cyclothem

A series of beds, of interest because they include coal, which were associated with unstable shelf or interior basin conditions in which alternating marine transgressions and regressions occurred.
Found on https://www.encyclo.co.uk/local/22327

cyclothem

complex, repetitive stratigraphic succession of marine and nonmarine strata that are indicative of cyclic depositional regimes. Ideal cyclothem ... [3 related articles]
Found on http://www.britannica.com/eb/a-z/c/174
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