The Great Infra-Cambrian Ice Age There is considerable geological evidence for an extensive glaciation some 600 million years ago. Its end caused an alteration of climate that made possible the ...

Learn more about a time period marked by an intense burst of evolution. 3 min read The Cambrian period, part of the Paleozoic era, produced the most intense burst of evolution ever known.

In the earliest Cambrian, organisms with hard skeletons emerged, and by Cambrian Age 3, ecosystems flourished with a marked increase in animal diversity. One pivotal group in this evolutionary ...

placing the fossils in an environmental context that is dramatically different from other fossil assemblages of the Cambrian ...

The average retirement age for Americans is 62. The average retirement age has increased by a few years since the early 1990s, when the average American retired at 57. The expected retirement ...

PROF. B. SAHNI'S important observations 1 have necessitated a reconsideration of this problem. In order to review the geological evidence on the ground, an excursion was arranged to examine ...