Radiolaria


Book Description

Radiolaria are a very diverse marine siliceous microplankton group that have existed at least snice the Cambrian to the recent. This volume gives a representative view of research topics discussed at the 10th International Meeting of Radiolarian Palaeontologists. The articles of this volume cover mainly radiolarian biochronology and radiolarian fauna changes.







Radiolarians in the Sedimentary Record


Book Description

Radiolarians in the Sedimentary Record presents the current state of knowledge on fossil radiolarians. The author discusses the record, as well as new integrated taxonomic systems at the family level. The book provides comprehensive coverage of the fossil record of these unicellular organisms. It also discusses their important role in the history o










Jurassic Sedimentary Evolution and Nappe Emplacement in the Argolis Peninsula (Peloponnesus, Greece)


Book Description

Die mesozoisch-tertiaren Serien der Argolis-Halbinsel sind In der externen Adhami-Basalsequenz wird die Radiolarit in ein mehrphasiges Deckengebaude einbezogen, in dem sich Formation von Ophiolith fUhrenden lithischen Kalkareni zwei tertiar-tektonische {laquo}Composite Units{raquo} und die Akros ten und schliesslich von groben, mehrere 100 m machtigen Decke unterscheiden lassen. Beide {laquo}Composite Units{raquo} set Hornstein-Kalk-Breccien iiberlagert (Kandhia Breccia). Die zen sich aus einer Basalsequenz und im Spat jura darauf Komponenten stammen hauptsachlich aus der tektonisch iiberschobenen Deckeneinheiten zusammen. Die Adhami auflagernden Asklipion-Decke. Die Kandhia-Breccie er {laquo}Composite Unit{raquo} als externe und die Dhidhimi-Trapezona brachte Radiolarienfaunen des Tithonian. {laquo}Composite Unit{raquo} als interne Einheit unterscheiden sich Die Asklipion-Decke umfasst eine Tiefwasserserie, begin durch eine zeitlich und faziell verschiedene oberjurassische nend mit untertriadischen sauren Vulkaniten, gefolgt von klastische Faziesentwicklung in der Basalsequenz wie auch bis zu 1000 m machtigen Hornstein-Plattenkalken, die sich durch einen verschiedenen Gesteinsinhalt der iiberlagernden bis in den Lias fortsetzen. Diese Serie wird ebenfalls von, spat jurassischen Decken. Die Entwicklung von Plattform hier mitteI- bis oberjurassischen Radiolariten (Koliaki zu peJagischer Sedimentation erfolgte in beiden Basal Chert) und einer Ophiolith-Klasten fUhrenden, zunehmend sequenzen zunachst auf ahnliche Weise: Obertriadische bis grobkornigeren klastischen Serie iiberlagert. Die mittel-/ mittelliasische Flachwasserkalke (Pantokrator-Kalk) wer obertriadischen Asklipion-Kalke treten als verkehrt liegende den im ganzen Gebiet von pelagischen Kalken iiberlagert.










Biochronological Correlations


Book Description

The object of this book is to explain how to create a synthesis of complex biostratigraphic data, and how to extract from such a syn thesis a relative time scale based exclusively on the fossil content of sedimentary rocks. Such a time scale can be used to attribute relative ages to isolated fossil-bearing samples. From a practical point of view, the method described in this book will particularly interest paleontologists and geologists who must construct zonations and establish correlations on the basis of bio stratigraphic data that are both plentiful and apparently contra dictory. It is well known that the difficulties involved in constructing bio chronologic scales are largely due to the discontinuous nature of the fossil record. We know that the relationships between the first ap pearances (or disappearances) of different fossil species are rarely constant in stratigraphic sections that are distant from each other. It if often extremely difficult to discover datums or sets of species that are useful in making significant biochronologic correlations on a large scale. The theoretical model explained here (known as the Unitary As sociation Method) provides clear solutions to most of these problems. That method is purely deterministic, as opposed to statistical and probabilistic analytical techniques producing "average" ranges. We demonstrate in Chapter 15 why most of these techniques produce results which are usually not compatible with the original biostrati graphic observations (i.e., the taxonomic contents of the studied sam ples are not reproduced in the outputs).