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The Calabozos caldera complex : geology, petrology, and geochemistry of a major silicic volcanic center and hydrothermal system in the southern Andes (1986) Anita Lizzie Grunder is geologist known for her research on volcanic rocks and defining changes in volcanism over geologic eras. She is an elected fellow of the Geological Society of America .
Oregon Country. American and Hudson's Bay Company flags were used. Oregon Country was a large region of the Pacific Northwest of North America that was subject to a long dispute between the United Kingdom and the United States in the early 19th century. The area, which had been demarcated by the Treaty of 1818, consisted of the land north of 42 ...
Width. 50 mi (80 km)SW–NE [3] The Brothers Fault Zone (BFZ) is the most notable of a set of northwest-trending fault zones including the Eugene–Denio, McLoughlin, and Vale zones that dominate the geological structure of most of Oregon. These are also representative of a regional pattern of generally northwest-striking geological features ...
The Three Sisters are closely spaced volcanic peaks in the U.S. state of Oregon. They are part of the Cascade Volcanic Arc, a segment of the Cascade Range in western North America extending from southern British Columbia through Washington and Oregon to Northern California. Each over 10,000 feet (3,000 meters) in elevation, they are the third ...
A Metasequoia occidentalis fossil, from the same species as Oregon's official state fossil. Paleontology in Oregon refers to paleontological research occurring within or conducted by people from the U.S. state of Oregon. Oregon's geologic record extends back approximately 400 million years ago to the Devonian period, before which time the state ...
The Coyote Butte Limestone ( OR085) is a geologic formation in Oregon. It preserves fossils dating back to the Sakmarian to Kungurian stages of the Permian period, [1] spanning an estimated 23 million years. [2] [3] The formation occurs in isolated buttes to the north; Triangulation Hill, and south; type locality and name giver Coyote Butte and ...
Coos Bay is Oregon's most important coastal industrial center and international shipping port, with close ties to San Francisco, the Columbia River, Puget Sound and other major ports of the Pacific rim. [3] The city of Coos Bay is located on the peninsula formed by the inside of the loop of the bay.
The Northern Oregon Coast Range is the northern section of the Oregon Coast Range, in the Pacific Coast Ranges physiographic region, located in the northwest portion of the state of Oregon, United States. This section of the mountain range, part of the Pacific Coast Ranges, contains peaks as high as 3,710 feet (1,131 m) for Rogers Peak. [ 1]