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The Pennsylvanian Buckhorn Asphalt Quarry contains the best-preserved Palaeozoic mollusc fauna in the world. Early impregnation of mixed siliciclastic–carbonate rocks (mudstones, pack to grainstones, shell beds, and conglomerates) with hydrocarbons prevented aragonite destruction (“Impregnation Fossil Lagerstätte”). The exceptional preservation comprises shell microstructures, microornaments and early...
Rudistid lithosomes cropping out near Castrojimeno, at the northern margin of the Central System in north-central Spain, provide detailed information on their composition and structure, on their development and succession, and about their relationship with the Coniacian sequence stratigraphy framework of the Iberian Basin. Most rudist assemblages are oligospecific, with a dominant species, or monospecific...
In the Lower Maastrichtian Cardenas Formation exposed at La Luz (State of San Luis Potosí, east-central Mexico), a shallowing-upwards mixed-clastic-carbonate sequence is exposed. The sequence passes from marls with thin siltstones, through lower and upper hippuritid-rudist-dominated intervals, and into a Durania-dominated interval. This succession shows an increase in grain size upwards and a progressive...
Coral biostromes from the Camarena Formation (External Subbetic, Betic Cordillera) are reviewed under palaeoecologic, taphonomic, and palaeontologic aspects. The biostromes are dominated by phaceloid forms and are characterized by a typical shallow-marine microencruster assemblage with photophilic microencrusters and scarce microbial crusts. The abundance of stylinid corals and light-dependant microencrusters...
The Permian bryozoan fauna of the Surmaq Formation exposed in a section near Kuh-e Hambast (Hambast Mountains, central Iran) includes ten species. Four species (Fistuliporasawatai Sakagami 1999, Fistulipora takauchiensis Sakagami 1961, Fistulipora monticulosa Nikiforova 1933, and Eridopora parasitica, Waagen and Wentzel 1886) indicate a Middle Permian (Murgabian) age of the formation. Six...
Microstructural and diagenetic patterns in acervulinid foraminifers are investigated through detailed petrographical, SEM, and geochemical analyses of Recent and fossil Acervulina and Eocene Solenomeris. The acervulinid test is composed of an optically radial hyaline magnesian calcite. The chessboard-chamber arrangement represents an efficient way for minimizing the volume accretion rate of cytoplasm,...
Bryozoans are major carbonate producers in some ancient and Recent benthic environments, including parts of the Arctic Ocean. Seventy-six species of bryozoans from within the Arctic Circle have been studied using XRD to determine their carbonate mineralogies and the Mg content of the calcite. The majority of species were found to be calcitic, only four having bimineralic skeletons that combined calcite...
The incertae sedis Carpathoporella Dragastan, 1995, reported from the Lower Cretaceous of the Western Tethyan domain, is usually interpreted as remains of calcareous algae (Dasycladales or Characeae). New thin-section material from the Aptian of Albania sheds light not only on its biogenic nature but also on the morphological variability of this taxon. In fact, Carpathoporella represents the debris...
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