Mountain building and extinctions mark the end of the eras of geologic time.

Name: Mountain building and extinctions mark the end of the eras of geologic time.
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Mountain building and extinctions often mark the major transitions between eras in geologic time. For example, the end of the Paleozoic Era was marked by the Permian extinction and the beginning of the Mesozoic Era was marked by the uplift of the supercontinent Pangaea and the formation of new mountain ranges.

Mountain Building and Extinctions Mark the End of the Eras