Larger foraminifera is the term applied to those benthonic foraminifera which in general are relatively large and of which only the internal structure can be used for determination. Thus tests must be sectioned.The rapid evolution of most taxa makes larger foraminifera a valuable group for relative age determination. However, for a variety of reasons they probably are the most difficult to use for biostratigraphy :All larger foraminifera...
Wednesday, October 22, 2008
About foraminifera
Planktonic foraminifera are everywhere used as a tool for biostratigraphic purposes, but in some cases due to the unfavourable conditions they are not always present. Moreover these planktonic foraminifera are not always well preserved, oftenly indeterminable and undiagnostic. Thus another biostratigraphic tool is wise to be exposed. Many investigations indicated that the benthonic foraminifera very useful in dating the sediment...
Friday, May 23, 2008
Bandung Basin
AbstractEnvironmental problems occurring in the Bandung Basin are resulted from improper management pertaining to land and spatial planning, including landuse policy and control. Arising environmental problems are covering disturbance of watershed hydrological function, surface and groundwater quality and quantity, solid waste, and air quality. Environmental studies in the Bandung Basin have been implemented by landuse change...
Hidrotermal Taran Area
AbstractTaran area is occupied predominantly by piroclastic rocks and locally intercalations of lenticular claystones and sandstones. The pyroclastic rocks are intruded by diorite, dacite and andesite, leading alteration and mineralization within the host rocks. Mineralization occurs as a vein type and is associated with a number of pervasive alteration types named respectively: quartz-illite-montmorillonite-kaolinite ± pyrite,...
Anak Krakatau Volcano
AbstractSince its appearance in 1929, Anak Krakatau Volcano has been growing fastly. The elevation of Anak Krakatau Volcano from 1930 to 2005, within 75 years, has reached 315 m high. The growth rate is approximated to be four meters per year in average. Based on calculation, the volume of the body from the sea floor since 1927 until 1981 was 2.35 km3, and then in 1983 was 2.87 km3 and then in 1990 it reached 3.25 km3. The latest...
volcanic merapi
AbstractThe Merapi Volcanic debris flow, which is familiarly known as lahar, is formed from pyroclastic deposits that is slided by high rain water. Now, the pyroclastic deposits are produced from a collapsing lava dome. The suspension flows downhill in a high speed, to produce a turbulent flow. That flow are usually developed within areas of a different morphology having high to lower slope gradient, known as a slope fold of a...
Geology of Jakarta Basin
AbstractGeologically the Batuceper and Benda Sub-Regencies belongs to the western part of the Jakarta Basin. The area is covered by coastal alluvial and delta deposits, and volcanic product. Understanding the distribution and groundwater pattern, either in the shallow part or the deep part, are of the basic thing for a geometric model and its groundwater flow in identifying the groundwater conservation.The result of the aquifer...
Wednesday, May 14, 2008
PROCEDURE IN PALEONTOLOGICAL EXAMINATION OF SUBSURFACE SECTIONS
PROCEDURE IN PALEONTOLOGICAL EXAMINATION OF SUBSURFACE SECTIONSDepositional environments of subsurface geologic sections of interest are interpreted primarily from occurrence of species and assemblages of foraminifera. Criteria for interpretation begin with studies of Recent foraminifera obtained from plankton tows and bottom samples collected from sea floor traverses and supplemented by similar studies in the other areas. This...
ECOLOGY OF RECENT ORAMINIFERA
ECOLOGY OF RECENT ORAMINIFERAThe distribution of foraminiferal taxa is influenced by many different factors. Although many authors consider water depth the most significant one, water depth specifically is not the main variable, the controlling factor being the various physical and chemical conditions associated with depth. Typical factors are temperature and temperature variability, light availability, sedimentation rate, bottom...
APPLICATION TO ANCIENT ENVIRONMENTS
APPLICATION TO ANCIENT ENVIRONMENTSThe study of paleoenvironments is based on the concept of uniformitarianism i.e. “The present is the key to the past”.Care must be taken. Within young Tertiary rocks there is very close correspondence between fossil and recent foraminiferal assemblages. But in older sediments, of Early Tertiary to Mesozoic age, gross differences may occur as in these periods certain groups of foraminifera common...
benthic marine environment
The benthic marine environment compiled from Hedgpeth (1957) and INGLE (1980) :Non-marine (supralittoral) – top delta, alluvial plain etc.Lorenz (1863) proposed supra-littoral for the term above extreme high water (Hedgepeth, 1957). This zone include top delta, alluvial plain etc.Transitional zone (littoral) - brackish water, bay, marsh, lagoon, estuaries, deltas, beaches, tidal flats.The term littoral has been used to mean the...
Tuesday, May 13, 2008
GONDWANAN PALYNOMORPHS FROM THE PALEOGENE SEDIMENTSOF EAST JAVA: ?THE EVIDENCE OF EARLIER ARRIVALBY EKO BUDI LELONO*)*) R&D Center for Oil and Gas Technology “LEMIGAS”, JakartaABSTRACTThe palynological investigation of the Paleogene sediments is based on cutting samples collected from the exploration wells which are drilled in East Java area. The occurrence of pollen Meyeripollis naharkotensis and spore Cicatricosisporites...
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