Here is a podcast series from the Open University in the U.K. that illustrates the vastness of geologic time. Check out the one called "The age of rocks".
This diagram shows some of the major events in Earth history. <--- Click on this image to see a bigger version. |
<--- Click on this image to see a bigger version. |
Be sure to learn about gaps in the sedimentary record: Unconformities (know the 3 types, see p. 200-202 in textbook).
a.) Types:
i.) A boundary that represents a major time break between flat-lying sedimentary layers: Disconformity.
ii.) A boundary between tilted sedimentary layers below + flat- lying ones above: Angular Unconformity.
iii. Contact between crystalline rocks (igneous or metamorphic rocks, ex. granite, schist, gneiss, diorite) below and overlying sedimentary layers = Nonconformity.
What is a Month =?
Julian Calendar = 365.25 days +
Gregorian Calendar (what we use)
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