单词	chronostratigraphy
释义	chronostratigraphy /ˌkrɒnə(ʊ)strəˈtɪɡrəfi / noun [mass noun] The branch of geology concerned with establishing the absolute ages of strata.This unique succession of ammonoid assemblages allows unequivocal recognition of European substage-level chronostratigraphy across the mid-Carboniferous boundary interval in North America for the first time.... Stratigraphy, then, was originally concerned with rocks, that is, lithostratigraphy; it soon afterwards included the ranges of fossils throughout the successions, biostratigraphy; and the more abstract chronostratigraphy. A tentative correlation with a Tethyan reference carbon-isotope curve allows the provisional application of stage-level chronostratigraphy to the Wealden Group. Derivatives chronostratigraphic /ˌkrɒnə(ʊ)stratɪˈɡrafɪk/ adjective ... The division of the Phanerozoic into chronostratigraphic divisions - eras, periods, epochs and ages - has itself evolved over a period of about 200 years. Marine tephra layers form important chronostratigraphic markers and may also provide information on eruption dynamics and chronology. Spectral gamma-ray logs provide additional data on lithological composition that can aid identification of chronostratigraphic surfaces in a high-resolution sequence stratigraphic correlation framework.
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