Author Archives: gymnosperm

Differential Motions of the Continents, Mesozoic and Cenozoic Eras V: The 80mya Inflection

In the last post on constraints we decided that the east Pacific and Juan de Fuca ridges were useless in constraining the motions of the Americas. We decided that the Atlantic, Greenland, and Lomonosov ridges were acceptable explanations for the … Continue reading

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Differential Motions of the Continents, Mesozoic and Cenozoic Eras IV: Constraints

We know the position and velocity of stable points on our six cratons. A reasonable question to ask is, “Can we account for this motion?” Above is a map of the ocean floor created in the last 10 million years. … Continue reading

Posted in Geology, Paleogeography | 1 Comment

Differential Motion of the Continents, Mesozoic and Cenozoic Eras III: North America and Eurasia

In the first post in this series we set the goal of using motion vectors of the continents to analyze the forces exerted on them, and described the motions of Africa and South America. In the second post we described … Continue reading

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Differential Motions of Continents, Mesozoic and Cenozoic Eras II: Antarctica and Australia

In the first post of this series we explored the rationale for extending precise analysis of continental motion only 250 million years. The ultimate goal of this exercise is to develop rigorous constraints on the forces creating the different motions, … Continue reading

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Differential Motions of Continents, Mesozoic and Cenozoic Eras

The total volume of ocean floor production becomes increasingly difficult to constrain as we work backwards in time. Ocean floor is increasingly lost to subduction, and efforts to replicate the missing parts become speculation. The continents, by contrast, have grown … Continue reading

Posted in Continental Wander Path, Paleogeography | 2 Comments

The Pacific Triangle, Take III

Essentially, the Pacific Triangle IS┬áthe Pacific Plate. Unless you wish to consider it a sinkhole, a point subduction zone, all that we know as the Pacific Plate has grown out of this spot in the last 175 million years. Seafloor … Continue reading

Posted in Continental Wander Path, Geological Evolution of the Western United States, Seafloor Isochrons | 1 Comment

The Cretaceous Superchron, Beaufort Isochrons, and the Motion of North America

In the last post we explored a very peculiar set of seafloor isochrons in the Beaufort Sea and Arctic ocean. We found that a perpendicular shift in seafloor spreading defined the Cretaceous Normal Superchron, the longest known period in earth … Continue reading

Posted in Continental Wander Path, Cretaceous normal superchron, Geography, Magnetic Reversals, Paleogeography | Leave a comment