This chart shows the way geologic time is broken down into smaller spans of time called Eons, Eras, Periods, and Epochs. The top of the chart is current time, labeled as 0 Ma (0 years before present). The bottom of the chart represents the beginning…
Letter from Will D. Campbell, director of Katallagete, the magazine of the Committee of Southern Churchmen, and James Y. Holloway, the publication's editor, urging recipients to contribute to a fund in support of Fannie Lou Hamer.
(no number) Preserved ivory varies widely in appearance from one site to the next, but the tusk itself can easily be mistaken for petrified wood because it forms concentric rings as the animal grows. Tusk fragments are generally thin, with a slight…