Results 81 to 90 of about 8,049 (227)

A palaeomagnetic study of Syrian volcanic rocks of Miocene to Holocene age [PDF]

Geofísica Internacional, 1999
Miocene and younger volcanic rocks from Syria show both normal and reversed polarities after thermal demagnetisation. Similarities in site mean directions may be used to establish lavas erupted at similar times.
A. L. Abdeldayem, D. H. Tarling, J. M. Abou-Deeb, M. M. Otaki   +3 more
doaj  

Are regional stages necessary? [PDF]

, 2005
The bipartition of the Carboniferous System adopted by the International Commission of Stratigraphy for the world stratigraphic chart is impractical in Gondwana.
Gonzalez, Carlos Roberto
core  

The Global Stratotype Sections and Points for the bases of the Selandian (Middle Paleocene) and Thanetian (Upper Paleocene) stages at Zumaia, Spain [PDF]

, 2011
The global stratotype sections and points for the bases of the Selandian (Middle Paleocene) and Thanetian (Upper Paleocene) stages have been defined in the coastal cliff along the Itzurun Beach at the town of Zumaia in the Basque Country, northern Spain.
Alegret, Laia, Apellaniz, Estibaliz, Arenillas, Ignacio, Aubry, Marie-Pierre, Baceta, Juan-Ignacio, Berggren, William A., Bernaola, Gilen, Caballero, Fernando, Clemmensen, Anne, Dinares-Turell, Jaume, Dupuis, Christian, Heilmann-Clausen, Claus, Hilario Orus, Asier, Knox, Robert, Martin-Rubio, Maite, Molina, Eustoquio, Monechi, Simonetta, Ortiz, Silvia, Orue-Etxebarria, Xabier, Payros, Aitor, Petrizzo, Maria Rose, Pujalte, Victoriano, Schmitz, Birger, Speijer, Robert P., Sprong, Jorinde, Steurbaut, Etienne, Thomsen, Erik, von Salis, Katharina   +27 more
core   +1 more source

New Zealand Geological Timescale 2025

New Zealand Journal of Geology and Geophysics, Volume 69, Issue 1, March 2026.
New Zealand Geological Timescale 2025 (NZGT 2025) is the first comprehensive update and revision of the New Zealand Geological Timescale in a decade. The criteria used to establish age ranges of New Zealand Stages within the NZGT have been reviewed, calibrated, and revised where required against the 2023/04 International Chronostratigraphic Chart and ...
Christopher D. Clowes, James S. Crampton, Kyle J. Bland, J. Ian Raine, Andrew F. Boyes, Hamish J. Campbell, Erica M. Crouch, Martin P. Crundwell, Neville Hudson, Elizabeth M. Kennedy, Donald A. B. MacFarlan, Hugh E. G. Morgans, Marcus D. Richards, Matthew W. Sagar   +13 more
wiley   +1 more source

A Hyperactive Geomagnetic Field in the Late Visean (Early Carboniferous) From the Late Asbian Stratotype Section in Northwest England, UK

Geochemistry, Geophysics, Geosystems
The pattern of geomagnetic polarity changes during the Early Carboniferous (Mississippian) is not known in detail. This information sparsity is addressed by determining a magnetostratigraphy from the late Asbian (late Visean at ∼333 Ma) in Trowbarrow ...
Mark W. Hounslow, Andrew J. Biggin, Pedro Cózar, Ian D. Somerville, Tereza Kamenikova, Courtney J. Sprain   +5 more
doaj   +1 more source

Orbitally tuned timescale and astronomical forcing in the middle Eocene to early Oligocene [PDF]

, 2014
Deciphering the driving mechanisms of Earth system processes, including the climate dynamics expressed as paleoceanographic events, requires a complete, continuous, and high-resolution stratigraphy that is very accurately dated.
G. Acton, H. Pälike, P. A. Wilson, R. Wilkens, T. Westerhold, U. Röhl   +5 more
core   +1 more source

Magnetic‐A: The New R‐Based Toolbox for Analysis of Paleomagnetic Data

Earth and Space Science, Volume 13, Issue 3, March 2026.
Abstract Paleomagnetic remanence in rocks and sediments provides a unique means to constrain stratigraphic records in both space and time. This is because of the symmetry of the paleomagnetic field with respect to Earth's spin axis over geological time, and the global synchronicity of magnetic field reversals.
E. Dallanave
wiley   +1 more source

Integrated stratigraphy of the Upper Barremian–Aptian sediments from the south-eastern Crimea

Geologica Carpathica, 2018
Previous studies made in different parts of the world have shown that Barremian–Aptian times imply many difficulties in deciphering the biostratigraphy, microfossil evolution and correlation of bioevents.
Karpuk Maria S., Shcherbinina Ekaterina A., Brovina Ekaterina A., Aleksandrova Galina N., Guzhikov Andrey Yu., Shchepetova Elena V., Tesakova Ekaterina M.   +6 more
doaj   +1 more source

Miocene to Early Pleistocene Depositional History and Tectonic Evolution of the Issyk‐Kul Basin, Central Tian Shan

Geochemistry, Geophysics, Geosystems, 2021
The Issyk‐Kul Basin (Kyrgyzstan), situated in the central Tian Shan Mountains, hosts the largest and deepest mountain lake in Central Asia. Erosion of the surrounding Terskey and Kungey ranges led to the accumulation of up to 4 km of sediment in the ...
Sophie C. Roud, Michael R. Wack, Stuart A. Gilder, Anna Kudriavtseva, Edward R. Sobel   +4 more
doaj   +1 more source

The identification and biogeochemical interpretation of fossil magnetotactic bacteria [PDF]

, 2008
Magnetotactic bacteria, which most commonly live within the oxic-anoxic transition zone (OATZ) of aquatic environments, produce intracellular crystals of magnetic minerals, specifically magnetite or greigite.
Kirschvink, Joseph L., Kopp, Robert E.
core   +1 more source