By Hildegard Westphal
Periplatform slope sediments from the Bahamas function an instance for a small-scale sedimentologic list of environmental adjustments. Carbonate systems react sensitively to sea-level fluctuations. hence, sediments deposited at the slope in the course of lowstands range in composition from highstand deposits. A moment concentration is the early diagenetic alteration and cementation of those sediments with their excessive diagenetic capability. This booklet contributes to and discusses new advancements in carbonate sedimentology similar to the techniques of highstand laying off and early burial diagenesis, which even have an influence on reservoir reports.
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Extra resources for Carbonate Platform Slopes - A Record of Changing Conditions: The Pliocene of the Bahamas (Lecture Notes in Earth Sciences)
2 Quantitative Analysis of Foraminiferal Associations The abundance of benthic and planktic foraminifers within thin sections has been determined by counting the individuals present in an area of 1 to 9 cm 2 depending on the homogeneity of the thin section. Thus, statistically significant numbers were achieved that could otherwise not be obtained by point-count analysis due to the small size of most individuals (and thus their small areal percentage in the thin sections). Foraminiferal assemblages were determined in order to extract environmental information on the source area with respect to restriction and salinity, and on the facies belts productive during the time of deposition.
Rarely Globorotaliidae (Cushman, 1927) occur (Globorotalia; Cushman, 1927). Arthropoda. Thin, smooth shells of small Ostracoda are ubiquitous (Plate 4A). Mostly, ostracods are preserved as single valves or fragments, two-valved specimens are rare. Sweeping extinction under crossed Nicols results from the homogeneous prismatic wall structure. These benthic crustaceans are adapted to a wide variety of environments. Fragments of Cirripedia (barnacles) are extremely rare. Their tests are distinguished by subparallel darker lines.
The components described below have been examined in thin sections under the light microscope, and subordinately under the SEM. Palynomorphs are described from light microscope and SEM examinations. 2. Skeletal components are often considerably altered by diagenetic processes (see Chapter 5). Therefore, a typification of the biota down to species level is 32 4 Primary Signals - Sediment Input renounced. Often it could not be decided if only one or several species o f a g e n u s w e r e present.