Obsidian hydration is not effective on surfaces that are uneven due to gradual weathering caused by natural forces.
The volcanic glass of Obsidian Cliff in Yellowstone National Park is a National Historic Landmark, and was an important source of raw material for the manufacture of stone tools by Native Americans.
Ancient sites in England, Malta, and elsewhere turned out to be older than once thought.
With this new information, scientists were able to paint a more accurate picture of European prehistory. An absolute dating method tells the excavator the specific date of the material being studied (plus or minus a margin of error).
To find out more about obsidian and its importance to people who once occupied national park land, search for “obsidian” on the National Park Service home page.
Thermoluminescence dating is used for rocks, minerals, ceramics and burned features.
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Turning to carbon-14 dating, the archaeologist might discover that the bone dates from 3,500 years ago. It involves putting things into a sequence based on their relative ages.
It (1) reviews how this dating technique was first discovered and applied, (2) details our current knowledge of the process of hydration and which variables affect its rate, (3) discusses the relative advantages and limitations of the three primary approaches employed to construct hydration chronologies, and (4) presents a protocol for its future application in Mesoamerica.
The synthesis of this body of hydration-dating research may help archaeologists more constructively decide how and when to apply this unique and versatile dating technique to their specific research questions by providing the information and guidelines necessary for recovering pertinent field data.
SYNONYMS OR RELATED TERMS: hyalopsite, Iceland agate, mountain mahogany CATEGORY: geology DEFINITION: A jet-black to gray, naturally occurring volcanic glass, formed by rapid cooling of viscous lava.
It was often used as raw material for the manufacture of stone tools and was very popular as a superior form of flint for flaking or as it is easily chipped to form extremely sharp edges.