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geologic time |
Also found in: Dictionary/thesaurus, Wikipedia, Hutchinson | 0.02 sec. |
geologic timeInterval of time occupied by the Earth's geologic history, extending from c. 3.9 billion years ago (corresponding to the age of the oldest known rocks) to the present day. It is, in effect, the part of the Earth's history that is recorded in rock strata. The geologic time scale is classified in nested intervals distinguished by characteristic geologic and biologic features. From longest to shortest duration, the intervals are eon, era, period, and epoch. geologic time [¦jē·ə¦läj·ik ′tīm] (geology) The period of time covered by historical geology, from the end of the formation of the earth as a separate planet to the beginning of written history. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| The water was quite free from reptiles, and the vegetation upon the banks of the river had altered to more open and parklike forest, with eucalyptus and acacia mingled with a scattering of tree ferns, as though two distinct periods of geologic time had overlapped and merged. |
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