two time line diagrams – boundaries of science crn-52926
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3/17/2015 Two Time Line Diagrams – BOUNDARIES OF SCIENCE CRN52926...
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Course Content ... Week Eight I am not counting Intercession here. Two Time Line DiagramsH
Two Time Line Diagrams
Figure 1 Beginning of the Earth until the present
FIGURE 1 The three eons of geologic history are laid out linearly on this spiral diagram. The most recent eon, the Phanerozoic, is divided into epochs, as illustrated in further detail in Figure 2. The chronological order of the various subdivisions of time constitutes the relative geologic timescale. Modern methods of dating and fossils have allowed geologists to correlate the relative scale with an absolute scale of years. Absolute ages in this diagram are given 1 billion years). Note: In many geology and natural science books, all geologic time before the Phanerozoic eon is referred to as Precambrian time.
Time of the Big Animals (Reptiles, etc.)
Two Time Line Diagrams
My BlackboardDaniel Caraincica
3/17/2015 Two Time Line Diagrams – BOUNDARIES OF SCIENCE CRN52926...
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FIGURE 2 The entire Phanerozoic eon, which constitutes the most recent 570 million years of geologic history, is laid out linearly along are collectively known as the Carboniferous perioda time of rampant growth of plants that later became compressed underground to form coal (a form of carbon]. Not labeled on this the Pliocene epoch, 5 to 2 million years ago; the Pleistocene epoch, 2 million to 10,000 years ago; and the Holocene (or Recent) epoch, 10,000 years various eras, periods, and epochs are based on significant changes in the fossil record. One such division is the famous KT (CretaceousTertiary) boundary, which also divides the Mesozoic Cenozoic eras. The mass extinction of all dinosaurs and many other forms of life at the KT boundary paved the way for the ascendancy of mammals during