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The AAPG/Datapages Combined Publications Database

Indonesian Petroleum Association

Abstract


2nd Annual Convention Proceedings, 1973
Pages 109-120

Reef–Limestones in the Sukabumi Area (S.W. Java)

Udin Adinegoro

Abstract

Reef limestones have developed during late Oligocene to early Miocene on the Sukabumi High platform, corresponding to N 3 – N 4 or late Te. During N 5 – N 7 detrital limestone lenses have been deposited in the clayey Citarum beds with some sign of life, but not able anymore to build up reefs. The reefbuilding organisms are primarily calcareous algae. Coral colonies are only locally important as reef-builders. Bryozoans are rare and include only incrusting forms of the typus Membranipora. The substratum consists of quartzsandstones, conglomeratic quartzsandstones, sandy marl and sandy clay.

Accumulation of "larger" foraminifera, mostly Lepidocyclina, is able to build up platy limestones and they also contribute as reefbuilding material.

Activities of reef destroying organisms has been observed. The best limestone outcrops have been found at Karanggantung. In the Gg. Walat area only a small streak of reef limestones are outcropping. Several reef limestone facies can be distinguished:

1) reef limestone which build up the "growing" reef.

2) detrital limestones:

     a) reef debris as inter-reef deposits and limestone banks

     b) detrital limestones with a more sedimentary character


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