Dictionary of Geologic Terms

Jun 30th, 2015
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Aa: A blocky and fragmented form of lava occurring in flows with fissured and angular surfaces. A-horizon: The uppermost layer of a soil, containing organic material and leached minerals. Algal mat: A layered communal growth of algae observed in fossils an in present day tidal zones associated with carbonate sedimentation.

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Dictionary of Geologic TermsA B C D E F G H I J K L M N O P Q R S T U V W X Y Z #- A -Aa: A blocky and fragmented form of lava occurring in flows with fissured and angular surfaces. A-horizon: The uppermost layer of a soil, containing organic material and leached minerals. Algal mat: A layered communal growth of algae observed in fossils an in present day tidal zones associated with carbonate sedimentation. Alkali metal: A strongly basic metal like potassium or sodium. Alluvial fan: A low, cone shaped deposit of terrestrial sediment formed where a stream undergoes an abrupt reduction of slope. Alluvium: Unconsolidated terrestrial sediment composed of sorted or unsorted sand, gravel, and clay that has been deposited by water. Angle of repose: The steepest slope angle in which particular sediment will lie without cascading down. Angstrom: A length of 10 to the minus tenth meter or one hundred millionth of a centimeter. Angular unconformity: An unconformity in which the bedding planes of the rocks above and below are not parallel. Anthracite: The most highly metamorphosed form of coal, containing 92 to 98 percent of fixed carbon. It is black, hard, and glassy. Aquifer: A permeable formation that stores and transmits groundwater in sufficient quantity to supply wells. Arkose: A variety of sandstone containing abundant feldspar and quartz, frequently in angular, poorly sorted grains. Arroyo: A steep-sided and flat-bottomed gulley in an arid region that is occup

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