Results 101 to 110 of about 11,694 (205)

Plio-Pleistocene changes in water mass exchange and erosional inputs in the Fram Strait [PDF]

open access: yes, 2011
We determined the isotopic composition of neodymium (Nd) and lead (Pb) of past seawater to reconstruct water mass exchange and erosional input between the Arctic Ocean and the Norwegian-Greenland Seas over the past 5 Ma.
Christl, Marcus   +4 more
core  

Late Holocene Abrupt Changes in the Fluvial Dynamics of the Tiber Valley Catchment (Rome, Italy): An Impact of the 4.2 Event?

open access: yesQuaternary
In the present work, we investigate the post-glacial aggradation of three tributary valleys draining the left hydrographic basin of the Tiber River in central Rome: the Murcia, Caffarella, and Grottaperfetta valleys.
Fabrizio Marra   +2 more
doaj   +1 more source

Integrated chronostratigraphy of Proterozoic-Cambrian boundary beds in the western Anabar region, northern Siberia [PDF]

open access: yes, 1996
Carbonate-rich sedimentary rocks of the western Anabar region, northern Siberia, preserve an exceptional record of evolutionary and biogeochemical events near the Proterozoic/Cambrian boundary. Sedimentologically, the boundary succession can be divided
Adams, William   +5 more
core  

Conodonts in Ordovician Chronostratigraphy

open access: yes, 2015
The great importance of conodonts in Ordovician chronostratigraphy is shown by the fact that conodonts are used for the definition of two of the seven global stages, and seven of the 18 stage slices, now recognized within this system.
Bergström, Stig M., FERRETTI, Annalisa
openaire   +1 more source

Planktonic foraminiferal biostratigraphy of the Miocene Arakawa Group in central Japan

open access: yesRevista Mexicana de Ciencias Geológicas, 2018
We examined a planktonic foraminiferal biostratigraphy in the middle to upper Miocene Arakawa Group in central Japan. Chronostratigraphy has been already established for this sequence based on K-Ar ages of intercalated volcaniclastic layers. The studied
Hiroki Hayashi, Masaki Takahashi
doaj  

Proposals to improve the Correlation chronostratigraphy scheme of early precambrian of Ukrainian shield

open access: yesМінеральні ресурси України, 2016
The article deals with the major disadvantages of different authors offers on improving existing “Correlation Chronostratigraphy scheme of Early Precambrian of Ukrainian Shield”.
M. M. Kostenko
doaj  

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