New observations on Scleractinian Corals from Indonesia: 1. free-living species belonging to the Faviina

Five free-living coral species (one new) belonging to four genera (one thus far only known fossil), and their adaptation to soft substrata are discussed

Investigations of recent and fossil coral reefs in Eastern Indonesia (Snellius II expedition): a preliminary report

Some fifty years after the Snellius I expedition (1929-1930) a Dutch-Indonesian joint expedition is carried out (1984-1985) in the Eastern Indonesian archpelago. Based on two months (September -October 1984) of research at nine different reef localities, a first report will be presented on the general morphology, composition and condition of recent and fossil reefs of these areas. The research areas that will be discussed are the following: Ambon: In the bay of Ambon fringing and patch reefs heavily damaged by silting up, caused by soi1. erosion on the island. North East Ambon an elevated reef from the old Pleistocene. Lucipara islands: Exposed very isolated atoll with some sand cays. Tukang Besi islands: Atoll reefs of Kaledupa. Binongko reef terraces; fossil cliffs modelled from massive Pleistocene reef limestone by coastal abrasion during tectonic uplift of the island; extensive reef terrace dating from the last interglacial; living reef not at the moment constructive. Sumba: East Sumba fringing reefs with influence of land and population. Young Pleistocene reef near Melolo, older terraces higher up. Komodo: Various fringing and patch reefs bordering the east side of the National Park of Komodo. Current swept reefs in the strait of Linta. Gililawa Laut and Tinandja lo~r Miocene reefs. Sumbawa: Fringing reefs in Telok Moti Toi and Sanggar bay near Tambora volcano (erupted in 1815). Coral growth in Bima bay. Pleistocene reef north east of Bima. Taka Bone Rate: Large pseudo atoll with small sand cay reefs (e.g. Tinandja) exposed reefs, coral banks and lagoons. Salayer: fringing reefs at west coast around islands Guang and Sahuluan. Pliocene reefs on both islands; Bahuluan with volcanic core. Sulawesi: Coral reef complex on the shallow shelf off South West Sulawesi, with three rows of reefs, most emerging as sand cay reefs. Because of young Holocene reg~ession in front of Ujung Pandang. Influence of sedimentation and population. Apart from these investigations during the Snellius II expedition, a long term project has been carried out since 1979 in the last area mentioned. A continuation of reef research is planned there, in close cooperation with UnHas (University of Ujung Pandang). The presentation of results will be accompanied by maps and photographs

Quaternary raised coral-reef terraces on Sumba Island, Indonesia

International audienceA spectacular sequence of coral-reef terraces (six steps broader than 500 meters and many minor substeps) is developed near Cape Laundi, Sumba Island, between an ancient patch reef 475 meters high and sea level. Several raised reefs have been dated with the electron spin resonance and the uranium-series dating methods. The uplift trend deduced from these reefs is 0.5 millimeter per year; most terraces, although polycyclic in origin, appear to correspond to specific interglacial stages, with the oldest terrace formed 1 million years ago. This puts them among the longest and most complete mid-Quaternary terrace sequences

Quaternary uplifted coral reef terraces on Alor Island, East Indonesia

International audienceA flight of six major coral reef terraces, up to 700m in altitude, occurs along the eastern and northern sides of Kabola Peninsula, Alor Island, Indonesia. Some adiometric dates have been obtained from unrecrystallizedcoral samples collected in growth position by three different methods ($^{14}$C, $^{230}$Th/$^{234}$U, ESR). This enabled the identification of the terraces corresponding to the Holocene and to oxygen-isotope stages 5c, 5e and 7. According to the present elevation of the dated terraces, a 1.0-1.2 mm/y mean rate of uplift can be discerned. Extrapolation of this trend to the whole sequence of terraces reveals a good correlation between the development of major terraces and interglacial or interstadial stages corresponding to astronomically calibrated oxygen isotope records, up to stage 13. The relatively rapid uplift rate in this region minimized the possibility of polycyclic sea-level stands at the same levels and contributed to the good preservation of some morphological reef features. Two superimposed marine notches are visible near the present shoreline, with retreat points at about 5.0 m and 8.6 m respectively above the present MLWST level. They can be interpreted as corresponding to a glacial interstadial (the upper notch) and to the Holocene sea-level peak (the lower one). As Holocene emergence has been less than what could be expected from a 1 mm/y rate of uplift, a major coseismic vertical displacement may occur in the future