Paleomagnetism of the Front Range (Colorado) Morrison Formation and an alternative model of late Jurassic North American apparent polar wander

M. C. Van Fossen, D. V. Kent

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

Paleomagnetic study yields high-unblocking-temperature, dual-polarity magnetizations. With respect to known paleohorizontal, the inclinations (absolute mean=57.3°, 95% confidence interval=52.3° to 63.1°, N=8 sites) pass tilt and reversal tests, whereas the dispersion in declinations can be attributed to apparent or real tectonic rotations and sedimentary processes. The site-centered colatitudinal locus of possible Front Range Morrison poles partially overlaps the "upper' pole, but it excludes the "lower' pole from the Morrison Formation on the Colorado Plateau as well as the 151 Ma Glance conglomerate pole from the Basin and Range province of southeastern Arizona. We offer various explanations for these disparities and suggest an alternative model of Late Jurassic North American apparent polar wander through ~70°N which is supported by Late Jurassic European poles (with positive stability tests) transferred to North American coordinates. -Authors

Original languageEnglish (US)
Pages (from-to)223-226
Number of pages4
JournalGeology
Volume20
Issue number3
DOIs
StatePublished - Jan 1 1992

All Science Journal Classification (ASJC) codes

  • Geology

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