Results 111 to 120 of about 16,764 (247)
The geology and geochronology of Al Wahbah maar crater, Harrat Kishb, Saudi Arabia [PDF]
Al Wahbah is a large (∼2.2 km diameter, ∼250 m deep) maar crater in the Harrat Kishb volcanic field in western Saudi Arabia. It cuts Proterozoic basement rocks and two Quaternary basanite lava flows, and is rimmed with an eroded tuff ring of debris from ...
Abdel Wahab, Antar +4 more
core +1 more source
Carbonate sedimentology: An evolved discipline
Abstract Although admired and examined since antiquity, carbonate sediment and rock research really began with Charles Darwin who, during a discovery phase, studied, documented and interpreted their nature in the mid‐19th century. The modern discipline, however, really began after World War II and evolved in two distinct phases.
Noel P. James, Peir K. Pufahl
wiley +1 more source
Macroscopic organisms are rare in the fossil record until the Ediacaran Period, beginning 635 million years ago. Here, Zhu et al. report the discovery of 1.56-billion-year-old carbonaceous compression fossils that provide evidence of the evolution of ...
Shixing Zhu +8 more
doaj +1 more source
Carbon release during continental rifting is thought to regulate atmospheric CO2 levels. Supercontinent dispersal‐induced extensional tectonics is similar during the Late Ediacaran and Jurassic, while they exhibit different increases in atmospheric CO2 ...
Xinxin Wang +5 more
doaj +1 more source
a new Pc-C boundary section [PDF]
The widespread, terminal Ediacaran Dengying Formation (~ 551–~ 542 Ma) of South China hosts one of the most prominent negative carbonate carbon isotope excursions in Earth's history and thus bears on the correlation of the Precambrian–Cambrian boundary ...
Gamper, A. +4 more
core +1 more source
Ediacaran and Cambrian stratigraphy in Estonia: an updated review [PDF]
Previous late Precambrian and Cambrian correlation charts of Estonia, summarizing the regional stratigraphic nomenclature of the 20th century, date back to 1997.
Tõnu Meidla
doaj +1 more source
The last common bilaterian ancestor [PDF]
Many regulatory genes appear to be utilized in at least superficially similar ways in the development of particular body parts in Drosophila and in chordates.
Davidson, Eric H., Erwin, Douglas H.
core
Controls on the evolution of Ediacaran metazoan ecosystems: A redox perspective [PDF]
A growing number of detailed geochemical studies of Ediacaran (635–541 Ma) marine successions have provided snapshots into the redox environments that played host to the earliest known metazoans.
Aceñolaza +254 more
core +3 more sources
Abstract Biomineralization around the Ediacaran–Cambrian boundary enabled new ecological strategies, including encrustation, boring and cavity‐dwelling, across various lineages. Here we describe problematic vesicular fossils that are attached to, or embedded within, the calcium phosphatic shells of the tommotiid genus Tesella from the middle Cambrian ...
Sebastian Willman, John S. Peel
wiley +1 more source
The laurentian record of neoproterozoic glaciation, tectonism, and eukaryotic evolution in Death Vally, California [PDF]
Neoproterozoic strata in Death Valley, California contain eukaryotic microfossils and glacial deposits that have been used to assess the severity of putative Snowball Earth events and the biological response to extreme environmental change.
A. E. Fallick +62 more
core +1 more source

