Paleomagnetism of the Late Ordovician Juniata Formation and the Remagnetization Hypothesis
Article first published online: 20 SEP 2012
Copyright 1977 by the American Geophysical Union.
Journal of Geophysical Research
Solid Earth and Planets
Volume 82, Issue 36, pages 5796–5802, 10 December 1977
How to Cite
1977), Paleomagnetism of the Late Ordovician Juniata Formation and the Remagnetization Hypothesis, J. Geophys. Res., 82(36), 5796–5802, doi:10.1029/JB082i036p05796., and (
- Issue published online: 20 SEP 2012
- Article first published online: 20 SEP 2012
- Manuscript Accepted: 6 JUN 1977
- Manuscript Received: 1 FEB 1977
The paleomagnetism of 103 samples from purplish gray sandstones of the Juniata Formation has been investigated. The samples were collected at 17 sites in Virginia, West Virginia, and Pennsylvania. Thermal demagnetization showed a strong magnetic overprinting in a large number of samples. This magnetization is secondary, since it was acquired during or after the late Paleozoic folding of the area; the resulting pole position, at 47°N, 129°E, agrees with published Late Carboniferous to Early Permian pole positions for North America. In all but 12 samples, directions of another component of magnetization could be determined in thermal demagnetization up to 672°C. These are assumed to represent the original magnetization of the Juniata Formation; they were acquired before the folding, and they show both normal and reversed polarities. The resulting pole position, at 31.5°N, 114,4°E (k = 55, α95 = 5°), falls directly in between published Middle Ordovician and Late Silurian pole positions for cratonic North America.