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An informal unit even if name
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(see section 5.c. 10).
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Subbiozon, английский
(subzone). a subdivision of any kind of biozone (see section 7.c.5).
Law of superpositio, английский
(principle of superposition). the general law or principle, attributed to steno (1669), upon which all geologic chronology is based: in any sequence of layered rocks, sedimentary or extrusive volcanic, that has not been overturned, the youngest layer is at the top and the oldest is at the base. layer. a general term for any tabular body of rock—sedimentary, igneous, or metamorphic (see calkins, 1941).
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