Formasi halang berumur Miosen Atas atau pada zonasi N.16-N.18 (Blow, 1969), tersingkap di daerah Cikidang, Kab. Majalengka Jawa Barat. Penyelidikan detail telah dilakukan terhaadap singkapan batuan sepanjang sungai Ciwaru, terutama untuk mengetahui sifat serta kerangka pengendapan sedimen tersebut.
The origin of the Banda Sea region is critical to the tectonic development of eastern Indonesia. The purpose of this study is to synthesize the existing geological and geophysical data into a tectonic model of the Banda Sea Region, as an example of a marginal basin developed within and active arc-continent collision.