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Abstract

A marine condensed section is a thin stratigraphic interval characterized by very slow depositional rates (<1-10 mm/yr). The interval often comprises fine-grained sedimentary rocks characterized by the presence of highly radioactive and organic rich shales, glauconite, chemical sediments and hardgrounds/firmgrounds. The interval may be thoroughly bioturbated, variably fossiliferous and locally show concretionary cement. Condensed sections reflect particularly slow accumulation rates and thereby representing a significant pan of time within only a thin layer. Condensed sections commonly develop during transgressions, in such cases they may be connected with "maximum flooding surfaces" and form important sequence stratigraphic markers.

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/content/papers/10.3997/2214-4609-pdb.258.P07
2008-01-14
2024-03-29
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