Eon in years
[DOC File]Geologic Time
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3 components in construction of scale: Stratigraphic scale (relative time) Chronometric scale (absolute ages) Calibrate the stratigraphic scale. Precambrian time scale mainly chronometric (i.e. radiometric).
[DOC File]Geologic Time Activity Worksheet
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Rocky Mountains are formed 80 million years First known fish 510 million years Paleozoic Era begins Earliest humans 2 million years Formation of the Earth 4.6 billion years First known mammal 200 million years Proterozoic Eon begins First single-celled organism 1.2 billion years Columbus discovers America 506 years Oldest rock 3.8 billion years ...
[DOC File]Use the geologic time scale to find the missing dates and ...
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Chapter 8—Earth’s Formative Stages and The Archean Eon. CHAPTER OUTLINE FOR TEACHING . I. Earth’s Formative Interval: Archean. A. Duration of 2.1 Billion Years. B. For the Initial 560 Million Years, There is ... The early atmosphere must have gradually accumulated some oxygen by about 2.5 billion years ago as indicated by the occurrence ...
[DOC File]EON
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Eon, billions of years ago, is divided by the . Cambrian boundary. when the variety of life forms exploded. An . Era. includes mass extinctions that mark the boundaries between eras. A . Period. includes blocks of time when a unique rock series was laid down. Fossils.
[DOC File]Major events in Earth’s geologic history
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769 The eon that began about 540 million years ago is called the Phanerozoic, Greek for “visible life”. 770 The sedimentary rocks and deposits of Phanerozoic eon contain an abundance of fossils. 771 The Phanerozoic eon is divided into units called eras. 772 The era names refer to import differences in dominant life-forms.
[DOC File]The geologic time scale
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Why do you think the Phanerozoic Eon has many more divisions and dates associated with it than the Archean Eon? 5. How many years does the first 10 yards represent? What events are within the first 10 yards of the football field from the TODAY end zone? Explain …
[DOC File]Geologic Time Scale:
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EON ERA Period Epoch YEARS AGO WHAT WAS HAPPENING ON EARTH Precambrian 4.6 billion – 570 million years ago (mya) 3.5 billion years ago Cyanobacteria found in fossil record Invertebrates found in fossil record end of Precambrian 1.5 billion ya Grenville supercontinent existed 700mya Grenville supercontinent begins to breakup Phanerozoic
Convert Aeons to Years (eon to yr) ― JustinTOOLs.com
Archeozoic Eon (Archean) 3.9 to 2.5 billion years ago - - "Ancient Life" - The first life forms evolve - one celled organisms. Blue-green algae, archaeans, and bacteria appear in the sea. This begins to free oxygen into the atmosphere. Hadean Eon 4.6 to 3.9 billion years ago - - "Rockless Eon" - The solidifying of the Earth's continental and ...
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