Garuda - Garba Rujukan Digital

Article Per Year (5 Year)

p-Index From 2019 - 2024

0.751

P-Index

This Author published in this journals

All Journal Jurnal RISET Geologi dan Pertambangan Berita Sedimentologi

Yan Rizal

Department of Geology, Institut Teknologi Bandung

Author-ID : 2819489

Earth & Planetary Sciences

Published : 7 Documents Claim Missing Document

Claim Missing Document

Articles

Title

First Evidence of Miocene Avian Tracks from Sumatra: Short Announcement Yahdi Zaim; Yan Rizal; Gregg F. Gunnell; Thomas A. Stidham; Russell L. Ciochon; Aswan Aswan
Berita Sedimentologi Vol 20, No 1 (2011)
Publisher : Ikatan Ahli Geologi Indonesia

The Palaeo-Kambaniru river mouth, Sumba, East Nusa Tenggara, Indonesia: A record of strongly seasonal catastrophic flow in a monsoon-controlled deltaic complex John-Paul Zonneveld; Yahdi Zaim; Yan Rizal; Aswan Aswan; Anne Fortuin; Roy Larick; Russell L. Ciochon
Berita Sedimentologi Vol 47, No 3 (2021)
Publisher : Ikatan Ahli Geologi Indonesia

The Kambaniru River valley near the city of Waingapu preserves a thick succession of coarse-grained fluvial-deltaic sediment deposited during the Late Pleistocene. This succession incises through a thick uplifted coral reef terrace succession and records intervals of highly episodic flow events during the last glacial interval. The occurrence of intraclastic, coarse sand/gravel matrix olistostromes in several areas attests to the occasionally catastrophic nature of flow in the ancestral Kambaniru River. Small to moderate-sized coral-rich reefs and laterally restricted reef terraces occur on delta-front conglomerate successions at multiple horizons through the study interval. These reefs record both intervals of low flow as well as periodic river-mouth avulsion episodes. Comparison of radiometric dates obtained from pelecypod and coral material from both deltaic successions and laterally adjacent coral reef terrace intervals indicates that uplift/subsidence history of the terraces differs from that of the valley and that correlation between the two should be taken with care.

Sedimentary Facies of the Upper Part of Tapak Formation in Banyumas Area, Central Java Ricky Andrian Tampubolon; Yan Rizal
Berita Sedimentologi Vol 44, No 1 (2019)
Publisher : Ikatan Ahli Geologi Indonesia

The upper part of Tapak Formation in Kali Cimande of Banyumas area shows a good example of tidal flat succession. The interval consists of alternating sandstones, siltstone and mudstone that show a fining and thinning upward bedding pattern and includes sand flat, mixed flat and mud flat sedimentary facies. The sand flat facies is characterized by medium-grained sandstone, moderately sorted, with cross-lamination sedimentary structures and bioturbation trace fossils (Skolithos) found mostly on the top of sandstone layer. The mixed flat facies is characterized by an alternation of thin layered sandstones with mudstone and siltstone, with lenticular, wavy, and flaser sedimentary structures. This facies contains many forms of bioturbations, such as Planolites, Thallasinoides, Lockeia, and Ophiomorpha. The mud flat facies is characterized by repeated claystone and thin sandstone intercalation, where the ratio of clay content being more than 95 % of the total layers, and contains abundant Lockeia trace fossil. The Upper Tapak Formation in Banyumas basin has moderate reservoir potential.

Fossil-bearing Citalang Formation, Sumedang-Majalengka, West Java Yan Rizal
Berita Sedimentologi Vol 47, No 3 (2021)
Publisher : Ikatan Ahli Geologi Indonesia

The Citalang Formation in Sumedang-Majalengka area comprises of various lithological units, including coarse-grained sandstones to conglomerates, greenish grey to dark grey claystone with sandstone and tuff interbeds, and pumice-bearing tuffaceous sandstones and tuff. All these units occur in the lower part of the formation and the contacts with older, underlying rock units are unconformable in several places.Vertebrate fossil fragments are frequently found in the lowermost part of the formation, especially within the coarse-grained sandstones to conglomerates unit. This unit also holds stone tools artefacts, which were made from different kind of stones and show quite simple or primitive shape. The age of Citalang Formation is not yet resolved and still needs to be researched. Some published literatures suggest Pleistocene while there are others that suggest Pliocene.

Palaeontological surveys in Central Sumatra and Bangka Julien Louys; Yahdi Zaim; Yan Rizal; Gilbert J. Price; Aswan Aswan; Mika Rizki Puspaningrum; Holly Smith; Agus Tri Hascaryo
Berita Sedimentologi Vol 47, No 3 (2021)
Publisher : Ikatan Ahli Geologi Indonesia

We report on results from surveys undertaken in Sumatra during 2018 and 2019. The surveys had three objectives: (1) to examine, sample, and record the extensive Quaternary fossil deposits from caves in West Sumatra; (2) determine the potential for fluvial deposits in Riau and Jambi provinces; and (3) relocate the fossil proboscidean remains reported from Bangka Island. Our surveys produced several significant results. We mapped three important Padang Highland caves, Ngalau Lida Ajer, Ngalau Sampit, and Ngalau Gupin, locating and sampling the main fossil deposits in each, as well as recording additional caves in the region. Our surveys of the fluvial systems in central-west Sumatra did not reveal any vertebrate Pleistocene deposits but did yield Mio-Pliocene trace fossils. Finally, we relocated elephant fossils from Bangka, but no in situ vertebrate remains could be found. These finds add important new data to the geological history of Sumatra.

Co-Authors Affan Arif Nurfarhan Agus Tri Hascaryo Alfend Rudyawan Anne Fortuin Aswan Aswan Aswan Aswan Aswan Aswan Gilbert J. Price Gregg F. Gunnell Holly Smith John-Paul Zonneveld Julien Louys Mika Rizki Puspaningrum Ricky Adrian Tampubolon Ricky Andrian Tampubolon Roy Larick Russell L. Ciochon Russell L. Ciochon Thomas A. Stidham Wahyu Dwijo Santoso Wahyu Dwijo Santoso Yahdi Zaim Yahdi Zaim Yahdi Zaim Yahdi Zaim

Title Search

Found 5 Documents Search Journal : Berita Sedimentologi

Abstract

Abstract

Abstract

Abstract

Abstract

Title

Found 5 Documents
Search
Journal : Berita Sedimentologi