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Muhammad Kurniawan Alfadli
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m.kurniawan@unpad.ac.id
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INDONESIA
Bulletin of Scientific Contribution : Geology
ISSN : 16934873     EISSN : 2541514X     DOI : doi.org/10.24198/bsc%20geology.v18i1
BSC Geology adalah jurnal yang dikelola oleh Fakultas Teknik Geologi Universitas Padjadjaran,terbit 3 kali dalam setahun (April, Agustus, dan Desember), yang menerbitkan karya tulis ilmiah dalam bidang kebumian terutama yang berkaitan dengan geologi seperti : Petrologi Paleontologi Geomorfologi Stratigrafi Geologi Dinamik Geologi Lingkungan dan Hidrogeologi Geologi Teknik Geokimia Geofisika Sedimentologi. Setiap artikel yang akan diterbitkan adalah bersifat tanpa biaya (no processing charges dan no submission charges). Dewan redaksi dan penerbit tidak pernah meminta bayaran untuk penerbitan pada jurnal ini. Tujuan dari jurnal ini adalah untuk memperkaya pengetahuan dan informasi tentang ilmu kebumian dan dapat dimanfaatkan untuk kemaslahatan bersama.
Articles 413 Documents
GROUND PENETRATING RADAR (GPR) SURVEY ON THE LAVA FLOW IN THE SUBANG AREA, WEST JAVA PROVINCE, INDONESIA -, Hendarmawan
Bulletin of Scientific Contribution Vol 8, No 2 (2010): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (7386.215 KB) | DOI: 10.24198/bsc.v8i2.8247

Abstract

Most hydrogeologist often meet the difficulties for exploration on tle lava flow when groundwater flow within that channel not emerging or no sputed on the surface. While, in other view, depending on frequency, GPR can resolve objects down to the size of a few meters or even centimeters, and this geophysical reflection method with the highest resolving power (GPR) is also as well established tool for geophysical investigations of the shallow subsurface. Thus, it is not surprising if this approach is used at lava flow terrain, in the Subang area. The tim can directly recognized the secondary permeable zone to recommendate the icline drilling with high accurate. Therefore, in this case, the extra effort and cost involved exceed the maksimum benefits or effisien.
SIKUEN STRATIGRAFI DAN PALEOGEOGRAFI FORMASI TALANG AKAR PADA AREA “FERCANZA”, CEKUNGAN JAWA BARAT UTARA Fercanza, Frisdio; Gani, Reza Muhammad Ganjar; Abdurrokhim, Abdurrokhim; Muljana, Budi; Budiana, Rahmat
Bulletin of Scientific Contribution Vol 15, No 1 (2017): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1168.772 KB)

Abstract

ABSTRACT“FERCANZA'' area is the working area of Pertamina Hulu Energi located in North West Java Basin. This study focused on Talang Akar formation at Arjuna sub basin. This research applies the Sequence stratigraphy  concept with correlation method, which will give results in form of (1) Determination of sequences marker is more accurate, (2) Facies mapping, and (3)Sequence stratigraphy model with  higher resolution detail for determination of plays, in this case stratigraphic traps on Talang Akar Formation at "FERCANZA" area. Data used in this study include the integration of 7 well logs data, 3 side wall cores, 5 mudlog, 8 seismic line, and 1 biostratigraphy report. Sequence Boundary (SB), Maximum Flooding Surface (MFS), and other Sequence stratigraphy marker determined from well log data analysis to make a cross-correlation. Interpretation of depositional environment based on the analysis of lithofacies, elektrofacies, and seismicfacies. Based on the research results, the Formation Talang Akar on the ''FERCANZA'' area has five facies association is delta plain, delta front, pro delta, tidal channel, and shallow marine with common facies associations form of  sediment tide dominated delta and sediment shallow marine. Directions sediment supply is derived from the relative direction northwest -southeast shown by the discovery of progradation patterns to southeast of the seismic profiles were trending northwest to the southeast. Through sequences marker which have been determined, the model for deposition of Talang Akar formation is divided into 4 representation depositional models at each sequence stratigraphys marker. Representation of the model shows the conditions and morphological changes in the research areas from every phase of its.Keywords: North West Java Basin, Talang Akar Formation, Sequence stratigraphy, Depositional models ABSTRAKArea ‘’FERCANZA’’ merupakan wilayah kerja dari Pertamina Hulu Energi yang berada pada Cekungan Jawa Barat Utara. Penelitian  ini difokuskan pada Formasi Talang Akar pada sub cekungan Arjuna. Penelitian ini menerapkan konsep sequence stratigraphy dengan metode korelasi, yang akan  memberikan hasil berupa (1) Penentuan marker sikuen yang lebih akurat, (2) Pemetaan fasies, dan (3) Model sequence stratigraphydengan resolusi yang lebih detail untuk penentuan plays, dalam hal ini perangkap stratigrafi pada Formasi Talang Akar, Area “FERCANZA”. Data yang digunakan dalam penelitian meliputi integrasi dari 7 data well log, 3 side wall core, 5 data mudlog, 8 line seismik, dan 1 data biostratigrafi . Batas sikuen (SB), maximum flooding surface (MFS), dan marker sequence stratigraphylainnya ditentukan dari analisis data well log untuk membuat penampang korelasi. Interpretasi lingkungan pengendapan didasari oleh analisis lithofacies, elektrofacies, dan seismik facies. Berdasarkan hasil penelitian, pada formasi Talang Akar di Area ‘’FERCANZA’’ diketahui Formasi Talang Akar memiliki lima asosiasi fasies yaitu delta plain, delta front, pro delta, tidal channel, dan shallow marine dengan asosiasi facies umum berupa endapan tide dominated delta dan endapan shallow marine. Arah suplai sedimen berasal dari arah relatif barat laut -tenggara yang ditunjukan oleh ditemukannya pola progradasi ke arah tenggara dari profil seismik yang berarah barat laut menuju tenggara. Melalui marker sikuen yang telah ditentukan, model pengendapan untuk formasi Talang Akar dibagi menjadi 4 gambaran model pengendapan disetiap marker sequence stratigraphystratigrafi. Gambaran model tersebut menunjukkan kondisi dan perubahan morfologi daerah penelitian dari setiap fasenya.Kata Kunci : Cekungan Jawa Barat Utara, Formasi Talang Akar, Sequence Stratigraphy, Model Pengendapan
KETERDAPATAN BAHAN GALIAN GALENA DI DAERAH CIGEMBLONG, KABUPATEN LEBAK, PROPINSI BANTEN -, Mega Fatimah Rosana; -, Euis Tintin Yuningsih; -, Adi Hardiyono
Bulletin of Scientific Contribution Vol 5, No 3 (2007): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1104.821 KB) | DOI: 10.24198/bsc.v5i3.8153

Abstract

The objective of the research is to identified and investigated the occurrence of lead, its distribution, size, formation, quantity and quality in the district of Cigemblong, regency of Lebak, province of Banten as a guide for advance investigation. Several samples collected and analyzed petrographically to identified rock, alteration and ore mineral variation as well as geochemistry analysis by XRF method.The stratigraphic units of the research area can be classified into three rock units, such as from oldest to youngest one are carbonaceous claystone, tuf, andesitic – dioritic intrusive, and volcanic breccia units. Three alteration types in the research are are prophylitic, argillic, and silicification alteration.Field investigation concluded that mineralization occurred as mineralization zone of quartz veins with N – S and NE – SW direction, partially as thin lensing in claystone unit. Otherwise the distribution are limited, and separated each other. So, it is difficult to trace the vein zone and lensing as same vein.The characteristic of the mineralization zone gangue minerals dominated composed of quartz, calcite and clay mineral, with ore minerals of pyrite 
KARAKTERISTIK TANAH LEMPUNG LAPUKAN FORMASI BALIKPAPAN DI SAMBOJA, KALIMANTAN TIMUR Zakaria, Zufialdi -; Dipatunggoro, Geni -; Haryanto, Edi Tri -
Bulletin of Scientific Contribution Vol 5, No 3 (2007): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc.v5i3.8625

Abstract

Balikpapan Formation (Upper Middle Miosen) consist of quarzite sandstone, silty claystone, and shale with marl as intercalation, limestone and coal. clay at Samboja as apart of Balikpapan Formation, consist of silt, clay and sand.Clay identification based on soil mechanic is clay with high plasticity (CH), illitic, very low permeability (K = 6,61E-08 to 1,48E-07 cm/sec), medium to medium-high activity (A= 0.55 to 0.91)Keywords: clay, soil mechanic
PALEOEKOLOGI SATUAN BATULEMPUNG FORMASI JATILUHUR DAERAH CILEUNGSI , KECAMATAN CILEUNGSI, KABUPATEN BOGOR, JAWA BARAT -, Lia Jurnaliah
Bulletin of Scientific Contribution Vol 4, No 1 (2006): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2004.071 KB) | DOI: 10.24198/bsc.v4i1.8117

Abstract

Claystone is composed of clay and carbonaceous sandstone. The relatively age of claystone is Lower Miocene (N8 Zone) – Middle Miocene (N9 Zone). Based on quantitative analysis of benthic foraminifer fossils from 10 samples on Cikarang river line, there are 31 species and 480 individuals, meanwhile, from 6 samples of Cilegok river line, are found 20 species and 348 individuals. Percentages of benthic foraminifer fossils on Cikarang River are 94,8% Rotaliina, 2,71% Textulariina, 2,71% Milioliina. Cilegok river has 98,28% Rotaliina, 0% Textulariina, 1,72% Miloliina.The interpretation of Paleoecology was done by using fossil assemblages, Diversity Index α Fisher and Triangular Plot Murray. Based on those methods, paleoecology of claystone of Jatiluhur Formation of Cileungsi area was Normal Marine Lagoons. 
KONTROL STRUKTUR TERHADAP PENYEBARAN BATUAN VOLKANIK KUARTER DAN GUNUNGAPI AKTIF DI JAWA BARAT Sunardi, Edy
Bulletin of Scientific Contribution Vol 12, No 3 (2014): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (443.59 KB) | DOI: 10.24198/bsc.v12i3.8372

Abstract

Distribution of Quaternary volcanic rocks and the position of the active volcanoes are relation with subduction activity. In the surface appearance of volcanic rocks and active volcanoes is controlled by fault structure. The purpose of this study was to determine the pattern of distribution of fault structure underlying the Quaternary volcanic rocks. The methods used by Landsat imagery analysis and delineate the age distribution of volcanic rocks. Since Late Tertiary to Quaternary fault structures have been formed either as a result of reactivation of old faults or as a new fault structures formed by tectonic younger. Based on the age of volcanic rocks and underlying fault pattern can be concluded that the tectonic activity and magmatism / volcanism never stops.
PERAN KARAKTERISTIK MORFOMETRI DAERAH ALIRAN SUNGAI BUOL TERHADAP BANJIR DI WILAYAH BUKAL, TILOAN, MOMUNU DAN BIAU, PROVINSI SULAWESI TENGAH Tawil, Sukardan; Sukiyah, Emi; Rosana, Mega Fatimah; Muslim, Dicky
Bulletin of Scientific Contribution Vol 17, No 2 (2019): Bulletin of Scientific Contribution : GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (692.043 KB) | DOI: 10.24198/bsc.v17i2.23172

Abstract

ABSTRAKDaerah Aliran Sungai (DAS) Buol terletak di lengan utara Pulau Sulawesi. Bentuk DAS yang menyerupai angka 7 cenderung berbentuk paralel, menandakan ada dua sungai besar yang menyatu di wilayah hilir. Bagian hilir tampak lebar, seolah membentuk bejana besar yang dapat menyebabkan aliran S. Buol tergenang dalam jangka waktu lama. Penelitian ini dilakukan untuk mengetahui seberapa besar peran morfometri DAS terhadap fenomena banjir di wilayah tersebut. Beragam metode digunakan untuk ekstraksi data dari Citra Landsat, SRTM, peta topografi dan peta tematik yang dilakukan di studio. Deskripsi dan pengukuran obyek dilakukan di lapangan. Analisis data menggunakan pendekatan kuantitatif-deskriptif menghasilkan visualisasi dalam bentuk grafik, peta dan tabel. Analisis dilakukan terhadap 17 sub-DAS Buol. Luas sub DAS berkisar dari 2,82 sampai 335,4 km2.. Secara umum DAS Buol menunjukkan bentuk lahan pedataran dan perbukitan. Pola pengaliran di DAS Buol yakni subtrellis, subdendritik, subrektangular dan anastomotik. Morfometri berperan terhadap zona bencana geologi di dataran banjir di Timur dan Timur laut DAS Buol mencakup sebagian wilayah Kecamatan Bukal, Kecamatan Momunu dan Kecamatan Biau. Pada SDB6 bentuk DAS adalah bulu burung serta SDB7 dan SDB8 memiliki bentuk DAS radial. Nilai kerapatan pengaliran (Dd) yaitu SDB6 (1,98), SDB7 (2,44), SDBS8 (1,30), SDB6 (1,98), SDB7 (2,44) dan SDBS8 (1,30). Bila nilai Dd berkisar antara 0,25 – 10, maka alur sungai melewati batuan dengan resistensi keras sehingga sedimen yang terangkut aliran sungai relatif lebih kecil. Berdasarkan hasil rekapitulasi, debit banjir dapat diperkirakan hingga 100 tahun.Kata Kunci : DAS Buol, Morfometri, Pola Pengaliran, BanjirABSTRACTThe Buol watershed is located in the northern arm of Sulawesi Island. A watershed shape that resembles the number 7 tends to be parallel, indicating there are two major rivers that converge in the downstream region. The downstream section is wide, forming a large vessel that can cause the flow of S. Buol to be inundated for a long time. This research was conducted to find out how far the role of watershed morphometric on flood phenomena in the region. Various methods are used for data extraction from Landsat Imagery, SRTM, topographic maps and thematic maps conducted in the studio. Description and measurement of the object is done in the field. Data analysis using quantitative-descriptive approach produces visualization in the form of graph, map and table. The analysis was conducted on 17 Buol sub-watersheds. The area of the sub-watershed ranges from 2.82 to 335.4 sq.km. In general, the Buol watershed shows the shape of the plains and hills. The drainage pattern are subtrellis, subdendritic, subrectangular and the anastomotic. The morphometric relationship to the geological disaster zone in the flood plains of East and Northeast Buol watershed in some areas covers Bukal Subdistrict, Momunu Subdistrict and Biau Subdistrict. SDB6 sub-watershed forms like bird feathers, while SDB7 and SDB8 are radial. The drainage density (Dd) are SDB6 (1.98), SDB7 (2.44), SDBS8 (1.30), SDB6 (1.98), SDB7 (2.44) and SDBS8 (1.30). If the Dd value ranges from 0.25 - 10, the river channel passes through rocks with hard resistance so that the sediment transported by the river flow is relatively smaller. Based on the recapitulation results, flood discharge can be estimated up to 100 years.Key word : Buol watershed, Morphometric, Drainage pattern, Flood
KARAKTERISTIK ENDAPAN GUNUNG GEDE KAITANNYA DENGAN KETERDAPATAN AIRTANAH UNTUK KEPERLUAN MASYARAKAT DAERAH GEKBRONG KABUPATEN CIANJUR -, Undang Mardiana; -, Febriwan Mohamad
Bulletin of Scientific Contribution Vol 7, No 2 (2009): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1005.42 KB) | DOI: 10.24198/bsc.v7i2.8238

Abstract

Administratively, Gekbrong area included into Kabupaten Cianjur region; this area is frontier between Kabupaten Cianjur ( Gekbrong) with Kabupaten Sukabumi ( Cimangkok), resides in Cianjur – Sukabumi roadside. Morphologically as centered bevel of Gunung Gede (Volcano mount foot geomorphology set) with inclination bevel of between 5 - 45 % and height between 400 - 1400 meter asl. River drift pattern grows in this area is sub-parallel pattern which mains to Cibeleng river, with relative Northwest – Southeast stream direction. Geology of this area compiled by pyroclastic and laharic rock; consisted of breccia, tuff, lapilli and laharic breccia from Gunung Gede, while laying below it are compilation between Cantayan Formation Breccias component with Upper Miocene age (Mttb), Cantayan Formation Claystone component with Upper Miocene age (Mttc), Resulting Deposit Of Eldest Volcano ( Qot) Early Plistocene age and Mount Gede Lava ( Qyl) Mid Plistocene age, Breccias and lava of Mount Gede ( Qyg) Late Plistocene age (Cianjur Sheet Geological Map; Sudjatmiko, 1972).Geoelectric investigation done on the basis of physical rock properties to electric current, where each different rock will have different resistivity value. This consideration depends on some factors, such as rock age, electrolyte content, rock solidity, number of minerals contained, porosity, permeability and others. Mostly applied geophysical exploration method in subsurface hydrogeology investigation is geoelectric method (resistivity method). This sounding type also called as Vertical Electric Sounding ( VES), aimed to study various rock resistivity to vertical depth below measuring points (measuring point).Geoelectric investigation result show that there are three rock packages based on distribution and contrast of resisivity value which are interval between rugged and fine clastic and shows more laharik process after compared to its geology condition, such as :a.First package is the topmost package which is phyroclastic rock found at interval depth of 0 until - 30 meter with resistivity value of < 50 Ω m , 50 - 100 Ω m and 100 - 150 Ω m. b.Second package, being volcanic rock package found at interval depth of 0 until - 30 meter with resistivity value of < 50 Ω m, 50 - 100 Ω m and 100 - 150 Ω m. c. Third package start t at - 100 meter depth, compiled by rock with resistivity value between 40 - 50 Ω m (lapilian tuff) and 50 - 100Ω m (lapillian matrix supported breccias).
Identifikasi Airtanah Daerah Ciemas, Kabupaten Sukabumi Berdasarkan Citra Satelit, Geologi Dan Hidrogeologi Muhammad, Fathurrizal; Barkah, Mochammad Nursiyam; Hadian, Mohamad Sapari Dwi
Bulletin of Scientific Contribution Vol 14, No 3 (2016): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (859.175 KB) | DOI: 10.24198/bsc.v14i3.10966

Abstract

Air merupakan sumber kehidupan. Eksplorasi sumber daya air perlu terus dilakukan demi memenuhi kebutuhan hidup masyarakat. Daerah penelitian secara administratif terletak pada daerah Ciemas, Kabupaten Sukabumi Provinsi Jawa Barat. Keterdapatan airtanah di daerah ini masih belum banyak diketahui dan perlu dicari melalui beberapa interpretasi yang dilakukan. Untuk mengindentifikasi potensi airtanah dilakukan berdasarkan beberapa analisis diantaranya, analisis Citra satelit, Geologi dan Hidrogeologi.Dalam analisis citra satelit, di bagian Utara dan Selatan daerah Ciemas terlihat adanya perbedaan tekstur yang menunjukkan adanya perbedaan litologi batuan. Daerah penelitian memiliki tiga satuan batuan yaitu satuan batupasir kuarsa (Tebpk), satuan batupasir kuarsa (Tmbp), dan Endapan Alluvial (Qa). Selain itu terlihat pola kelurusan dan beberapa indikasi sesar yang menunjukkan 7 sesar oblique yang mengontrol daerah penelitian. Hal tersebut berpengaruh pada kondisi hidrogeologi daerah penelitian, dengan terdapat tiga jenis akuifer yang berbeda, yaitu akuifer dengan aliran melalui ruang antar butir dengan produktivitas sedang, akuifer bercelah/bersarang dengan produktivitas kecil, dan akuifer bercelah/bersarang dengan produktivitas langka. Berdasarkan hasil analisa tersebut mempengaruhi besar kecilnya potensi airtanah dan teridentifikasi berada di kawasan dataran tinggi pada akuifer produktif yang terpotong oleh patahan-patahan geologi.Kata kunci : Airtanah, Ciemas, Citra satelit
KONDISI GEOLOGI TEKNIK PASIR LEPAS TERHADAP PERENCANAAN DAN PRE-DESAIN BENDUNGAN TIPE URUGAN (EARTH DAM) DI DESA KANDANG AMPEK, KABUPATEN PARIAMAN, SUMATERA BARAT -, Boy Yoseph
Bulletin of Scientific Contribution Vol 5, No 2 (2007): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (249.936 KB) | DOI: 10.24198/bsc.v5i2.8143

Abstract

The Observatory area include in the fisiography of Rangkaian Pegunungan Barisan Barat, which is located at the elevation +604 m until +620 m above the sea level. Geologically is consist of two unit geomorphology, i.e geomorphology unit of breccia volcanic hilly extremely steep and geomorphology unit of breccia tuff hilly slope. These geomorphology condition in caused the hydraulic gradient quite high and so the speed of current surface water too. Litology of the observatory area is breccia volcanic. The geology structure of the observatory area which is holding a role is not found, but there are joints in several locations. Which were assumsed come from the tectonic activity which developed along the Sumatera Fault (Semangko Fault).Based on soil mecanic datas, the dam material has a relative session = 0 . Where as the (C) valve (cohessi) is very small, because of that the soil bearing capacity is very small, and its necessary to make a foundation. One of many years to increase Dr (relative session) from those material to mix soil (soil mixing) (to add the component cohesive /silt and clay). The Observatory area included to the earthquake area, so type of dam is earth dam. clay core on dam body is required to decrease the seepage. Dam body is consisted with the comparation of soil mix 9:1:0 and 8:1:1.

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