Lord Kelvin and Clarence King calculated the length of time required for the Earth to cool from a white-hot liquid state; they eventually settled on 24 million years.
Until the 18th century, this question was principally in the hands of theologians, who based their calculations on biblical chronology.
In some areas, such as along the Santa Barbara Channel and San Francisco Bay, these villages developed a highly sophisticated technology, with widespread trade using native watercraft.
Boat construction reached its highest development in California among the Chumash.
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