caa a22 4500 469045361 CHVBK 20180323132823.0 cr unu---uuuuu 170328e19921201xx s 000 0 eng 10.1007/BF02539797 doi (NATIONALLICENCE)springer-10.1007/BF02539797 Moussavian Esmail Institut für Paläontologie und historische Geologie, Universität München, Richard-Wagner-Str. 10, D-8000, München aut On Cretaceous bioconstructions: Composition and evolutionary trends of crust-building associations [Elektronische Daten] [Esmail Moussavian] Summary: Bioconstructions are built by colonial to solitary sessile organisms which develop a variety of different morphologies due to genetic, ecologic, and environmental controls. Crust-building associations are groups of encrusting taxa within a community which predominantly serve as binders and cementers of bioconstructions (planooccupants), while constructing organisms predominantly build the frameworks (spatio-occupants). In the Cretaceous, the most important constructional elements were corals, stromatoporoids, chaetetids, and rudists which built thickets, biostromes, mounds, patch reefs, and occasionally bioherms. The crust-building associations were composed of corals, cyanophytes (including tubiphytoids), microproblematicum (Lithocodium/Bacinella), modern red algae (corallinaceans and peyssonneliceans), as well as some stromatoporoids and chaetetids. The combination of constructing and binding associations can be used to differentiate Cretaceous build-ups both temporally and in terms of ecologic succession. The development of tropical to subtropical carbonate platforms during the Cretaceous brought about a world-wide expansion of and innovation within bioconstructions. The major changes within bioconstructions consist of the increasing dominance of the rudists as framework constructors and the evolution of the modern red algae. The corals remained an essential element of reef constructional as well as of binding associations. The stromatoporoids and chaetetids, however, lost importance during the mid-Cretaceous. Other important qualitative changes were the evolution of the acervulinids (a massive encrusting foraminiferid) during Campanian to Maastrichtian time and the extinction of the rudists at the end of the Cretaceous. Cretaceous bioconstructions suffered significant periods of retrogradation during the following periods: the beginning of the Cretaceous, Cenomanian-Turonian, and Maastrichtian-Paleocene. These represent long-term evolutionary changes, and to date, there is at least for encrusting associations no evidence to corroborate the short-term mass extinction events commonly documented for these boundaries. These long-term changes appear to be controlled by the interaction of various over-riding factors (tectonism, paleogeographic changes, oceanic chemistry, climate, and sea-level fluctuations). Although for individual bioconstructions the primary controlling mechanisim can possibly be determined, this is impossible at a global scale given current levels of understanding of the intricate interactions of these various factors. Institut für Palaentologie, Universitat Erlangen, 1992 Morphology of Crust-Builders nationallicence Associations nationallicence Bioconstructions nationallicence Evolution of Crust-Building Associations nationallicence Cretaceous nationallicence Facies Springer-Verlag 26/1(1992-12-01), 117-144 0172-9179 26:1<117 1992 26 10347 https://doi.org/10.1007/BF02539797 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02539797 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Moussavian Esmail Institut für Paläontologie und historische Geologie, Universität München, Richard-Wagner-Str. 10, D-8000, München aut NATIONALLICENCE 773 0- Facies Springer-Verlag 26/1(1992-12-01), 117-144 0172-9179 26:1<117 1992 26 10347 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer