Grand Canyon Rewrites Cambrian Explosion

This is a U.S. news story, published by MSN, that relates primarily to Eddy McKee news.

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classic geological model

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Tonto Group

Newsweek

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Grand Canyon Discovery Rewrites Textbooks on Key Point in History of Life

Summary

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88% Informative

A U.S. team of researchers studied the "Tonto Group ", a collection of five rock formations exposed along the sides of the canyon.

The rocks in the Grand Canyon were used nearly 80 years ago by the geologist Eddy McKee to form the classic geological model for the advance of seas across continents.

Instead of one major transgression, there are in fact five sedimentary sequences, the lower three of which are separated by gaps in the rock record where material was eroded away.

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Neutral language

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formal

Language

English

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not offensive

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not hateful