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van Gorsel, J.T. (Han)
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Earth & Planetary Sciences

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Middle Jurassic Ammonites from The Cendrawasih Bay Coast and North Lengguru Fold-Belt, West PApua: Implications of a ‘Forgotten’ 1913 Paper van Gorsel, J.T. (Han)
Berita Sedimentologi Vol 23, No 1 (2012)
Publisher : Ikatan Ahli Geologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1328.411 KB) | DOI: 10.51835/bsed.2012.23.1.191

Abstract

Occurrences of Middle Jurassic bathyal shales with typical ammonite faunas were reported from the 'Birds Neck', West Papua, in 1913 and 1927 publications but these appear to be largely forgotten. They signify an eastern limit for the gas-productive Middle Jurassic sands of Bintuni Bay and thus have significant negative implications for the potential of Mesozoic hydrocarbon plays in Cenderawasih Bay.
Short Communication: No Jurassic Sediments on Sumba Island? van Gorsel, J.T. (Han)
Berita Sedimentologi Vol 25, No 1 (2012)
Publisher : Ikatan Ahli Geologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (478.535 KB) | DOI: 10.51835/bsed.2012.25.1.173

Abstract

Roggeveen (1929) described a small ammonite fragment from SW Sumba Island, provisionally identified as a Middle Jurassic species. It is associated with Inoceramus-type bivalves. The presence of Jurassic age sediments within the intensely deformed Mesozoic section of Sumba was accepted by some authors and this presence of Jurassic ammonites and bivalves was used to support the presence of Australian continental basement crust on Sumba and South Sulawesi.However, subsequent workers on the geology of Sumba have been unable to find additional fossil evidence for the presence of Jurassic sediments on Sumba; the oldest rocks that could be reliably dated are of Late Cretaceous age.Three ammonite specialists were consulted to check the identification of the ammonite illustrated from Sumba by Roggeveen (1929). They concluded that the fragment could not be reliably identified and could well be a Cretaceous species, and also suggested that the associated Inoceramus looked like Cretaceous species. There is therefore no reliable evidence for the presence of any rocks older than Late Cretaceous on Sumba, and it remains to be demonstrated whether basement of Sumba contains any Australia-derived continental material.
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