Ocean, the - precambrian - More Information About the Late Precambrian - scotese.com


In addition to the altimeters, the TOPEX Microwave Radiometer (TMR) operating at 18, 21, and 37 GHz was used to correct for atmospheric wet path delay. [ clarification needed ]

The boundary between the Ediacaran Period of the Proterozoic Era and the Cambrian Period of the Paleozoic Era is not as clear-cut as it was once thought to be. It used to be thought that increasing oxygenation caused a mass extinction of Ediacaran forms and a geologically sudden proliferation of new complex forms. Now it is understood that there were many complex multicellular animals capable of living in the higher oxygen of the Ediacaran environment. However they were nearly all soft-bodied forms, which left few fossil traces behind for us to find. The relative abundance of Cambrian fossils represents an increase in animals with calcified body parts, which were easily fossilized, not a mass extinction of Ediacaran life as was once thought.

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On the basis of all these factors, it may be assumed that the Americas were joined with Europe and Africa until approximately 190 million years ago, when a rift split them apart along what is now the crest of the Mid-Atlantic Ridge . Subsequent plate movements averaging about 2 cm ( inch) per year have taken the continents to their present position. It seems likely, though it is still unproven, that this breakup of a single landmass and the drifting of its fragments is merely the latest in a series of similar occurrences throughout geologic time.

First Life
The first life formed. This was not cell life as we know it, but it was life just the same. The oceans were not like the oceans of today. Some say they were thick like soup. The chemistry of the oceans made them the perfect place for life to begin.

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