Question

Part G. Geologic Time Questions (left diagram) 23. The individual layer-units (periods) of geologic time in the column are based on Part G. Answers (see right diagram) A. similar rock types B. similar layer thicknesses C. similar fossil assemblages D. similar mode of origin E. similar world-wide occurrence

Answer 1

Part-G. A. Similar rock types.

Eras (based on the appearance and extinction of fossils) are divided into Periods. A unit of geologic time in which a a single type of rock system is formed is Period. Cambrian is a Period of Paleozoic Era.