Evidence of Northwest Movement of Land in Western North America

Evidence of Northwest Movement of Land in Western North America

My theory supposes that western North America was composed of the western upland edge of the Pacific plate and the northward moving Siberian tail. At the time of making this supposition, I knew of no on-the-ground evidence that would either support or refute this supposition.

Let's remember that the entire North American continent is currently moving slightly to the south as it also moves west. I have been making the assumption of northward movement of the Siberian tail in the face of the fact that the continent as a whole has been moving to the south.

During 2015, there were three separate articles that show evidence of significant northward movement of the area that I refer to as the Siberian tail during the past 100 million years.

First, there is a paper entitled "Dismemberment and northward migration of the Cordilleran orogen: Baja - BC resolved" by Robert S. Hildebrand of the Dept. of Earth & Planetary Sciences a UC, Davis.

Hildebrand notes that paleomagnetic evidence implies "that a major portion of the coastal cordillera of British Columbia migrated northward >1000 km between 90 and 60 Ma."

Hildebrand continues, "In this contribution, I show that meridional migration within the Cordillera was not confined to narrow slivers along the coast, but instead involved the entire width of the Cordillera, from the Laramie fold-thrust belt westward …"Hildebrand further states that "The overlapping nature of the geology along both the Lewis & Clark transverse zone and the Texas Lineament, their similar orientations, and the observation that both appear to be truncated at the Laramie fold-thrust belt, suggest that the two zones were once continuous and separated during the Laramie event on one or more faults in, or adjacent to, the thrust belt. Currently the two zones are ~1300 km apart."

In other words, from my theory's point of view, somewhere during the past 100 million years, a big hunk of the Siberian tail moved 1300 km northward, while the remainder of the tail end was frozen in place and resides in Mexico, having been cut off by the Laramie orogeny.

Another paper by Mikhail Kaban et. al., entitled "Cratonic root beneath North America shifted by basal drag from the convecting mantle," says "That the craton below the North American continent is extremely deformed: its root is shifted relative to the center of the craton by 850 kilometers towards the west-southwest."

This deformation may be a different aspect of the same phenomenon that Hildebrand writes about.

A third paper makes an interesting passing reference to this same subject. Writing about dinosaurs in Washington State, Brandon R. Peecock and Christina A. Sidor note that dinosaurs were not found much in Washington State because much of the land was under water. They say, "Eighty million years ago, the rocks that form Sucia Island were likely deposited farther south. How much farther south is a topic of scientific debate, with locations ranging between present-day Baja California, Mexico, and Northern California."