Henry Farney Obsidian Mountain In The Yellowstone

Obsidian Cliff, also known as 48YE433, was an important source of lithic materials for prehistoric peoples in

Yellowstone National Park Yellowstone National Park is an American national park located in the western United States, largely in the northwest corner of Wyoming and extending into Montana and Idaho. It was established by the 42nd U.S. Congress with the Yellowst ...

near Mammoth Hot Springs, Wyoming,

United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territori ...

. The cliff was named by

Philetus Norris Philetus W. Norris (August 17, 1821 – January 14, 1885) was the second superintendent of Yellowstone National Park and was the first person to be paid for that position. Early life Philetus Walter Norris was born in Palmyra, New York on Aug ...

, the second park superintendent in 1878. It was declared a

National Historic Landmark A National Historic Landmark (NHL) is a building, district, object, site, or structure that is officially recognized by the United States government for its outstanding historical significance. Only some 2,500 (~3%) of over 90,000 places listed ...

in 1996. and The cliff was formed from thick rhyolite lava flow that occurred about 180,000 years ago. The vertical columns are cooling fractures that formed as the thick lava flow cooled and crystallized. The Cliffs stands at an elevation of nearly above sea level and goes on for about half a mile. The cliffs also extend between 150 and 200 feet above Obsidian Creek. The flow consists of obsidian, a dark volcanic glass. The obsidian is most abundant at the base of the cliff and slowly tapers off to larger concentrations of

pumice Pumice (), called pumicite in its powdered or dust form, is a volcanic rock that consists of highly vesicular rough-textured volcanic glass, which may or may not contain crystals. It is typically light-colored. Scoria is another vesicular v ...

at the top. Obsidian from this site was first quarried here about 12,000 years ago. Early natives of North America placed a high value on the obsidian that came from this cliff as well as other similar obsidian deposits in the area because numerous tools could be fashioned from obsidian—most popularly, knives, spear/arrow tips, and other sharp-edged objects. In fact, obsidian from Obsidian Cliff was so sought after in early America (before the time of Columbus) that it was traded as far away as Ohio and Canada. Many studies have been done on the composition of the obsidian from Obsidian Cliff and how the obsidian from Obsidian Cliff was distributed. This research has provided evidence of the direction and extent of prehistoric trade networks. It is located about south of Mammoth Hot Springs, on the east side of the Mammoth-Norris section of the Grand Loop Road. The Obsidian Cliff Kiosk, just north, is also listed on the National Register. Obsidian Cliff is also located on the northern end of Beaver Lake in Yellowstone National Park.

Notes

External links

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Obsidian Cliff National Historic Landmark
at the Wyoming State Historic Preservation Office {{Authority control Landforms of Yellowstone National Park Cliffs of the United States Landforms of Park County, Wyoming Volcanism of Wyoming Native American history of Wyoming National Historic Landmarks in Wyoming Natural features on the National Register of Historic Places in Wyoming Archaeological sites on the National Register of Historic Places in Wyoming National Register of Historic Places in Park County, Wyoming

Cliff In geography and geology, a cliff is an area of rock which has a general angle defined by the vertical, or nearly vertical. Cliffs are formed by the processes of weathering and erosion, with the effect of gravity. Cliffs are common on co ...

Quarries in the United States