Chapter 18, Problem 8A

Summary Introduction

Introduction:

Geological time scale consists of various eras namely Cenozoic, Mesozoic, Paleozoic, and Precambrian time. Precambrian is one of the longest in duration with about 87% of the total time analysis. It is a chronological time scale which classifies various organisms according to their features like seeded plants, vascular plants and ferns like conifers and cycads. It depicts the classification of the reptiles and amphibians. The time scale is divided into era, epochs, and periods. The periods are classified as primary, secondary, tertiary and quaternary.

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