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The studied sediment may include Gumai Formation and Air Benakat Formation with an age ranging from Early to Middle Miocene. The Gumai Formation was deposited during the time of maximum transgression in a deep marine condition at Early Miocene (Hartanto et al., 1991). This formation consists of Globigerina bearing clay and marly shale with minor intercalation of claystone and sandstone. In the shelf environment, the deposition of Gumai Formation might continue up to Middle Miocene. In the eastern part of the Jambi Subbasin, this formation less develops which is represented by sandy lithology overlying the Talang Akar Formation locally (Sundari, 1996). On the other hand, the younger sediment of Air Benakat Formation was deposited during Middle Miocene when a regressive cycle started (Hartanto et al., 1991). It is generally characterised by a marine clay with abundant glauconite and micro-forams, claystone and an increasing number of sandstone layers toward the top formation. The Air Benakat Formation is interpreted to be formed in deep marine, which gradually changed to shallow marine.This study provides the opportunity to reveal palynological succession within the marine Early/ Middle Miocene sediment which is previously lack of information. It is also useful to interpret the vegetational condition throughout this age. This succession allows the understanding of climatic changes especially those that mark Early/ Middle Miocene boundary. Therefore, this paper is published to provide biostratigraphic information which allows explorationists to possess better understanding of the stratigraphy of the South Sumatra Basin.
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