Garuda - Garba Rujukan Digital

Peter Lunt

Mitra Energy Ltd, Kuala Lumpur

Author-ID : 5762530

Earth & Planetary Sciences

Published : 3 Documents Claim Missing Document

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Introduction to Cenozoic Biostratigraphy of Indonesia-SE Asia J.T. (Han) van Gorsel; Peter Lunt; Robert Morley
Berita Sedimentologi Vol 29, No 1 (2014)
Publisher : Ikatan Ahli Geologi Indonesia

An overview is presented of the current 'tools' of biostratigraphy and biofacies interpretation, as applied in the Cenozoic basins of Indonesia and Southeast Asia. We discuss previous work and historic developments of the biozonations and biofacies significance of the principal microfossil groups used in the region (foraminifera, calcareous nannofossils, palynology) and present the latest zonation charts and tables of key references. Brief reviews of work done on ostracodes, diatoms and radiolaria are also included.

A Review of the Foraminiferal Biostratigraphy of the Melinau Limestone, Sarawak Peter Lunt
Berita Sedimentologi Vol 29, No 1 (2014)
Publisher : Ikatan Ahli Geologi Indonesia

A study of the Melinau limestone, especially in the continuous Melinau Gorge section, reviews taxonomic concepts of Adams (1965) in the Heterostegina- Tansinhokella- Spiroclypeus lineage, proves the presence of Middle Eocene 'Letter Stage' Ta, at the base of the Melinau Limestone, examines the nature of the Eocene- Oligocene boundary and the absence of Wilfordia sarawakensis Adams from other Tb Eocene limestones in the region. Strontium dating and biostratigraphy calibrated to GTS04 shows there to be a significant change in sedimentary rates or preserved thickness during mid-Oligocene (latest Tc or intra-Td times), but the disconformity noted by Adams (1970) was not found, probably due to poor exposure. Observations on the termination of the Melinau limestone agree with those of Adams (1965, 1970) and Wannier (2009), with an initial event near the Oligo-Miocene boundary (Te4 to Te5 boundary) and the youngest limestones dated as Te5, about 20.3 Ma.

Stacked Digital Imaging of Foraminifera Peter Lunt
Berita Sedimentologi Vol 29, No 1 (2014)
Publisher : Ikatan Ahli Geologi Indonesia

This paper describes a technique of imaging foraminifera by combining a series of digital photographs in automated software to produce a single optical image with high resolution and superior depth of focus. Results can be obtained that are nearly as good as low-power SEM images, but have the great advantage of showing the hyaline tests as they appear to the working eye under a binocular microscope, as the foraminifera do not need to be coated in gold.Digital imaging should be utilised more in documentation of foraminifera. The benefits of a low-cost and easy method of imaging include faster learning of new faunas, leading to more consistent species concepts. Workers can now publish fully illustrated works on complex morphometric series. Commercial service companies can now illustrate important taxa / faunal components and emphasise good micropalaeontological data in a way that the written word cannot.

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Journal : Berita Sedimentologi