Results 161 to 170 of about 154,283 (378)

Aquitardifer: A New Hydrogeologic Term for Geologic Materials with both Aquitard and Aquifer Properties

open access: yesGroundwater, EarlyView.
Abstract We propose that a new term, aquitardifer, be added to the hydrogeologic nomenclature. Aquitardifer, a blend of the terms aquitard and aquifer, accounts for geologic materials that have properties of both as traditionally defined. Several examples of aquitardifers are provided, as is justification for and applicability of the term.
Anthony C. Runkel, Jessica R. Meyer
wiley   +1 more source

Petrogenesis and provenance of distal volcanic tuffs from the Permian–Triassic Karoo Basin, South Africa: A window into a dissected magmatic province

open access: yes, 2016
We present zircon rare earth element (REE) compositions integrated with U-Pb ages of zircon and whole-rock geochemistry from 29 volcanic tuffs preserved in the Karoo Supergroup, South Africa, to investigate the history of magmatism in southern Gondwana ...
M. McKay   +4 more
semanticscholar   +1 more source

Historical Biogeography of Spiny Lobsters in the Genus Panulirus (Achelata: Palinuridae)

open access: yesJournal of Biogeography, EarlyView.
ABSTRACT Aim Panulirus is the spiny lobster genus with the most living species, containing 22 recognised species split into two lineages distinguished by habitat preference. Diversification has been proposed to occur due to geographic events affecting the distribution of adults and the dispersal potential of long‐lived larvae by oceanic currents ...
Alyssa M. Baker   +2 more
wiley   +1 more source

High-resolution carbon and oxygen isotope records in the Chang 7 organic-rich shale of the Yanchang formation, Ordos Basin, China and their geological significance

open access: yesFrontiers in Earth Science
The Late Triassic Chang 7 Member lacustrine organic-rich shale in the Ordos Basin is the most significant source rock for the Mesozoic oil system in the basin.
Haowen Deng
doaj   +1 more source

Hydrological summary for the United Kingdom: February 2002 [PDF]

open access: yes, 2001
The monthly summary of hydrological conditions in the United Kingdom is compiled as part of the National Hydrological Monitoring Programme (a joint CEH and BGS enterprise).
Marsh, Terry, Sanderson, Felicity
core   +1 more source

The origin and evolution of air sacs in pterosaurs and their forerunners

open access: yesJournal of Anatomy, EarlyView.
Pneumatized pterosauromorph vertebrae and their phylogenetic context. Abstract Although the existence of postcranial pneumaticity and the inferred presence of air sacs connected to the lungs are well established in Pterosauria, the origin of this system in pterosaurs remains unclear. We investigated skeletal pneumaticity in the Triassic pterosauromorph
Tito Aureliano   +4 more
wiley   +1 more source

Gravity-flow dominated sedimentation on the Buda paleoslope (Hungary): Record of Late Eocene continental escape of the Bakony unit [PDF]

open access: yes, 1992
The Upper Eocene sequence of the Buda Hills consists of fluvial and shallow marine conglomerates, sandstones, bioclastic shallow-water limestone, marlstone and pelagic Globigerina marl.
Fodor, László   +3 more
core  

A suture in time: The ontogeny of cranial suture morphology in mammals

open access: yesJournal of Anatomy, EarlyView.
Mammal cranial sutures are important indicators of the biomechanical and developmental pressures acting upon the skull. Across three prominent sutures dividing the vault of the mammalian skull, divergent patterns emerge both taxonomically and developmentally.
Heather E. White   +4 more
wiley   +1 more source

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