By Thom Holmes
From the preliminary symptoms of lifestyles within the Precambrian interval to the top of the Cambrian interval approximately 488 million years in the past, this quantity explores the advance of adolescence that culminated in a single of the main remarkable sessions within the evolution of existence on the earth.
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The unsung work of Smith was echoed in France by the work geologist Gérard Paul Deshayes (1795–1875). Deshayes was an Geologic Time 47 expert on fossil shells, and he obsessively cataloged nearly 3,000 individual species of extinct invertebrates and their associated rock strata around his native France. Like Hutton and Smith, Deshayes came to the conclusion that stratigraphic layers of rock had been laid down over long periods of time through natural forces that could be observed every day. By 1829, when Deshayes published his findings, he had become acquainted with the man who would successfully usher in the age of modern geologic study, Sir Charles Lyell (1797–1875).
The supercontinent Pangaea began to break apart about 200 million years ago. The breakup accelerated during the reign of the dinosaurs, which is why fossils of dinosaurs have now been found on every continent, including Antarctica. The continents approached their current configuration during the age of mammals, about 45 million years ago. The continents are still on the move. Ever so gradually, Australia is making the most noticeable shift. The land of koalas is on a slow collision course with Asia, the land of pandas.
This timescale is more difficult to grasp, 44 Geologic Time 45 however, when applied to prehistoric times. The human species, Homo sapiens, first appeared about 300,000 years ago. That is equal to about 12,000 successive generations of human beings, a figure that stretches the useful limits of the human scale of experiencing time. There can be more than one scale for measuring time, the human timescale being one of them. The scale by which time is measured depends largely on what is being measured.
Early life : the Cambrian period - Thom Holmes by Thom Holmes