horizon basal

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• Stone Age — the period in the history of humankind, preceding the Bronze Age and the Iron Age, and marked by the use of stone implements and weapons: subdivided into the Paleolithic, Mesolithic, and Neolithic periods. [1860 65] * * * First known period of… …   Universalium

• Insect wing — Original veins and wing posture of a dragonfly. Hoverflies hovering to mate …   Wikipedia

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• pre-Columbian civilizations — Introduction       the aboriginal American Indian (Mesoamerican Indian) cultures that evolved in Meso America (part of Mexico and Central America) and the Andean region (western South America) prior to Spanish exploration and conquest in the 16th …   Universalium

• Kambalda type komatiitic nickel ore deposits — Kambalda type nickel ore deposits are a class of magmatic nickel copper ore deposit in which the physical processes of komatiite volcanology serve to enrich, concentrate and deposit nickel bearing sulfide within the lava flow environment of an… …   Wikipedia

• Rodrigues Starling — Conservation status Extinct (IUCN 3.1) Scientific classification Kingdom …   Wikipedia

• Décollement — Fig. 1 Imbricate fan in a thrust system with a basal décollement[1][2] Décollement (dé collé ment) is a gliding plane between two rock masses. In French, décoller means to detach from or to rip of …   Wikipedia

• Olympus Mons — This article is about the volcano on Mars. For other uses, see Olympus (disambiguation). Olympus Mons Wide view of the Olympus Mons aureole, escarpment and caldera Coordinates …   Wikipedia

• Dinosaurs of the Morrison Formation — Further information: Morrison Formation The Morrison Formation is a distinctive sequence of Late Jurassic sedimentary rock that is found in the western United States, which has been the most fertile source of dinosaur fossils in North America. It …   Wikipedia

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• Silurian Period — Interval of geologic time, 443–417 million years ago. The third period of the Paleozoic Era, the Silurian follows the Ordovician Period and precedes the Devonian. It marks the first appearance of land plants and jawed fishes. The continents were… …   Universalium