By Michael Allaby
This best dictionary - now in its fourth variation - deals wide-ranging and authoritative assurance of the earth sciences and similar themes in over 7,500 transparent and obtainable entries. assurance contains geology, planetary technology, oceanography, palaeontology, mineralogy, and volcanology, in addition to climatology, geochemistry, and petrology.
This new version has been absolutely up-to-date with one hundred fifty new entries further, with improved insurance of geology and planetary geology phrases. Over one hundred thirty line drawings accompany the definitions.
The Dictionary additionally offers advised internet hyperlinks that are indexed and often up-to-date on a committed spouse site. Appendices contain a revised geological time scale, an up-to-date bibliography, stratigraphic devices, lunar and Martian time scales, wind-strength scales, and SI devices. This dictionary is vital for college students of geography, geology, and earth sciences, and for these in in similar disciplines.
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Additional resources for A Dictionary of Geology and Earth Sciences
Anacline A common condition of the interarea in a strophic brachiopod (*Brachiopoda) shell. It describes the situation where the interarea is at an angle of less than 90 to the plane of *commissure. Compare apsacline. anaerobic 1. Of an environment: one in which air (oxygen) is absent. 1 ml of dissolved oxygen per litre of water. Compare aerobic; dysaerobic. 2. e. an anaerobe. 3. Of a process: one that can occur only in the absence of oxygen. analcime (analcite) *Mineral, Na(AlSi2O6) H2O; sp. gr.
This was the condition in the earliest reptiles, the *Cotylosauria or ‘stem reptiles’. Four groups ﬂourished in the late *Palaeozoic: the *Captorhinomorpha; the *Mesosauria; the *Pareiasauridae; and the *Procolophonia, which survived into the *Triassic. The only living representatives are the turtles (Chelonia). be extracted from the partially molten rock system, or can remain within the system. Typical examples of anatexis would be the generation of granitic melts (see granite) by partially melting aluminous crustal rocks, and the generation of *basalts by partially melting *mantle *peridotite.
Analyser A piece of *Polaroid in a transmitted- or *reﬂected-light microscope which may be inserted into the light path above the *mineral section. When the analyser is out of the path of light through the microscope observations are made in *plane-polarized light (PPL); when the analyser is in the path of light, observations are made in crossed polarized light, or *crossed polars (crossed nicols, xpols, or XPL). See nicol prism. anagenesis In the original sense, refers to evolutionary advance.
A Dictionary of Geology and Earth Sciences by Michael Allaby