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Who's on First, University of California, Berkeley. This website is a book chapter about geologic time. This online version of their informative booklet contains short, content explanations about relative time, major geologic time divisions, index fossils for use in age dating, radiometric dating and the age of the earth.

This 5-12-grade activity introduces students to the idea of sequencing information in overlapping data sets and the Principle of Superposition, which is a core concept in relative dating. Offers history of age dating, stratigraphic principles, rock correlation, fossil correlations, radiometric dating, and the geologic time scale. Short discussion of radioactive dating and stratigraphic principles.

The secondary rocks were thought to include interlayered basalts, which Werner thought formed by combustion of buried coal layers.

The Scottish geologist James Hutton (1726-1797) argued that granite and basalt by solidification within the earth (as opposed to precipitating in from oceanwater).

If a geologist claims to be 45 years old, that is an absolute age.

Superposition: The most basic concept used in relative dating is the law of superposition.

-Guide fossil (index fossil)- fossil with a short range (lived for a short period of time). and are ~3.9 BY old -meteorites and some moon rocks, however, dated at ~4.6 BY; believed to have formed at same time as Earth; age of Earth, therefore, believed to be ~4.6 BY.

-Assemblage range zones- use more than 1 fossil in rock layer; area of age overlap is age (figs. Relative geologic time scale- early geologists constructed based on correlation of rocks from all over world (mostly by fossils); only relative geologic time periods, no actual dates (fig. Absolute Dating Specific age given in number of years before present.

Hutton viewed tilted strata as having been initially deposited horizontally, and then were subsequently deformed (tilted and folded) by the forces of Earth's internal heat engine.Geologists generally know the age of a rock by determining the age of the group of rocks, or formation, that it is found in.The age of formations is marked on a geologic calendar known as the geologic time scale.The Auckland Islands lie approximately 375km south of Stewart Island on the Campbell Plateau.These islands were formed by multiple geological events.

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