02403nas a2200133   4500008004100000245009300041210006900134260003000203520183900233100001702072700002802089700001902117856013302136       2012                        eng d00aLarger benthic foraminifera – faunal pioneers in mixed carbonate-siliciclastic systems0 aLarger benthic foraminifera faunal pioneers in mixed carbonatesi  aCharlotte, NCc04/11/20123 aLarger benthic foraminifera are one of the most abundant and widespread organisms in shallow marine tropical
environments. Their role as rapid colonizers of new substrates has been suggested, but little is still known to support
this idea. To address this question, larger benthic foraminifera assemblages have been studied in the
paleoenvironmental reconstruction of a Langhian (Middle Miocene) shallow-water patch reef, as part of a broader multitaxon
fossil comunity analysis, including corals, coralline algae, and bryozoans. The studied outcrop (approx. 80 m
wide and 25 m thick) is located at the northeast margin of the Kutai Basin near Bontang (Indonesia).
The patch-reef was developed in mixed carbonate-siliciclastic depositional environment and despite the high
terrigenous input affecting water transparency, this reef contains a diverse marine biota. Five different facies types were
distinguished based on lithology and fossil content: foraminifera packstone, bioclastic packstone with foralgal
communities, thin-platy coral sheetstone, platy-tabular coral platestone, and shales. Excluding the fossil barren shales
facies, only larger benthic foraminifera occur in all four remaining facies types, showing the ability to rapidly adapt to
changes in environment. In the current study, high siliciclastic input caused fluctuations in light levels, but also resulted
in deposition of soft-bottom substrate. In newly developed conditions, the larger benthic foraminifera appear first and
mark the initiation of reef growth.
The persistence of LBF throughout the fossil reef succession indicates their high tolerance to terrigenous input and also
highlight the role of foraminifera as primary colonizers, proving themselves as important faunal pioneers, particularly in
mixed carbonate-siliciclastic systems.1 aNovak, Vibor1 aSantodomingo, Nadiezhda1 aRenema, Willem  uhttps://ipaeg.myspecies.info/content/larger-benthic-foraminifera-%E2%80%93-faunal-pioneers-mixed-carbonate-siliciclastic-systems03029nas a2200133   4500008004100000245009200041210006900133260002300202520247700225100001702702700001902719700002902738856012802767       2012                        eng d00aBurdigalian turbid water patch reef environment revealed by larger benthic foraminifera0 aBurdigalian turbid water patch reef environment revealed by larg  aViennac22/04/20123 aAncient isolated patch reefs outcropping from siliciclastic sediments are a trademark for the Miocene carbonate
deposits occurring in East Kalimantan, Indonesia. They develop in transitional shelf sediments deposited between
deltaic and deep marine deposits (Allen and Chambers, 1998). The Batu Putih Limestone (Wilson, 2005) and similar
outcrops in adjacent areas have been characterized as shallow water carbonates influenced by high siliciclastic
input, showing low relief patch reefs in turbid waters. Larger benthic foraminifera (LBF) are excellent markers
for biochronology and paleoenvironmental reconstruction. This study aims to reveal age and paleoenvironment
of a shallow water carbonate patch reef developed in mixed depositional system by using LBF and microfacies
analysis.
The studied section is located near Bontang, East Kalimantan, and is approximately 80 m long and 12 m high.
It is placed within Miocene sediments in the central part of the Kutai Basin. Patch reef and capping sediments
were logged through eight transects along section and divided into nine different lithological units from which
samples were collected. Thin sections and isolated specimens of larger benthic foraminifera were analyzed and
recognized to species level (where possible) providing age and environmental information. Microfacies analysis
of thin sections included carbonate classification (textural scheme of Dunham, 1962) and assemblage composition
of LBF, algae and corals relative abundance. Three environmentally indicative groups of LBF were separated
based on test morphology, habitat or living relatives (Hallock and Glenn, 1986).
Analysed foraminifera assemblage suggests Burdigalian age (Tf1). With use of microfacies analysis nine
successive lithological units were grouped into five facies types. Paleoenvironmental reconstruction of LBF fossil
assemblage indicate two cycles of possible deepening recorded in the section. Based on high muddy matrix
ratio in analyzed thin-sections we still cannot conclude whether they were deeper water assemblage, or that they
occurred in shallower water and influenced by turbid conditions as the result of terrigenous input. According to
preliminary analysis and siliciclastic content in the sediments the later one should be more likely. Further work
will include additional fossil groups analysis (corals, algae and bryozoans), detailed petrographical analysis and
Strontium isotope stratigraphy.1 aNovak, Vibor1 aRenema, Willem1 aProject, the, Throughflo  uhttps://ipaeg.myspecies.info/content/burdigalian-turbid-water-patch-reef-environment-revealed-larger-benthic-foraminifera-000682nas a2200181   4500008004100000245008700041210006900128260001500197100001700212700002800229700001800257700002500275700002000300700002000320700002500340700001900365856011600384       2012                        eng d00aEnvironmental reconstruction of a Langhian patch reef (East Kalimantan, Indonesia)0 aEnvironmental reconstruction of a Langhian patch reef East Kalim  c29/03/20121 aNovak, Vibor1 aSantodomingo, Nadiezhda1 aRösler, Anja1 aDi Martino, Emanuela1 aBraga, Juan, C.1 aTaylor, Paul, D1 aJohnson, Kenneth, G.1 aRenema, Willem  uhttps://ipaeg.myspecies.info/content/environmental-reconstruction-langhian-patch-reef-east-kalimantan-indonesia00416nas a2200097   4500008004100000245007100041210006900112260001500181100001700196856010500213       2011                        eng d00aForaminifera assemblages of East Kalimantan through time and space0 aForaminifera assemblages of East Kalimantan through time and spa  c09/12/20111 aNovak, Vibor  uhttps://ipaeg.myspecies.info/content/foraminifera-assemblages-east-kalimantan-through-time-and-space