THE TUOTUOHE BASIN AND IMPLICATIONS FOR THE EARLY OLIGOCENE PALEOELEVATION OF THE NORTHERN TIBETAN PLATEAU

2018 ◽  
Author(s):  
Leyi Li ◽  
◽  
Hong Chang ◽  
Hong Chang ◽  
Nathan A. Niemi ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Early Oligocene ◽  
Northern Tibetan Plateau

scholarly journals The Cenozoic Malaguide Basin from Sierra Espuña (Murcia, S Spain): An Example of Geological Heritage

Geosciences ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 34
Author(s):  
Santiago Moliner-Aznar ◽  
Manuel Martín-Martín ◽  
Tomás Rodríguez-Estrella ◽  
Gregorio Romero-Sánchez
Keyword(s):  
Middle Eocene ◽  
Geological Heritage ◽  
Passive Margin ◽  
Early Miocene ◽  
Late Oligocene ◽  
Deep Basin ◽  
Sedimentary Evolution ◽  
Early Oligocene ◽  
Upper Oligocene ◽  
Very High

The Cenozoic Malaguide Basin from Sierra Espuña (Internal Betic Zone, S Spain) due to the quality of outcropping, areal representation, and continuity in the sedimentation can be considered a key-basin. In the last 30 years, a large number of studies with very different methodological approaches have been done in the area. Models indicate an evolution from passive margin to wedge-top basin from Late Cretaceous to Early Miocene. Sedimentation changes from limestone platforms with scarce terrigenous inputs, during the Paleocene to Early Oligocene, to the deep basin with huge supplies of turbidite sandstones and conglomerates during the Late Oligocene to Early Miocene. The area now appears structured as an antiformal stack with evidence of synsedimentary tectonics. The Cenozoic tectono-sedimentary basin evolution is related to three phases: (1) flexural tectonics during most of the Paleogene times to create the basin; (2) fault and fold compartmentation of the basin with the creation of structural highs and subsiding areas related to blind-fault-propagation folds, deforming the basin from south to north during Late Oligocene to Early Aquitanian times; (3) thin-skin thrusting tectonics when the basin began to be eroded during the Late Aquitanian-Burdigalian. In recent times some works on the geological heritage of the area have been performed trying to diffuse different geological aspects of the sector to the general public. A review of the studies performed and the revisiting of the area allow proposing different key-outcrops to follow the tectono-sedimentary evolution of the Cenozoic basin from this area. Eight sites of geological interest have been selected (Cretaceous-Cenozoic boundary, Paleocene Mula Fm, Lower Eocene Espuña-Valdelaparra Fms, Middle Eocene Malvariche-Cánovas Fms, Lowermost Oligocene As Fm, Upper Oligocene-Lower Aquitanian Bosque Fm, Upper Oligocene-Aquitanian Río Pliego Fm, Burdigalian El Niño Fm) and an evaluation has been performed to obtain four parameters: the scientific value, the educational and touristic potential, and the degradation risk. The firsts three parameters obtained values above 50 being considered of “high” or “very high” interest (“very high” in most of the cases). The last parameter shows always values below 50 indicating a “moderate” or “low” risk of degradation. The obtained values allow us considering the tectono-sedimentary evolution of this basin worthy of being proposed as a geological heritage.

Reconstruction of the latest Eocene-early Oligocene paleoenvironment in the Hoh Xil Basin (Central Tibet) based on palynological and ostracod records

2021 ◽  
Vol 217 ◽  
pp. 104860
Author(s):  
Bowen Song ◽  
Kexin Zhang ◽  
Fang Han ◽  
Zhiyuan Liu ◽  
Keke Ai ◽  
...  
Keyword(s):  
Early Oligocene ◽  
Central Tibet ◽  
Latest Eocene

scholarly journals Late oligocene–early miocene shortening in the Thrace Basin, northern Aegean

2021 ◽  
Author(s):  
Ümitcan Erbil ◽  
Aral I. Okay ◽  
Aynur Hakyemez
Keyword(s):  
Large Scale ◽  
Middle Eocene ◽  
Early Miocene ◽  
Fold Axis ◽  
Late Oligocene ◽  
The Balkans ◽  
Sedimentary Sequences ◽  
The North ◽  
Early Oligocene ◽  
Thrace Basin

AbstractLate Cenozoic was a period of large-scale extension in the Aegean. The extension is mainly recorded in the metamorphic core complexes with little data from the sedimentary sequences. The exception is the Thrace Basin in the northern Aegean, which has a continuous record of Middle Eocene to Oligocene marine sedimentation. In the Thrace Basin, the Late Oligocene–Early Miocene was characterized by north-northwest (N25°W) shortening leading to the termination of sedimentation and formation of large-scale folds. We studied the stratigraphy and structure of one of these folds, the Korudağ anticline. The Korudağ anticline has formed in the uppermost Eocene–Lower Oligocene siliciclastic turbidites with Early Oligocene (31.6 Ma zircon U–Pb age) acidic tuff beds. The turbidites are underlain by a thin sequence of Upper Eocene pelagic limestone. The Korudağ anticline is an east-northeast (N65°E) trending fault-propagation fold, 9 km wide and 22 km long and with a subhorizontal fold axis. It is asymmetric with shallowly-dipping northern and steeply-dipping southern limbs. Its geometry indicates about 1 km of shortening in a N25°W direction. The folded strata are unconformably overlain by Middle Miocene continental sandstones, which constrain the age of folding. The Korudağ anticline and other large folds in the Thrace Basin predate the inception of the North Anatolian Fault (NAF) by at least 12 myr. The Late Oligocene–Early Miocene (28–17 Ma) shortening in the Thrace Basin and elsewhere in the Balkans forms an interlude between two extensional periods, and is probably linked to changes in the subduction dynamics along the Hellenic trench.

Earliest Arikareean (later early Oligocene) Iniyoo local Fauna from Chilapa formation of Santiago Yolomécatl area in northwestern Oaxaca, southern Mexico

2021 ◽  
pp. 103307
Author(s):  
Eduardo Jiménez-Hidalgo ◽  
E. Bruce Lander ◽  
Isabel Israde-Alcántara ◽  
Nadia Wendoline Rodríguez-Caballero ◽  
Rosalía Guerrero-Arenas
Keyword(s):  
Local Fauna ◽  
Southern Mexico ◽  
Early Oligocene

Deviacer pidemarmanii sp. nov. (Polygalaceae) from the Late Eocene–Early Oligocene Badger’s Nose Paleoflora, Modoc County, California

2015 ◽  
Vol 176 (3) ◽  
pp. 259-268 ◽  
Author(s):  
Jeffrey A. Myers ◽  
Diane M. Erwin
Keyword(s):  
Late Eocene ◽  
Early Oligocene

Falcatifolium (Podocarpaceae) macrofossils from paleogene sediments in south-eastern Australia: a reassessment

1998 ◽  
Vol 11 (6) ◽  
pp. 711 ◽  
Author(s):  
Robert S. Hill ◽  
Leonie J. Scriven
Keyword(s):  
Leaf Morphology ◽  
Middle Eocene ◽  
Late Eocene ◽  
South Eastern ◽  
Early Oligocene ◽  
Extant Species ◽  
Eastern Australia ◽  
South Eastern Australia

A re-investigation of macrofossils previously referred to the extantpodocarpaceous genus Falcatifolium Laubenfels shows thatno records can be sustained. Falcatifolium australisD.R.Greenwood from Middle Eocene sediments in Victoria bears littleresemblance to extant species in the genus and is transferred to the newfossil genus Sigmaphyllum R.S.Hill & L.J.Scriven.Specimens from Early Oligocene sediments in Tasmania previously assigned toFalcatifolium are described as a second species ofSigmaphyllum, S. tasmanensisR.S.Hill & L.J.Scriven, and specimens from mid to late Eocene sediments inTasmania previously assigned to Falcatifolium do notbelong to that genus, although their true generic affinities are uncertain.Dispersed cuticle specimens from Late Eocene–Oligocene sediments inSouth Australia referred to Falcatifolium are notreliable records of the genus and require further investigation. However,Dacrycarpus eocenica D.R.Greenwood, from Middle Eocenesediments in Victoria is transferred to Falcatifolium,and is similar to the extant species F. angustumLaubenfels, which has a leaf morphology unusual for the genus.Falcatifolium eocenica (D.R.Greenwood) R.S.Hill & L.J.Scriven is the only reliable record of the genus in the Australian fossilrecord to date.

Sign in / Sign up

Export Citation Format

Share Document