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A megaannus (Ma) represents one million (10 6) years. The geologic time scale or geological time scale (GTS) is a representation of time based on the rock record of Earth.
Witness how Earth's forces have shaped the continents—from millions of years ago to present day. Today’s configuration of continents is dramatically different than it was in the past. See how...
22 Μαΐ 2008 · move them from thinking a million years is impossibly long (“never in a million years”) to thinking that a million years is “a blink of an eye” in the history of the Earth.
Geologists measure events in Earth’s history in years before the present date. They use certain conventions, however, for abbreviating intervals of time. One-thousand years is represented by the abbreviation “ Ka,” which means “kilo annum.” The prefex “kilo” should be familiar to you: a kilogram equals one-thousand grams and a ...
On the back of this sheet is a chart showing the geologic eras, systems, and series; the oldest is at the bottom. On the chart, each dot, number, or letter represents 1 million years. The dots get “older” as you read down the chart, or to the right along a row.
At that rate, each hour of the year is equivalent to approximately 500,000 years, and each day is equivalent to 12.5 million years. If all of geological time is compressed down to a single year, Earth formed on January 1, and the first life forms evolved in late March (~3,500 Ma).
Using a 2.5 m long roll of paper, create your own geologic time scale using the following scale: 1 cm = 20 million years. For the purpose of this exercise, round Earth’s age to 4.6 Ga and use a tick mark spacing of every 100 myrs.
