Record of the younger part of the Pringle Falls excursion at Long Valley, California

Details Record of the younger part of the Pringle Falls excursion at Long Valley, California Record of the younger part of the Pringle Falls excursion at Long Valley, California

Nov 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998geoji.135..663l&link_type=abstract

Geophysical Journal International, Volume 135, Issue 2, pp. 663-670.

Astronomy and Astrophysics

Astronomy

2

Brunhes Normal Chron, California, Excursion, Oregon, Palaeomagnetism

Scientific paper

The younger of two closely spaced palaeomagnetic excursions at Pringle Falls, Oregon, is recorded in lacustrine silts that crop out in Long Valley, California. Assigned an age of about 220000 years, the virtual geomagnetic poles of the younger excursion form a clockwise loop that reached 35°S latitude east of South America before returning to the northern hemisphere in the Pacific Ocean west of Central America. The poles then form a narrow band across North America while moving to high northern latitudes. This record matches extremely well feature B of the original excursion record from Pringle Falls reported by Herrero-Bervera et al. (1994) and is similar to this excursion at Summer Lake, Oregon ( Negrini et al. 1994), in that the pole path is confined primarily to the east-central Pacific Ocean. On the basis of an assumed sedimentation rate of 30 cm per thousand years, the younger excursion (feature B at Pringle Falls) spans an estimated 1200 years and followed by about 1000 years a larger excursion (feature A at Pringle Falls) previously discovered at the same Long Valley site. At a second Long Valley site 30 m away, the younger excursion (feature B) is only partially recorded because of a presumed small hiatus in the sedimentary section.

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