It not only provided the basis for confirming the hypothesis of sea floor spreading, but it also was a technique for quantifying rates and amounts of crustal plate movements on a global scale.
32.
The Austin Chalk formation is filled with micro-organisms known as coccoliths, and are a product of the warm waters that were displaced from the increased sea-floor spreading at the time.
33.
Australia began to separate from Antarctica perhaps 80 Mya ( Late Cretaceous ), but sea-floor spreading between them became most active about 40 Mya during the Eocene epoch of the Paleogene Period.
34.
Merrill said it was " probably the best explanation " for the data, but he expressed concern over how different the magnetic patterns on Mars are from the sea-floor spreading seen on Earth.
35.
Some of " Eltanin "'s research cruises collected magnetic profiles of the sea floor that proved to be pivotal evidence in the acceptance of the continental drift theory, by proving the existence of sea floor spreading.
36.
This volcanism ended 94 Ma after which sea-floor spreading divided the LIP into the Agulhas Plateau ( south of South Africa ), Northeast Georgia Rise ( near South Georgia Island off South America ), and Maud Rise.
37.
Thus, the new mobilistic concepts neatly explained why the Earth does not get bigger with sea floor spreading, why there is so little sediment accumulation on the ocean floor, and why oceanic rocks are much younger than continental rocks.
38.
Rifting in the central segment, however, coincided with the Cretaceous Normal Superchron ( also known as the Cretaceous quiet period ), a 40 Ma period without magnetic reversals, which makes it difficult to date sea-floor spreading in this segment.
39.
Stretching for hundreds of miles north and south of Eastern Island, 2, 000 miles off the coast of Peru and Chile, this long line of volcanoes is caused by sea floor spreading along the great continental plates of the earth's crust.
40.
During the Late Cretaceous and Early Oligocene, the earliest period of tectonic stretching of continental crust and formation of horsts, half-grabens, and rotated fault-blocks occurred in association the rifting and later sea-floor spreading that created the South China Sea.
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