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The Chazy Reef Formation is a mid-Ordovician limestone deposit in northeastern North America. It consists of some of the oldest reef systems built by a community of organisms [ 1 ] rather than the deposit of a limited range of similar organisms, such as Stromatolite mounds deposited by ancient cyanobacteria.
The map of North America with the Western Interior Seaway during the Campanian. The Western Interior Seaway (also called the Cretaceous Seaway, the Niobraran Sea, the North American Inland Sea, or the Western Interior Sea) was a large inland sea that split the continent of North America into two landmasses for 34 million years.
Moonstone cabochon. The most common moonstone is of the orthoclase feldspar mineral adularia, named for an early mining site near Mt. Adular in Switzerland, now the town of St. Gotthard. [1] [better source needed] A solid solution of the plagioclase feldspar oligoclase +/− the potassium feldspar orthoclase also produces moonstone specimens.
Olivine basalt collected from the rim of Hadley Rille by the crew of Apollo 15. Moon rock or lunar rock is rock originating from Earth's Moon.This includes lunar material collected during the course of human exploration of the Moon, and rock that has been ejected naturally from the Moon's surface and landed on Earth as meteorites.
The North American Cordillera extends up and down the coast of North America and roughly from the Great Plains westward to the Pacific Ocean, narrowing somewhat from north to south. It includes the Cascades , Sierra Nevada , and Basin and Range province ; the Rocky Mountains are sometimes excluded from the cordillera proper, in spite of their ...
Following are links to lists of islands of the Americas which relates to all islands associated with South America and North America, including those of the Caribbean. North America [ edit ]
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The island of Aruba formed within the past 145 million years, beginning in the Cretaceous, as part of the Lesser Antilles island arc. The island is built on a thick sequence of volcanic rock, but also has carbonate sediment deposits because it was submerged for parts of its existence.