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All Journal Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Jurnal Geosains West Science
Ugi Kurnia Gusti
Universitas Sriwijaya
Agriculture, Biological Sciences & Forestry Chemistry Earth & Planetary Sciences Education Physics

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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.
Mekanisme Pembentukan Struktur Geologi Daerah Batu Ampar Dan Sekitarnya, Kabupaten Bengkulu Selatan, Provinsi Bengkulu Zaki Nurul Zaid; Edy Sutriyono; Ugi Kurnia Gusti
Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Vol. 7 No. 1 (2026): Februari
Publisher : Mataram University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/goescienceed.v7i1.1685

Abstract

This study examines the mechanisms of geological structure formation in the Batu Ampar area and its surroundings through field geological mapping and interpretation of Digital Elevation Model (DEM) imagery data. Outcrop identification was conducted to determine the types of structures in tectonically deformed rocks. The observations reveal several geological structures, including the Air Kedurang I Anticline, Air Kedurang I Syncline, Air Kedurang II Anticline, Air Kedurang II Syncline, Air Kedurang III Anticline, and the Batu Ampar Thrust Fault. Structural element analysis was carried out using Win Tensor and Dips software. The analyzed data include plane orientations (strike and dip) and pitch for fault structures, while fold analysis utilized orientation data from both fold limbs. Stereonet analysis and DEM interpretation indicate that the structural orientations and surface relief patterns predominantly trend northwest–southeast (NW–SE). The results suggest that compressional forces during the Early to Late Pliocene led to fold formation, which continued into the Pleistocene and triggered the development of the Batu Ampar Thrust Fault. Overall, the geological structures in the study area are interpreted to have formed due to sustained NW–SE–oriented tectonic activity from the Pliocene to the Pleistocene.
Karakteristik Batuan Karbonat Paleozoikum Formasi Silungkang, Cekungan Ombilin, Sumatera Barat, Indonesia Ugi Kurnia Gusti
Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Vol. 7 No. 1 (2026): Februari
Publisher : Mataram University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/goescienceed.v7i1.1690

Abstract

The Silungkang Formation, part of the Peusangan Group in the Ombilin Basin of West Sumatra, Indonesia, has long been classified as a siliciclastic unit. However, recent fieldwork and petrographic analysis from limestone outcrops near Taratak Banca Village suggest there may have been carbonate development in the area during the Paleozoic. Observations in the field show a greyish white, weathered limestone with a crystalline texture. Although there were no visible fossils were found, the carbonate rock shows signs of tropical weathering and surface dissolution. Thin section analysis reveals that the limestone is made up almost entirely of calcite (around 98%), with a small amount of opaque minerals. The calcite grains, which range from 0.3 to 1.5 mm, display strong birefringence, moderate relief, and sutured grain boundaries—signs of extensive recrystallization. Other geological features like calcite-filled microfractures and quartz veins show an influence of tectonic activity, likely related to regional orogeny processes. The absence of fossils and the highly crystallize calcite mineral suggest it has undergone considerable diagenetic alteration, that could possibly related depositional environment of a deeper marine setting followed by post-depositional changes. Despite the lack of fossil evidence, the carbonate characteristics interpreted deposited at a mid- to outer-ramp carbonate setting that was later deformed and recrystallized. These findings highlight the potential for previously unrecognized Paleozoic carbonate systems in Southeast Asia and open new possibilities for understanding the Silungkang Formation. Ongoing research could help refine its place in regional paleogeographic models and provide insight into the evolution of early Paleozoic carbonate platforms in western Indonesia.
Analisis Geomorfologi pada Daerah Kinal dan Sekitarnya, Kabupaten Kaur, Provinsi Bengkulu Ugi Kurnia Gusti; Alfaris Hadi Pramana; Edy Sutriyono
Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Vol. 7 No. 1 (2026): Februari
Publisher : Mataram University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/goescienceed.v7i1.1750

Abstract

The Kinal area and its surroundings in Kaur Regency, Bengkulu Province, are geomorphologically influenced by regional tectonic activity associated with the Bukit Barisan structural system and sedimentary formations of the Lemau Formation. These regional geological conditions control the development of structural, fluvial, karst, and denudational landforms in the study area. The purpose of this study is to analyze the geomorphological characteristics of the Kinal area based on the genetic landform classification of Van Zuidam (1985). The research method applies a geomorphological approach consisting of morphographic, morphometric, and morphogenetic analyses using DEMNas and SRTM data supported by field verification. Landform classification was conducted genetically through interpretation of slope classes, elevation, drainage patterns, lithology, and geomorphic processes. The results indicate six main geomorphic units, namely structural fault ridges, alluvial plains, channel bars, karst hills, weakly dissected denudational hills, and strongly dissected denudational hills, with elevations ranging from 150 to 450 meters above sea level. Drainage patterns are predominantly dendritic and sub-dendritic, reflecting lithological variation and structural control under intensive denudational processes. These findings demonstrate that regional tectonics and lithological resistance play a significant role in controlling geomorphic evolution and landscape development in the Kinal area.
Co-Authors Ahmad Thoriq Rabbani Al Ula Alfaris Hadi Pramana Edy Sutriyono Rizky Rachmadi Pratomo Zaki Nurul Zaid