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Ugi Kurnia Gusti
Universitas Sriwijaya
Earth & Planetary Sciences

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Analysis of Determination of Depositional Environment of Cinambo Formation Sandstone Member Based on Distribution of Planktonic and Benthonic Foraminifera in Sumedang Area, West Java Ahmad Thoriq Rabbani Al Ula; Edy Sutriyono; Ugi Kurnia Gusti
Jurnal Geosains West Science Vol 4 No 02 (2026): Jurnal Geosains West Science
Publisher : Westscience Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58812/jgws.v4i02.3418

Abstract

Micropaleontological analysis is an important method in determining the relative age and depositional environment of sedimentary rocks through the identification of planktonic and benthonic foraminifera as indicators of marine paleo-environments. This study aims to determine the bathymetric environment of the Cinambo Formation Sandstone Member in the Jatigede area and its surroundings, Sumedang Regency, based on the distribution of foraminifera, determine the relative age of the rocks, and interpret the depositional environment and sedimentation dynamics. The research methods include sampling at two outcrop locations, preparation using H₂O₂, multistage sieving, and microscopic identification of foraminifera. The determination of the relative age was carried out based on the Blow (1969) classification, while the interpretation of the bathymetric environment refers to Barker (1960). The results of the analysis show the presence of planktonic fossils such as Orphanage all over the world, Transitional Praeorbulina, And Globigerina praebulloides which indicates a relative age of N8 – N9 or Early Miocene to Middle Miocene, while benthonic fossils such as Fissurina wieneri, Osangularia bangalensis, and Alveolophragmium scitulumindicates an upper bathyal depositional environment. Based on these data, the Cinambo Formation Sandstone Member was deposited in a marine environment in the lower to middle fan section (lower – middle fan) through the turbidite gravity flow mechanism, reflecting transgressive conditions during the Miocene in the Jatigede area.
Interpretasi Lingkungan Pengendapan Menggunakan  Analisis Paleontologi dan Petrografi di Daerah Kedungjati dan Sekitarnya, Grobogan, Jawa Tengah Rizky Rachmadi Pratomo; Edy Sutriyono; Ugi Kurnia Gusti
Jurnal Geosains West Science Vol 4 No 02 (2026): Jurnal Geosains West Science
Publisher : Westscience Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58812/jgws.v4i02.3419

Abstract

Daerah Kedungjati di Zona Kendeng memiliki sejarah geologi kompleks yang dikontrol oleh tektonik kompresional, sedimentasi laut dalam, dan pengaruh vulkanisme. Penelitian ini bertujuan mengidentifikasi karakteristik litostratigrafi, menentukan umur dan lingkungan pengendapan, serta merekonstruksi sejarah geologi daerah penelitian dari Miosen Tengah hingga Pliosen Akhir. Metode penelitian meliputi observasi lapangan pada 101 titik pengamatan, analisis geomorfologi, pengukuran struktur geologi, penampang stratigrafi terukur, analisis petrografi sayatan tipis, dan analisis mikropaleontologi foraminifera. Hasil penelitian menunjukkan tiga satuan stratigrafi yaitu Formasi Kerek, Anggota Banyak Formasi Kalibeng, dan Formasi Kalibeng, serta struktur geologi berupa lipatan dan sesar berarah baratlaut–tenggara. Analisis petrografi mengidentifikasi calcareous subarkose, calcareous mudrock, calcareous lithic wacke, dan tuffaceous litharenite, yang mencerminkan perubahan sumber sedimen dan pengaruh vulkanisme. Analisis mikropaleontologi menunjukkan umur Miosen Tengah hingga Pliosen Akhir (N14–N20) dengan lingkungan pengendapan Batial Atas–Batial Bawah. Kehadiran sekuen Bouma dan asosiasi foraminifera mengindikasikan sistem turbidit dan submarine fan. Evolusi geologi daerah penelitian berlangsung dalam dua fase utama, yaitu pengendapan Formasi Kerek pada Miosen Tengah–Miosen Akhir, diikuti pengendapan Anggota Banyak Formasi Kalibeng dan Formasi Kalibeng pada Miosen Akhir–Pliosen Akhir.
Co-Authors Ahmad Thoriq Rabbani Al Ula Edy Sutriyono Rizky Rachmadi Pratomo