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All Journal Journal of Earth and Marine Technology (JEMT)
Dianda Rahma Aulia
Geological Engineering Study Program, Faculty of Engineering, Sriwijaya University
Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Energy Physics Transportation

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Depositional Environment of the Rajamandala Formation Based on Foraminiferal Analysis from the Kemang Area, Cianjur Regency, Bogor Basin, West Java, Indonesia Dianda Rahma Aulia; Budhi Setiawan; Sundus Ghaida Noor Azizah
Journal of Earth and Marine Technology (JEMT) Vol 6, No 2 (2026)
Publisher : Lembaga Penelititan dan Pengabdian kepada Masyarakat - Institut Teknologi Adhi Tama Suraba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jemt.2026.v6i2.9193

Abstract

The Rajamandala Calcareous Sandstone Member (Omc) and the Rajamandala Limestone Member (Oml) represent mixed siliciclastic–carbonate and carbonate deposits within the Bogor Basin. This study aims to determine the depositional environments and to evaluate the stratigraphic relationship between these two units by integrating geological mapping and micropaleontological analysis. Biostratigraphic analysis based on planktonic foraminifera indicates that both the Calcareous sandstone unit of the Rajamandala Calcareous Sandstone Member (Omc) and the Rajamandala Limestone Member (Oml) were deposited during the Early Miocene (Zones N7–N8). Benthic foraminiferal assemblages indicate deposition within an inner–middle neritic environment for both units. Field observations document a direct contact between the two lithologies, while geological mapping shows calcareous sandstone becoming increasingly abundant toward the southwest and limestone becoming progressively dominant toward the northeast. The equivalent ages, similar depositional environments, and observed field relationships are consistent with the interpretation that the two units were deposited contemporaneously and exhibit lateral facies variation within the same shallow marine depositional system.
Co-Authors Budhi Setiawan Sundus Ghaida Noor Azizah