Plausible explanations for two major events in Earth history

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Authors
Jaye, Michael
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Date of Issue
2011
Date
2011-10-12
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Abstract
Pangaea was likely split by the simultaneous impact of two large asteroids: one tore through the region between what is now South America and Antarctica, coming to rest over 1000 miles to the east, while the other's remnants are found southeast of the Yucatan Peninsula and north of Columbia and Venezuela. Presumed impact trails and craters, approximately 500 miles in diameter, are readily observable via Google Maps (satellite). The force of the impacts likely pushes Africa away from its initial locale, and drags North and South America from theirs. India would have been just east of impact "ground zero" - it would be propelled with great- est initial velocity from its original location, eventually slamming into Asia and forming the Himalayan range. Deformations in the seabed, essentially "wakes" created by land mass tran- sits, remain in ocean floors. North and South America would be torn from the region extending from Kamchatka southward to just east of Australia. The Andes and Rocky Mountains would form from the impacts - the land deforms before the force of the impacts releases the con- tinents on their eastward slide. The Atlantic ridge would form due to buckling, as continental transits halted. All this might have taken minutes rather than millennia. The southern impact could have created the planet's obliquity: the direction of the final 700 miles of the northern impact trajectory bends approximately 23' from its initial direction. The dual impacts' easterly direction would affect the rotation of the plane~ altering the planet's "day." Impact boundary regions remain seismically active to the present. Subsequently, rivers draining substantial basins from what is now California contributed to the formation of Monterey Canyon. The canyon was likely formed above the ocean s surface- its associated river system, extending nearly 70 miles into the Pacific basin, created oxbows, one of which is nearly 50 miles off the coast (visible in Google Maps) where seabed gradients are much lesser than at the coasl. The system is well preserved. At its extent, the complex is submerged 3.6 km beneath the present ocean surface. Such a volume of water could not have terrestrial origin. Evidence of a subsequent, less energetic impact of sufficient size to add the volume is identified in the Southern Ocean and offered as a plausible explanation.
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Abstract
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Defense Analysis (DA)
Organization
Naval Postgraduate School (U.S.)
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Format
1p. session description; 24 slides
Citation
Jaye, Michael. "Plausible explanations for two major events in Earth history." 2011 GSA Annual Meeting in Minneapolis. 2011.
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
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