Results 31 to 40 of about 41,624 (295)

Toroidal-poloidal partitioning of plate motions since 120 MA [PDF]

open access: yes, 1993
Changes in plate motions and plate configurations during the Cenozoic and Mesozoic have been investigated extensively, but most geodynamical models have concentrated on present-day plate motions.
Richards, M.A.   +9 more
core   +1 more source

New Early Cretaceous pentatomorph bugs from China and the systematic position of Kobdocoridae [PDF]

open access: yesActa Palaeontologica Polonica
Kobdocoridae is an extinct family of the infraorder Pentatomomorpha, mainly distributed in the Eurasia and currently comprise only nine species from seven genera in three locations.
RUI DAI   +4 more
doaj   +1 more source

Fission track ages and Mesozoic tectonic uplift in the Niushoushan-Luoshan area on the western edge of the Ordos Basin

open access: yesDizhi lixue xuebao, 2023
The western margin of the Ordos Basin and its adjacent regions have undergone a complex tectonic evolution from the Mesozoic to the Cenozoic era. However, the question of tectonic uplift since the Cenozoic era remains a topic of contention, and the ...
TIAN Zhaoyang   +5 more
doaj   +1 more source

First record of chimaeroid fish Ischyodus from the Upper Jurassic of southwestern Gondwana [PDF]

open access: yesActa Palaeontologica Polonica, 2021
This study presents two specimens of Chimaeriformes from Upper Jurassic strata of central Chile. The material was recovered from Tithonian levels of the Baños del Flaco Formation and includes two different individuals, one preserving two articulated ...
Rodrigo A. Otero   +5 more
doaj   +1 more source

Provenance and geochemistry of exotic clasts in conglomerates of the Oligocene Torehina Formation, Coromandel Peninsula, New Zealand [PDF]

open access: yes, 2003
Non-marine pebble to cobble conglomerates of the lower Torehina Formation (Oligocene) crop out along western Coromandel Peninsula and overlie, with strong angular discordance, continental-margin metasedimentary rocks (Manaia Hill Group) of Mesozoic (Late
Nelson, Campbell S.   +3 more
core   +1 more source

Guaraní Aquifer System sedimentary petrography of outcropping formations and hydrogeologic implications

open access: yesAgrociencia Uruguay, 2022
Petrographic analyses are presented for the Rivera, Tacuarembó and Cuchilla Ombú formations, which constitute the outcropping Guaraní Aquifer System in the Rivera and Tacuarembó departments, Uruguay.
Paula Collazo   +2 more
doaj   +1 more source

Integrated phylogenomic and fossil evidence of stick and leaf insects (Phasmatodea) reveal a Permian–Triassic co-origination with insectivores [PDF]

open access: yesRoyal Society Open Science, 2020
Stick and leaf insects (Phasmatodea) are a distinctive insect order whose members are characterized by mimicking various plant tissues such as twigs, foliage and bark.
Erik Tihelka   +4 more
doaj   +1 more source

Relationship between carina size and sternum morphology in birds reflects physical constraints of body size and flight style. [PDF]

open access: yesJ Anat
Sternum morphology varies among birds and is a function of body mass and order. The area of the sternum is inversely related to the area of the keel suggesting that the increase in bone mass associated with a large keel has been mitigated by a reduction in bone mass of the sternum.
Deeming DC.
europepmc   +2 more sources

The Bryophytes of the Palaeozoic and the Mesozoic.

open access: yesAnnals of the Missouri Botanical Garden, 1990
(Uploaded by Plazi from the Biodiversity Heritage Library) No abstract provided.
Janssens, Jan A, Oostendorp, Cora
openaire   +2 more sources

Formation and evolution of Yin'gen-E'ji'naqi Basin and prospects for oil and gas exploration

open access: yesShiyou shiyan dizhi, 2020
The Yin'gen-E'ji'naqi Basin is located in the central and western part of the Inner Mongolia autonomous region, with an area of about 123×103 km2. It is a continental rift basin with a low exploration degree in North China.
Hong'an ZHANG   +7 more
doaj   +1 more source

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