Results 181 to 190 of about 7,983 (211)

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
openaire   +1 more source

KIRKHEAD CAVE: BIOSTRATIGRAPHY AND MAGNETOSTRATIGRAPHY

Archaeometry, 1984
Existing hypotheses concerning the speed and timing of the recolonisation of Britain by man after the last glaciation have largely been developed in the absence of securely‐dated Later Upper Palaeolithic (LUP) sites in the marginal areas of colonisation.
S. J. GALE, C. O. HUNT, G. A. SOUTHGATE
openaire   +1 more source

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
openaire   +1 more source

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.
openaire   +1 more source

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
openaire   +1 more source

Magnetostratigraphy of Sediments in Mammoth Cave, Kentucky

Science, 1982
Clastic sediment deposits found within the caves of Mammoth Cave National Park have yielded a magnetostratigraphic pattern of magnetic polarity reversals which indicates-that they were deposited over a range of at least 1 million and most likely 2 million years.
openaire   +2 more sources

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.
openaire   +1 more source

Dating, Magnetostratigraphy

2009
Krijgsman, Wout, Langereis, C. G.
openaire   +1 more source

The Interrelationship between Magnetostratigraphy and Tephrochronology

1981
Magnetostratigraphy and tephrochronology represent complementary techniques for the determination of the ages of sedimentary sequences. Each method is subject to its own limitations. The magnetic polarity zonation of a sequence may not be sufficiently characteristic to correlate it to the magnetic polarity time scale.
openaire   +1 more source

Magnetostratigraphy

Physics of the Earth and Planetary Interiors, 1990
openaire   +1 more source