J.T. (Han) van Gorsel
Houston, Texas, USA

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A Photographic Journey through the Cretaceous-Tertiary Stratigraphy of the Meratus Mountains-Barito Basin Margin, SE Kalimantan J.T. (Han) van Gorsel
Berita Sedimentologi Vol 34, No 1 (2016)
Publisher : Ikatan Ahli Geologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (8518.61 KB) | DOI: 10.51835/bsed.2016.34.1.107

Abstract

The SE margin of the Barito Basin shows a relatively simple succession of WNW dipping beds, brought to the surface during Late Miocene or younger uplift of the Meratus Mountain Range. Outcrops of Cretaceous - Miocene rocks can be studied east of the Trans-Kalimantan Highway East and NE of Banjarmasin, between Martapura in the south and Rantau and Kandangan in the north.A vast body of literature exists on the geology of this region. For references see the 'Bibliography of the geology of Indonesia and surrounding areas' (online at www.vangorselslist.com)The photos shown here were taken by the author in 2010, during a fieldtrip reconnaissance along the uplifted eastern margin of the Barito Basin along the SW Meratus Range. I’d like to thank Afin Sjapawi and Ellen de Man (ExxonMobil) and Agus Pujubroto and Roy Widiarta (Sugico) and others for guidance and help with logistics.
An Introduction to Paleozoic Faunas and Floras of Indonesia J.T. (Han) van Gorsel
Berita Sedimentologi Vol 31, No 1 (2014)
Publisher : Ikatan Ahli Geologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (11006.163 KB) | DOI: 10.51835/bsed.2014.31.1.122

Abstract

In the Indonesian region the most complete Paleozoic sedimentary section is in West Papua, where parts of the older Australian continental margin sequence are exposed. The oldest fossils are Ordovician-Silurian age corals and graptolites. The only Early Paleozoic fossils in West Indonesia are the enigmatic occurrence of a Devonian coral and stromatoporoid in limestone blocks in a melange section of uncertain age in NE Kalimantan. Late Paleozoic faunas and floras are more widespread across Indonesia, mainly on Sumatra, Timor and West Borneo, where the oldest fossils are of Late Carboniferous and Permian ages.Paleozoic fossils from Indonesia are mainly marine organisms, but non-marine Permian plant fossils are known from Sumatra and West Papua. Some assemblages or species signify 'low-latitude Tethyan' settings; others have 'anti-tropical/subtropical Tethyan' or 'Gondwanan' affinities, which helps constrain plate reconstruction models.
An Introduction to Mesozoic Faunas and Floras of Indonesia J.T. (Han) van Gorsel
Berita Sedimentologi Vol 31, No 1 (2014)
Publisher : Ikatan Ahli Geologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (15674.82 KB) | DOI: 10.51835/bsed.2014.31.1.123

Abstract

This paper is a continuation of the paper on Paleozoic and reviews the main Mesozoic fossil groups of Indonesia and key literature, with focus on groups that are of biostratigraphic or paleobiogeographic significance.
The Manusela Limestone in Seram: Late Triassic Age for A ‘Jurassic’ Petroleum Play Tim R. Charlton; J.T. (Han) van Gorsel
Berita Sedimentologi Vol 31, No 1 (2014)
Publisher : Ikatan Ahli Geologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (6350.542 KB) | DOI: 10.51835/bsed.2014.31.1.124

Abstract

A well-known Mesozoic hydrocarbon exploration target in eastern Indonesia is the ‘Jurassic Limestone Play’, validated by the Oseil oilfield in NE Seram. However, there is no biostratigraphic evidence to support a Jurassic age for the Manusela Limestone that forms the reservoir in this play, while numerous paleontological studies on outcrops and wells instead document only Late Triassic faunas and microfloras.We here review the paleontological literature on Seram and suggest that the Manusela Limestone is of latest Triassic (Late Norian-Rhaetian) age, while the Early-Middle Jurassic interval is condensed or absent over the structural highs established as a result of the Manusela Limestone accumulation. This revised (but in reality 100 years old) age model fits well in Tethys-wide trends where sponge- and algae-dominated reefs blossomed during the Norian-Rhaetian from the Alps to NW Australia-Papua New Guinea, while a major extinction event at the end of the Triassic caused a collapse of carbonate reef systems globally, leading to a virtual absence of reefal limestones during the Early-Middle Jurassic.