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Choose: No Frames Layout Choose: Human Evolution Frames .I have integrated this web page on human evolution into an electronic text, " Nature's Holism - Holism.This clock representation shows some of the major units of geological time and definitive events of Earth history.The Hadean eon represents the time before fossil record of life on Earth; its upper boundary is now regarded as 4.0 Ga (billion years ago).
methods rely on characteristic faunal and geological patterns to bracket the period when the fossil existed.
This lesson is based on an online booklet that provides an introduction to the study of earth's history, published by the USGS.
Using careful analogies and written historical records, the authors help students understand the development of the geologic time scale, including how this depended on gathering evidence and making comparisons.
Overview of Methods Superposition Stratigraphy Dendrochronology Radiocarbon C14 Radiometric Dating Methods Obsidian Hydration Dating Paleomagnetic/Archaeomagnetic Luminescence Dating Methods Amino Acid Racemization Fission-track Dating Ice Cores Varves Pollens Corals Cation Ratio Fluorine Dating Patination Oxidizable Carbon Ratio Electron Spin Resonance Cosmic-ray Exposure Dating This is an excellent overview of dating methodologies, and is a chapter in a textbook on Archaeology.
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Sellwood, 1992; British Geological Survey, Geology of the country around Brighton and Worthing, B.