Results 171 to 180 of about 4,235 (222)

Magnetostratigraphy

Geology Today, 1987
Magnetostratigraphy involves the study of changes in the Earth's magnetic field that are recorded in sediments and rocks. These include short‐term fluctuations (secular variation), polarity transitions and magnetic reversal sequences. All have important applications in the Earth sciences.
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Magnetostratigraphy concepts, definitions, and applications

Newsletters on Stratigraphy, 2010
The most characteristic feature of the Earth's magnetic field is that it reverses polarity at irregu- lar intervals, producing a 'bar code' of alternating normal (north directed) and reverse (south directed) polar- ity chrons with characteristic durations.
C. G. Langereis, W. Krijgsman, G. Muttoni, M. Menning   +3 more
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Magnetostratigraphy of Vindhyan Supergroup

Journal Geological Society of India, 1996
Abstract In the absence of conventional radiometric dating and fossil evidence, magnetostratigraphy is considered to be a very powerful tool to correlate rock formations. Often the magnetozones are used as bench marks in correlation of rocks as the geomagnetic field reversals are ubiquitously synchronous.
G. V. S. Poornachandra Rao, M. S. Bhalla
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Quaternary magnetostratigraphy in Denmark

Boreas, 1987
Magnetostratigraphical results from various historical, Holocene, Lateglacial and Glacial deposits from Central Jutland, Vendsyssel, the Baltic Sea and Schleswig‐Holstein are illustrated and discussed. Although only a few archaeomagnetic case studies have yet been made in Denmark, magnetic datings with accuracies of about ±50 years have been obtained ...
NIELS ABRAHAMSEN, PETER W. READMAN
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Magnetostratigraphy

Magnetostratigraphy is a stratigraphic technique that utilizes the magnetic properties of rocks to establish chronological frameworks and correlate stratigraphic sections across geological time. It is based on the premise that rocks retain a record of the Earth’s magnetic field at the time of their formatio-n.
Palcu Rolier, Dan V., Krijgsman, Wout
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Mammals and Magnetostratigraphy

Journal of Geological Education, 1988
Magnetic polarity stratigraphy has become one of the most important tools for correlation of fossiliferous terrestrial deposits. Since 1975, many of the suitable fossiliferous terrestrial vertebrate-bearing sequences in North America, Eurasia, South America, and Africa, have been correlated with the magnetic polarity timescale.
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Global holocene magnetostratigraphy

Hydrobiologia, 1983
Paleolimnomagnetic records from five regions of the world have been combined with historical magnetic field observations in order to produce regional geomagnetic master curves.
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Magnetostratigraphy of the Jurassic/Cretaceous boundary

Geology, 1986
There is no internationally recognized standard for the Jurassic/Cretaceous boundary; a precise biostratigraphical correlation between different paleobiogeographic provinces is impossible due to barriers blocking faunal exchange. This problem may be overcome by using magnetic polarity events, which are globally isochronous.
James G. Ogg, William Lowrie
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Secular variation magnetostratigraphy

1986
This chapter concentrates on secular variation magnetostratigraphic dating applications within the past 10 000 years. It describes collection and measurement techniques which have been found useful in investigating lake sediments and presents type palaeomagnetic secular variation records of both declination and inclination, from seven regions of the ...
Roy Thompson, Frank Oldfield
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Magnetostratigraphy of Jurassic Rocks

2015
Magnetic polarity scales younger than 160 Ma are derived from seafloor magnetic anomalies. For older times, such scales must be derived from polarity successions obtained in the continents yielding a precise age control such as that provided by ammonites, i.e., 1 myr.
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