Paleomagnetism and Counterclockwise Tectonic Rotation of the Eocene-Oligocene Lyre, Quimper, and Marrowstone Formations, Northeast Olympic Peninsula, Washington State, USA

Prothero, Donald R.; Draus, Elizabeth; Nesbitt, Elizabeth A.; Smiley, Tara M.; Burns, Casey

doi:10.1127/0078-0421/2009/0043-0127

Cited by 4 publications

(2 citation statements)

References 16 publications

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“…These results include the middle Eocene Humptulips Formation in the southwestern Olympics [57,58] [59]) also yielded a counterclockwise rotation. These rocks yielded both normal and reverse polarity magnetizations, which passed a reversal test and resulted in a formation mean direction of D = 308.4, I = 51.0, k = 6.7 and α 95 = 9.5.…”

Section: Tectonic Rotationmentioning

confidence: 83%

“…Because there is 1200 or more meters of reverse section in this sequence, we prefer the latter correlation. However, if the Hoko River Formation interfingers with the underlying Lyre Formation, then it is more likely that the correlation with Chron C17r is correct because the Lyre River Formation is correlated with the same interval (Prothero et al, [59]). Without planktonic microfossils or some sort of isotopic age determination, it is not possible to provide a more robust correlation on the Hoko River Formation.…”

Section: Hoko River Formation Type Section Hoko River-ozettementioning

confidence: 99%

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Magnetostratigraphy and Tectonic Rotation of the Eocene-Oligocene Makah and Hoko River Formations, Northwest Washington, USA

Prothero

Draus

Burns

2009

International Journal of Geophysics

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The Eocene-Oligocene Makah Formation and subjacent middle Eocene Hoko River Formation of the northwestern Olympic Peninsula, Washington, yield mollusks, crustaceans, foraminifera, and early neocete whales; their age has never been precisely established. We sampled several sections; most samples showed a stable single-component remanence held largely in magnetite and passed a Class I reversal test. The upper Refugian (late Eocene) and lower Zemorrian (early Oligocene) rocks at Baada Point correlate with Chron C13r (33.7-34.7 Ma) and Chron C12r (30-33 Ma). The Ozette Highway section of the Makah Formation spanned the early Refugian to late Refugian, with a sequence that correlates with Chrons C15r-C13r (33.7-35.3 Ma), and a long reversed early Zemorrian section that correlates with Chron C12r (30-33 Ma). The type section of the Hoko River Formation correlates with Chron C18r (40.0-41.2 Ma). The area sampled shows about 45• of post-Oligocene counterclockwise tectonic rotation, consistent with results obtained from the Eocene-Oligocene rocks in the region.

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Section: Tectonic Rotationmentioning

confidence: 83%

Section: Hoko River Formation Type Section Hoko River-ozettementioning

confidence: 99%