Fifty years of obsidian hydration dating in archaeology

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Since its beginning in 1980, the Conservancy has now acquired 500 endangered sites in 43 states across America.

Examples of Conservancy preserves include California’s Borax Lake site, which encompasses 11,000 years of human occupation; the first mission of Father Kino, as well as several important Sinagua and Hohokam ruins in Arizona; important Caddo Indian sites in Texas and Oklahoma; and in Georgia, key cultural locales of the region’s first Indians.

Rasmus Nyerup's quote reminds us of the tremendous scientific advances which have taken place in the 20th century.

In Nyerup's time, archaeologists could date the past only by using recorded histories, which in Europe were based mainly on the Egyptian calendar.

During the period of a plant's life, the plant is taking in carbon dioxide through photosynthesis, which is how the plant makes energy and grows.

Animals eat plants, and some eat other animals in the food chain.

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