-
f Condensed Section Intervals within the Cycle II (Early Miocene) of the D35 Field, Balingian Province, Offshore Sarawak: Occurrence and Significance
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, PGCE 2008, Jan 2008, cp-258-00058
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.