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An assise (from the Fr., derived from Latin assidere, "to sit beside"), is a geological term for two or more beds or strata of rock united by the occurrence of the same characteristic species or genera.[1] In the hierarchy of stratigraphic units, an assise lies between a stage (or sub-stage) and a stratum.[2]


  1. ^ Chisholm, Hugh, ed. (1911). "Assise". Encyclopædia Britannica. 2 (11 ed.). Cambridge University Press. 
  2. ^ Miall, Andrew D. (2010). The Geology of Stratigraphic Sequences (2nd edition). Springer. p. 16. ISBN 978-3-642-05026-8.