Note for this question use the timescale at: http://www.straligraphy.org (follow

Question

Note for this question use the timescale at: http://www.straligraphy.org (follow links to Time Scale) or any other source that gives the ICS (International Commission on Stratigraphy) Time Scale (ie Google ICS Time Scale). The greatest extinction recorded in the fossil record took place 252.17 million years ago. On the geologic time scale, 252.17 million years marks boundary between which two periods? Name the two periods and note that you will only get full credit if you follow the exact definition of period on the time scale.

Explanation / Answer

Triassic period = 252.17 million years - 201.3 million years.

252.17m years boundary between two periods.that are Triassic period in Mesozoic era and Permian period in Paleozoic era.

Follow the definitions of era and period

Era: the major units of the geological time are called eras.

Period: each era has been subdivided into smaller time units called periods.

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