@article {2075, title = {Dating Borneo{\textquoteright}s Deltaic Deluge: Middle Miocene progradation of the Mahakam Delta}, journal = {Palaios}, year = {In Press}, author = {Nathan Marshall and Vibor Novak and Irfan Cibaj and Wouter Krijgsman and Willem Renema and Jeremy Young and Nicholas Fraser and Alexander Limbong and Morley, Robert J.} } @article {2017, title = {Microbial carbonates in Miocene reefs in the Mahakam Delta in East Kalimantan, Indonesia}, journal = {Sedimentary Geology}, address = {Berlin, Germany}, abstract = {

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.

}, author = {Vedrana Pretkovi{\'c} and Juan C. Braga and Vibor Novak and Anja R{\"o}sler and Willem Renema} } @conference {2017, title = {Microbial carbonates in Miocene reefs in the Mahakam Delta in East Kalimantan, Borneo, Indonesia}, booktitle = {SAGE2013 - Southeast Asian Gateway Evolution}, year = {2013}, month = {11/03/2013}, address = {Berlin, Germany}, abstract = {

Microbial carbonates are deposits that form by the activity of bentic microbial communities. Microbialites usually form domical, columnar or conical structures and can have laminated, clotted, dendritic or homogenous macrofabric. They have a broad distribution and can grow in a variety of different environments such as hot springs, freshwater lakes, hypersaline lakes, reefs and other marine environments. This research focuses on microbialites associated to coral reefs. 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 Embry and Klovan (1971) 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 a 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 favoured falling and overturning of encrusted corals and continued growth of microbial crusts on other sides of nodules.

}, author = {Vedrana Pretkovi{\'c} and Juan C. Braga and Vibor Novak and Anja R{\"o}sler and Willem Renema} } @conference {2066, title = {Thirty years of field-based {\textquoteright}Big Paleontology{\textquoteright} on Cenozoic shallow marine ecosystems}, booktitle = {10th North American Paleontological Convention}, year = {2014}, publisher = {The Paleontological Society Special Paper, 22}, organization = {The Paleontological Society Special Paper, 22}, address = { Gainesville, Florida}, author = {Kenneth G. Johnson and James Klaus and Jonathan A. Todd and Willem Renema and Ann F. Budd} } @conference {2066, title = {Oligocene and Miocene history of reef corals and coral reefs in eastern Borneo (East Kalimantan, Indonesia and Sabah, Malaysia)}, booktitle = {10th North American Paleontological Convention}, year = {2014}, publisher = {The Paleontological Society Special Paper, 22}, organization = {The Paleontological Society Special Paper, 22}, address = { Gainesville, Florida}, author = {Kenneth G. Johnson and Willem Renema and Nadiezhda Santodomingo} } @proceedings {2062, title = {Identifying Neogene seagrass habitats as a cornerstone to study ecological responses to environmental change }, year = {2014}, type = {Presentation at the Molluscan Forum, London, UK}, address = {Gainsville, Florida}, author = {Sonja Reich and Frank P. Wesselingh and Viola Warter and Willem Renema} } @article {2062, title = {Shells from seagrass meadows and coral carpets: How isotopic signals can help to distinguish palaeohabitats }, journal = {The Malacologist}, year = {2013}, type = {Presentation at the Molluscan Forum, London, UK}, author = {Sonja Reich and Frank P. Wesselingh and Viola Warter and Willem Renema} } @article {2062, title = {Faunal composition and isotopic signals of mollusk shells indicate seagrass meadows in the Miocene of Indonesia}, journal = {Revista de Estudos A{\c c}oreanos, Book of Abstracts}, volume = {8}, year = {2013}, pages = {169}, type = {Poster at the World Congress of Malacology, Ponta Delgada, Azores.}, author = {Sonja Reich and Frank P. Wesselingh and Viola Warter and Willem Renema} } @article {2013, title = {Mollusk faunas as indirect indicators for palaeo-seagrass vegetation}, journal = {Terra Nostra }, volume = {2012}, year = {2012}, pages = {137-138}, type = {Oral Presentation at the Annual Meeting of the Paleontological Society, Berlin, Germany}, abstract = {

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.

}, author = {Sonja Reich and Frank P. Wesselingh and Willem Renema} } @article {2057, title = {A highly diverse molluscan seagrass fauna from the early Burdigalian (early Miocene) of Banyunganti (south-central Java, Indonesia)}, journal = {Annals of the Natural History Museum in Vienna, Serial A}, volume = {116}, year = {2014}, pages = {5-126}, author = {Sonja Reich and Frank P. Wesselingh and Willem Renema} } @article {2057, title = {Indirect paleo- seagrass indicators (IPSIs): a review}, journal = {Earth Science Reviews}, year = {Submitted}, author = {Sonja Reich and Emanuela Di Martino and Frank P. Wesselingh and Jonathan A. Todd and Willem Renema} } @article {2056, title = {Diversity and paleoecology of Miocene coral-associated mollusks from East Kalimantan (Indonesia)}, journal = {Palaios}, year = {Submitted}, author = {Aires Kusworo and Sonja Reich and Frank P. Wesselingh and Nadiezhda Santodomingo and Kenneth G. Johnson and Jonathan A. Todd and Willem Renema} } @article {2054, title = {Distribution of larger foraminifera in mixed carbonate-siliciclastic systems}, journal = {Journal of Asian Earth Sciences}, author = {Vibor Novak and Willem Renema} } @article {2053, title = {Larger foraminifera as environmental discriminators in Miocene mixed carbonate-siliciclastic systems}, journal = {Palaios}, year = {In Press}, author = {Vibor Novak and Willem Renema} } @conference {2045, title = {Sub - annually resolved Miocene/Pliocene tropical palaeo - climate records from giant clams}, booktitle = {11th INTERNATIONAL CONFERENCE ON PALEOCEANOGRAPHY}, year = {2013}, publisher = {Sitges}, organization = {Sitges}, address = {Barcelona}, abstract = {

Changes in seasonality play an important role in regards to climate changes (e.g. Eldrett
et al.,
2009). To better characterize Miocene/Pliocene tropical climate and environmental change, it is
therefore crucial to reconstruct their variability on a seasonal scale. However, highly time resolve
d
palaeoenvironmental records which allow assessing
tropical intra
-
annual SST variability (like
ENSO or monsoon events) are rare, especially in \&$\#$39;deep
-
time\&$\#$39;.
Here, we present high resolution
trace element and stable isotope proxy records from well
-
preserved aragonitic Late Miocene and
Pliocene
Tridacna
spp.
shells, sampled along the coast of East Kalimantan (Indonesia) and Sabah
(Malaysia), respectively. Our multi
-
proxy approach utilizes LA
-
ICPMS El/Ca ratios (e.g. Mg/Ca,
Sr/Ca, Ba/Ca) and micromilled stable isotope profiles (

18
O,

13
C).
Records obtained fr
om our
Miocene specimens show a remarkable agreement in Mg/Ca, Sr/Ca and

18
O and can be aligned
with the shell banding pattern.

18
O intra
-
annual variability indicates a palaeoseasonality of 3
-
4\°C
(if interpreted as being temperature
-
controlled only). Ba/
Ca profiles from Pliocene tridacnin shells
are characterized by pronounced, episodically occurring peaks with a high intrashell
reproducibility. Very similar Ba/Ca signals found in modern
Tridacnagigas
have been interpreted
as palaeoproductivity indicators
(Elliot et al., 2009). Records of a modern
Tridacna
spp. from
Sabah are utilized for comparison and calibration purposes
.

}, url = {http://www.icp2013.cat/USB/PDF/P-183.PDF}, author = {Viola Warter and Wolfgang M{\"u}ller and Willem Renema} } @article {2044, title = {Age of Neogene fossil localities in the Northern Kutei Basin}, journal = {Palaios}, year = {Submitted}, author = {Willem Renema and Viola Warter and Nathan Marshall and Vibor Novak} } @article {2043, title = {Paleoecological significance of stable isotope ratios in Miocene tropical shallow marine habitats (Indonesia)}, journal = {Palaios}, year = {In Press}, author = {Sonja Reich and Viola Warter and Frank P. Wesselingh and H. Zwaan and Willem Renema and Lucas Lourens} } @article {2042, title = {Late Miocene seasonal to sub-decadal climate variability in the Indo-West Pacific (East Kalimantan, Indonesia) preserved in giant clams}, journal = {Palaios }, year = {In Press}, author = {Viola Warter and Wolfgang M{\"u}ller and Frank P. Wesselingh and Jonathon A. Todd and Willem Renema} } @article {2040, title = {Coralline Algae from the Miocene Mahakam Delta (East Kalimantan, SE Asia)}, journal = {Palaios}, year = {In Press}, abstract = {

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.

}, author = {Anja R{\"o}sler and Vedrana Pretkovi{\'c} and Vibor Novak and Willem Renema and Juan C. Braga} } @conference {2015, title = {Diversity and palaeoecology of Miocene coral-associated molluscs from East Kalimantan}, booktitle = {SAGE2013: Southeast Asian Gateway Evolution}, year = {2013}, address = {Museum fuer Naturkunde, Berlin}, abstract = {

Currently, SE Asia is the global marine centre of diversity. High diversity is concentrated in and around reefs. A large variety of organisms, including corals and fish, but also molluscs, crustaceans and echinoderms contribute to this high diversity. In order to understand the timing and the context of the origin of the modern biodiversity hotspot, the fossil record needs to be documented. However, reef facies often suffer strong diagenesis, compromising the fossil record of reef and reef-associated organisms. Here we present an assessment of a well-preserved Late Miocene mollusc fauna from Bontang (East Kalimantan, Indonesia). The fauna is found in association with branching corals, dominated by Dictyaraea. The mollusc fauna is dominated by predatory and browsing carnivorous snails and includes reefal indicators such as the gastropod Coralliophyla and the bivalve Tridacna. The new Bontang fauna gives a glimpse of the diversity and ecological composition of a Late Miocene mollusc fauna from a so-called coral-carpet environment.

}, author = {Aires Kusworo and Sonja Reich and Frank P. Wesselingh and Nadiezhda Santodomingo and Willem Renema} } @conference {2014, title = {Mollusks as seagrass indicators in the Miocene of Indonesia}, booktitle = {SAGE 2013: Southeast Asian Gateway Evolution}, year = {2013}, address = {Museum fuer Naturkunde, Berlin}, abstract = {

Today\’s centre of maximum marine biodiversity is located in the Indo-Malayan region. Understanding the development of this biodiversity hotspot through the Cenozoic could answer numerous questions about the responses of highly diverse faunal associations to small and large scale environmental changes. When assessing marine biodiversity through time comparisons of taxon diversity are only meaningful when comparing faunas from similar habitats. To evaluate diversity through time within the same ecological setting, it is indispensable to reliably discriminate different habitats. A good example for the difficulties which may occur when identifying marine paleo-habitats is the challenge of recognizing seagrass vegetation in the fossil record. Due to the low preservation potential of marine angiosperms, indirect indicators, e.g. associated organisms with a higher potential for preservation, are commonly used to infer the presence of seagrass meadows in the geological past. Because of their high fossilization potential and their abundance in marine habitats mollusks yield the possibility to be useful paleo seagrass indicators. Here we assess the potential use of indicator species, species and feeding guild composition of whole assemblages, as well as stable isotope signals in shells for their suitability to determine seagrass vegetation in the Miocene of Indonesia.

}, author = {Sonja Reich and Frank P. Wesselingh and Willem Renema and Warter, Viola} } @conference {2006, title = {Foraminiferal assemblages in Miocene carbonates of Indonesia}, booktitle = {Southeast Asian Gateway Evolution: SAGE2013}, year = {2013}, month = {11/03/2013}, address = {Museum fuer Naturkunde, Berlin}, abstract = {Neogene carbonates in Indonesia are characterised by different depositional environments. We studied localities outcropping on Mangkalihat Peninsula, Kutai Basin, and Java, that were deposited in a time interval from Early (Te5) to Middle Miocene (Tf2). In order to reconstruct depositional environments and obtain biostratigraphic information, larger benthic foraminifera (LBF) assemblages were analysed from these three locations. The northernmost, and stratigraphically oldest, from the studied carbonates are exposed on Mangkalihat Peninsula. They were formed in shallow-water environment on carbonate platform. Stratigraphically important LBF indicate Early to Middle Miocene age (Te5-Tf1). Towards the south, in the Kutai Basin, isolated patch reefs occur within siliciclastic sediments, developed in mixed carbonate-siliciclastic depositional systems. In general, LBF assemblage is indicative of low-light conditions typical for mesophotic reefs. Based on LBF late Early to Middle Miocene age (Tf1-Tf2) can be suggested. The southernmost carbonate exposures are located on Central Java, in the Bulu Limestone member. The LBF assemblage composition indicate environmental conditions typical for continental shelf edge. Middle Miocene (Tf2) can be inferred for these limestones based on LBF. Here we present an overview of Indonesian Early to Middle Miocene LBF assemblages in a range of depositional environments. We will assess the interplay between stratigraphical and environmental control on LBF assemblages. }, author = {Vibor Novak and Willem Renema} } @article {1990, title = {Development of a turbid reef in the Middle Miocene (East Kalimantan, Indonesia)}, journal = {Geological Society of America Abstracts with Programs}, volume = {77}, year = {2012}, pages = {623}, address = {Charlotte, North Carolina, USA}, keywords = {INDONESIA, marginal ecosystems, Miocene, palaeonvironmental reconstruction, patch reefs}, url = {https://gsa.confex.com/gsa/2012AM/webprogram/Paper209284.html}, author = {Nadiezhda Santodomingo and Vibor Novak and Nathan Marshall and Emanuela Di Martino and Nicholas Fraser and Elena LoGiudice and Vedrana Pretkovi{\'c} and Anja R{\"o}sler and Willem Renema and Kenneth G. Johnson} } @conference {1963, title = {Late Cenozoic history of the Southeast Asian marine biodiversity maximum: new data for old questions}, booktitle = {Palaeontological Association Annual Meeting}, year = {2011}, month = {19/12/2011}, address = {Plymouth}, author = {Kenneth G. Johnson and Willem Renema} } @article {1626, title = {Hopping Hotspots: global shifts in marine biodiversity}, journal = {Science}, volume = {321}, year = {2008}, pages = {654-657}, author = {Willem Renema and Bellwood, D. R. and Juan Carlos Braga and Bromfield, K. and Hall, R. and Kenneth G. Johnson and Lunt, P. and Meyer, C. P. and McMonagle, L. B. and Morley, R. J. and O{\textquoteright}dea, A. and Jonathan A. Todd and Frank P. Wesselingh and Wilson, M. E. J. and Pandolfi, J. M.} }