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Smith Rock State Park viewed from space in 1973. The geology of Smith Rocks is volcanic. It is made up of layers of recent basalt flows overlaying older Clarno ash and tuff formations. Approximately 30 million years ago, a large caldera was formed (Crooked River caldera) when overlying rock collapsed into an underground magma chamber. This ...
Smith was born in the village of Churchill, Oxfordshire, the son of John Smith (1735–1777), the village blacksmith, and his wife Ann (née Smith; 1745–1807). [3] His father died when Smith was eight years old, and he and his siblings were raised by his uncle, a farmer also named William Smith. [4]
The Crooked River caldera is a large and ancient volcano that straddles three central Oregon counties. The diameter of the caldera is about 41 by 27 kilometres (25 mi × 17 mi) and is notable for the welded tuff present at Gray Butte, Smith Rock, Powell Buttes, Grizzly Mountain and Barnes Butte.
In geology, rock or superficial deposits, fossils and lithologies can be used to correlate one stratigraphic column with another. Prior to the discovery of radiometric dating in the early 20th century, which provided a means of absolute dating , archaeologists and geologists used relative dating to determine ages of materials.
Smith Rock may refer to: Smith Rock State Park, a park in Central Oregon, U.S., famous for rock climbing; Smith Rock Shelter, limestone overhang in McKinney Falls State Park near Austin, Texas, U.S. See also. Smith Rocks (Antarctica) Chris Rock–Will Smith slapping incident (Smith–Rock slap)
Smith Rock State Park, off U.S. Route 97 about 3 miles (5 km) east of Terrebonne, [21] has thousands of rock climbing routes as well as hiking and biking trails in a rugged canyon setting. [19] The ancestral Crooked River helped create the crags and pinnacles in this park by eroding the interior of a volcanic vent over millions of years. [21]
This principle, which received its name from the English geologist William Smith, is of great importance in determining the relative age of rocks and strata. [1] The fossil content of rocks together with the law of superposition helps to determine the time sequence in which sedimentary rocks were laid down.
Smith's was the first national-scale geological map, and by far the most accurate of its time. His pivotal insights were that each local sequence of rock strata was a subsequence of a single universal sequence of strata and that these rock strata could be distinguished and traced for great distances by means of embedded fossilized organisms.