TY - JOUR T1 - Dating Borneo’s Deltaic Deluge: Middle Miocene progradation of the Mahakam Delta JF - Palaios Y1 - In Press A1 - Nathan Marshall A1 - Vibor Novak A1 - Irfan Cibaj A1 - Wouter Krijgsman A1 - Willem Renema A1 - Jeremy Young A1 - Nicholas Fraser A1 - Alexander Limbong A1 - Morley, Robert J. ER - TY - JOUR T1 - Microbial carbonates in Miocene reefs in the Mahakam Delta in East Kalimantan, Indonesia JF - Sedimentary Geology Y1 - 0 A1 - Vedrana Pretković A1 - Juan C. Braga A1 - Vibor Novak A1 - Anja Rösler A1 - Willem Renema AB -

Coral patch reefs in the Miocene Mahakam Delta in East Kalimantan (Borneo, Indonesia) grew in shallow marine turbid waters. These patch reefs developed from delta front to deeper (prodelta) settings in areas with temporary reduced siliciclastic input. Langhian reef deposits are well exposed in limestone quarries in the Samarinda area and locally include microbial carbonates. Two different types of microbial carbonates have been found around Samarinda in two localities 2 km apart. These sections were logged in detail and 208 samples were collected. Meso and macrostructure of microbialites were identified at the outcrops. Thin sections from carbonate samples were examined under optical microscope and microfacies were classified using the Dunham (1962) and Insalaco (1998) terms. The carbonate content was analyzed using Total Inorganic Carbon analysis, with 12% carbon as a standard for carbon calibration. In the northern section, microbialites occur as low-relief domes, up to 2 m wide and 0.5 m high, with internal lamination, developed around large coral fragments at the transition from reef deposits to fine-grained siliciclastics.
The second type of microbialites has been found in the southern locality as decimeter-scale nodules ("megaoncoids") formed around nuclei of large coral fragments. Small nodules were bound together into bigger nodules. Microbial micrite with laminated to digitated fabrics intergrew with coralline algae to form the thick covers of these "megaoncoids", which laterally change into coral boundstones. In both sections microbialites are not components of the reef framework. They grew around large coral fragments on the flanks of the patch reefs. The microbialites that form low relief domes developed on nearly flat, stable seafloor seawards of the patch reef. The "megaoncoids" in the southern section formed as a result of downslope movement of coral fragments coated by microbialite/coralline algal crust. The steep slope at the flank of the patch reef favored falling and overturning of encrusted corals and continued growth of microbial crusts on other sides of nodules.

CY - Berlin, Germany ER - TY - JOUR T1 - Shells from seagrass meadows and coral carpets: How isotopic signals can help to distinguish palaeohabitats JF - The Malacologist Y1 - 2013 A1 - Sonja Reich A1 - Frank P. Wesselingh A1 - Viola Warter A1 - Willem Renema ER - TY - JOUR T1 - Faunal composition and isotopic signals of mollusk shells indicate seagrass meadows in the Miocene of Indonesia JF - Revista de Estudos Açoreanos, Book of Abstracts Y1 - 2013 A1 - Sonja Reich A1 - Frank P. Wesselingh A1 - Viola Warter A1 - Willem Renema SP - 169 VL - 8 ER - TY - JOUR T1 - Mollusk faunas as indirect indicators for palaeo-seagrass vegetation JF - Terra Nostra Y1 - 2012 A1 - Sonja Reich A1 - Frank P. Wesselingh A1 - Willem Renema SP - 137 EP - 138 AB -

Seagrass ecosystems play an important role in sedimentation processes and nutrient cycling and support local biodiversity by providing food and shelter for numerous associated organisms. These ecosystems have been around since the Late Cretaceous. In order to understand their emergence in geological time and their response to past perturbations we have to be able to recognize seagrass communities in the fossil record. However, seagrass itself hardly fossilizes and therefore we are searching for indirect indicators to recognize ancient seagrass vegetation. In this contribution we review molluscan evidence for palaeo-seagrass settings. Indicator species are rare since the majority of seagrass associated molluscs occurs in other marine habitats as well. Furthermore, those habitats appear to be patchy, both spatial and temporal, resulting in mixed occurrences of seagrass and non-seagrass faunas. Often only the high abundance of certain mollusc groups and the general taxonomic composition of a fauna points to seagrass environments. However, the distribution of gastropod trophic guilds in species richness versus abundance data appears to yield patterns that may be very characteristic for the identification of fossil seagrass associated faunas. We are currently applying Indirect PaleoSeagrass Indicators (IPSI’s) to a number of fossil and modern shelly samples, both from seagrass and non-seagrass environments. We also briefly review potential sedimentary and geochemical IPSI’s as well as fossil groups different than molluscs. Identifying seagrass environments enables us to assess diversity trends in such ecosystems through time and to study their response over time intervals with major environmental and climate change.

VL - 2012 IS - 3 ER - TY - JOUR T1 - A highly diverse molluscan seagrass fauna from the early Burdigalian (early Miocene) of Banyunganti (south-central Java, Indonesia) JF - Annals of the Natural History Museum in Vienna, Serial A Y1 - 2014 A1 - Sonja Reich A1 - Frank P. Wesselingh A1 - Willem Renema SP - 5 EP - 126 VL - 116 ER - TY - JOUR T1 - Indirect paleo- seagrass indicators (IPSIs): a review JF - Earth Science Reviews Y1 - Submitted A1 - Sonja Reich A1 - Emanuela Di Martino A1 - Frank P. Wesselingh A1 - Jonathan A. Todd A1 - Willem Renema ER - TY - JOUR T1 - Diversity and paleoecology of Miocene coral-associated mollusks from East Kalimantan (Indonesia) JF - Palaios Y1 - Submitted A1 - Aires Kusworo A1 - Sonja Reich A1 - Frank P. Wesselingh A1 - Nadiezhda Santodomingo A1 - Kenneth G. Johnson A1 - Jonathan A. Todd A1 - Willem Renema ER - TY - JOUR T1 - Distribution of larger foraminifera in mixed carbonate-siliciclastic systems JF - Journal of Asian Earth Sciences Y1 - 0 A1 - Vibor Novak A1 - Willem Renema ER - TY - JOUR T1 - Larger foraminifera as environmental discriminators in Miocene mixed carbonate-siliciclastic systems JF - Palaios Y1 - In Press A1 - Vibor Novak A1 - Willem Renema ER - TY - JOUR T1 - Age of Neogene fossil localities in the Northern Kutei Basin JF - Palaios Y1 - Submitted A1 - Willem Renema A1 - Viola Warter A1 - Nathan Marshall A1 - Vibor Novak ER - TY - JOUR T1 - Paleoecological significance of stable isotope ratios in Miocene tropical shallow marine habitats (Indonesia) JF - Palaios Y1 - In Press A1 - Sonja Reich A1 - Viola Warter A1 - Frank P. Wesselingh A1 - H. Zwaan A1 - Willem Renema A1 - Lucas Lourens ER - TY - JOUR T1 - Late Miocene seasonal to sub-decadal climate variability in the Indo-West Pacific (East Kalimantan, Indonesia) preserved in giant clams JF - Palaios Y1 - In Press A1 - Viola Warter A1 - Wolfgang Müller A1 - Frank P. Wesselingh A1 - Jonathon A. Todd A1 - Willem Renema ER - TY - JOUR T1 - Coralline Algae from the Miocene Mahakam Delta (East Kalimantan, SE Asia) JF - Palaios Y1 - In Press A1 - Anja Rösler A1 - Vedrana Pretković A1 - Vibor Novak A1 - Willem Renema A1 - Juan C. Braga AB -

Miocene crustose coralline algae (CCA) from the South East Asia are poorly known, although the Miocene is the epoch of the onset of the biodiversity hotspot in the region and CCA are crucial to understand the evolutionary history of reef building. To fill this knowledge gap, CCA from Lower and Middle Miocene reefs and related carbonates in the Kutai Basin in East Kalimantan (Borneo, Indonesia) have been studied. The Kutai Basin was dominated by siliciclastic sediments of the Proto-Mahakam delta and only locally carbonate buildups occur laterally to or within the deltaic succession. CCA in the Kutai Basin occur in low-energy shallow-water platform carbonates and in association with coral reefs, encrusting the corals or bioclasts. Two main CCA assemblages have been recognized: 1) A shallow-water assemblage (S-assemblage), dominated by Neogoniolithon spp., thick crusts of Spongites spp., and Hydrolithon spp.; and 2) the D-assemblage, mainly consisting of thin crusts of Lithothamnion spp., Mesophyllum spp., and Sporolithon spp., which grew in darker waters. Light reduction in reefs in the Proto-Mahakam delta was due to increased water depth or higher turbidity by higher siliciclastic input. Assemblages with intermediate composition (I-assemblages) can also be found. Common CCA with large cells fusions and groups of heterocysts, typical features of modern reef CCA, in the S-assemblages in the Middle Miocene of East Kalimantan reflect the initiation of the reef-building CCA flora in the Indo-Pacific region. The occurrence of this kind of CCA confirms the biogeographic differentiation of a tropical reef flora.

ER - TY - JOUR T1 - A diverse patch reef from turbid habitats in the Middle Miocene (East Kalimantan, Indonesia) JF - Palaios Y1 - Submitted A1 - Nadiezhda Santodomingo A1 - Vibor Novak A1 - Vedrana Pretković A1 - Nathan Marshall A1 - Anja Rösler A1 - Emanuela Di Martino A1 - Elena LoGiudice A1 - Sonja Reich A1 - Juan Carlos Braga A1 - Willem Renema A1 - Kenneth G. Johnson ER - TY - JOUR T1 - Environmental reconstruction of a late Burdigalian (Miocene) patch reef in deltaic deposits (East Kalimantan, Indonesia) JF - Palaeogeography, Palaeoclimatology, Palaeoecology Y1 - 2013 DO - http://dx.doi.org/10.1016/j.palaeo.2013.01.009 A1 - Vibor Novak A1 - Nadiezhda Santodomingo A1 - Anja Rösler A1 - Emanuela Di Martino A1 - Juan Carlos Braga A1 - Paul D Taylor A1 - Kenneth G. Johnson A1 - Willem Renema SP - 110 EP - 122 AB -

Most studies of Cenozoic shallow-water, mixed carbonate-siliciclastic depositional systems have focused on their sedimentology. To date, however, comprehensive analyses of biotas and biofacies of Indo-West Pacific reefs that developed in mixed carbonate-siliciclastic systems are lacking. This study describes the palaeoenvironment and biodiversity of a late Burdigalian patch reef that developed in a mixed carbonate-siliciclastic depositional system. The studied exposure is located at the northeast margin of the Kutai Basin near Bontang (Indonesia), and is approximately 80 m wide and 25 m thick. Multi-taxon analysis of the most abundant fossil groups, including larger benthic foraminifera, corals, coralline algae, and bryozoans, aims to provide a model for environmental interpretation that will allow comparison with similar deposits of Indo-West Pacific region. Based on fossil content and lithology, five different facies types have been distinguished: foraminiferal packstone (FP), bioclastic packstone with foralgal communities (BP), thin-platy coral sheetstone (CS), platy-tabular coral platestone (CP), and shales (S). Among larger benthic foraminifera, smaller and more robust forms dominate in the FP and BP facies, while larger and flatter forms are the most abundant in the CS and CP facies. Thin-platy corals are dominant in the CS facies and gradually change into thicker platy-tabular forms in the CP facies. Assemblages and growth forms of coralline algae show no major differences between the facies types and are dominated by melobesioids and Sporolithon. The majority of bryozoan species are encrusting and were found only in the CS facies. Light-dependent organisms occurring in the reef indicate low light conditions typical for mesophotic reefs. The relatively small size of this reef complex and quite distinct vertical changes in the facies types, combined with the high siliciclastic content in most of the units, points to strong terrigenous input affecting water transparency as the main factor controlling the reef growth.

VL - 374 ER - TY - JOUR T1 - Development of a turbid reef in the Middle Miocene (East Kalimantan, Indonesia) JF - Geological Society of America Abstracts with Programs Y1 - 2012 A1 - Nadiezhda Santodomingo A1 - Vibor Novak A1 - Nathan Marshall A1 - Emanuela Di Martino A1 - Nicholas Fraser A1 - Elena LoGiudice A1 - Vedrana Pretković A1 - Anja Rösler A1 - Willem Renema A1 - Kenneth G. Johnson SP - 623 KW - INDONESIA KW - marginal ecosystems KW - Miocene KW - palaeonvironmental reconstruction KW - patch reefs CY - Charlotte, North Carolina, USA VL - 77 UR - https://gsa.confex.com/gsa/2012AM/webprogram/Paper209284.html IS - 7 ER - TY - JOUR T1 - Interannual climate variability in the Miocene: high resolution trace element and stable isotope ratios in giant clams JF - Palaeogeography, Palaeoclimatology, Palaeoecology Y1 - 2011 A1 - Batenburg, S. J. A1 - Reichart, G.-J. A1 - Jilbert, T. A1 - Janse, M. A1 - Frank P. Wesselingh A1 - Willem Renema SP - 75 EP - 81 VL - 306 ER - TY - JOUR T1 - Hopping Hotspots: global shifts in marine biodiversity JF - Science Y1 - 2008 A1 - Willem Renema A1 - Bellwood, D. R. A1 - Juan Carlos Braga A1 - Bromfield, K. A1 - Hall, R. A1 - Kenneth G. Johnson A1 - Lunt, P. A1 - Meyer, C. P. A1 - McMonagle, L. B. A1 - Morley, R. J. A1 - O’dea, A. A1 - Jonathan A. Todd A1 - Frank P. Wesselingh A1 - Wilson, M. E. J. A1 - Pandolfi, J. M. SP - 654 EP - 657 VL - 321 ER -