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The Columbia River Basalt Group (including the Steen and Picture Gorge basalts) extends over portions of four states. The Columbia River Basalt Group (CRBG) is the youngest, smallest and one of the best-preserved continental flood basalt provinces on Earth, covering over 210,000 km 2 (81,000 sq mi) mainly eastern Oregon and Washington, western Idaho, and part of northern Nevada. [1]
Latourell is unique among the best-known Columbia Gorge waterfalls, in the way that it drops straight down from an overhanging basalt cliff. Most of those falls (even the famous Multnomah Falls) tumble to some degree. Latourell Falls is an excellent example of columnar basalt formations.
Basalt columns seen on Porto Santo Island, Portugal. Columnar jointing of volcanic rocks exists in many places on Earth. Perhaps the most famous basalt lava flow in the world is the Giant's Causeway in Northern Ireland, in which the vertical joints form polygonal columns and give the impression of having been artificially constructed.
Horsetail Falls (or Horse Tail Falls) is a waterfall located on Horsetail Creek along the Columbia River Gorge in Multnomah County, in the U.S. state of Oregon. [1] The falls drop over a cut over the columnar basalt cliff within the Oneonta Gorge. [2] It is one of the waterfalls along the Columbia River Highway's waterfall corridor. [3]
Columnar jointing in Giant's Causeway in Northern Ireland Columnar jointing in the Alcantara Gorge, Sicily. Columnar jointing is a geological structure where sets of intersecting closely spaced fractures, referred to as joints, result in the formation of a regular array of polygonal prisms (basalt prisms), or columns.
Crown Point (also known historically as Thor's Heights or Thor's Crown) [1] [2] is a basalt promontory on the Columbia River Gorge and an associated state park in the U.S. state of Oregon. It is located in eastern Multnomah County , approximately 15 miles (24 km) east of Portland .
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The Columbia Plateau is an important geologic and geographic region that lies across parts of the U.S. states of Washington, Oregon, and Idaho. [1] It is a wide flood basalt plateau between the Cascade Range and the Rocky Mountains , cut through by the Columbia River .