@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} } @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 {2054, title = {Early Miocene larger foraminifera assemblage of the Taballar Limestone (East Kalimantan)}, journal = {Journal of Foraminiferal Research}, author = {Vibor Novak} } @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} } @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 {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} } @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} }