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The Northern Basalt Flow Vernal Pools habitat is found in only four localities within the state. Time and erosion have split the volcanic plateau of Table Mountain into two sections, north and south. There are smaller ravines as well that support various types of trees and woodlands.
Three prominent, columnar jointed, cliff-forming lava flows can be seen on North Table Mountain, one exposed part way up the northwest slope, and two that form its cap. The Ralston Dike, a body of intrusive monzonite located about 2 miles (3.2 km) to the northwest, probably represents the volcanic vent from which the flows erupted. [6]
By this time the surrounding glacial ice had retreated, allowing basalt flows to spread over the Big Raven Plateau. [38] [105] The southern cinder cone, Cache Hill, formed during a period of eruptions on the western side of the Armadillo Highlands; basalt flows blocked a northwesterly flowing river in a broad valley to form a lava-dammed lake.
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.
Tataga-Matau Fortified Quarry Complex (AS-34-10), near the village of Leone on Tutuila in American Samoa, NRHP-listed, "a complex consisting of a series of basalt quarries and structures that archaeologists have interpreted as having a military defensive purpose. The site has been known since at least 1927, and was first formally surveyed in ...
The Precambrian and Paleozoic history of the Colorado Plateau is best revealed near its southern end, where the Grand Canyon has exposed rocks with ages that span almost 2 billion years. The oldest rocks at river level are igneous and metamorphic and have been lumped together as Vishnu Basement Rocks ; the oldest ages recorded by these rocks ...
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