Thomas Steuber - Academia.edu (original) (raw)

Papers by Thomas Steuber

Palaeogeography, Palaeoclimatology, Palaeoecology, 2005

Seasonal temperature fluctuations of Tethyan coastal water are recorded in a pristine, 80-My-old ... more Seasonal temperature fluctuations of Tethyan coastal water are recorded in a pristine, 80-My-old rudist shell from Turkey. In order to critically assess factors other than seawater temperature that might have influenced the shell geochemical record, three different ...

Sedimentology, 2009

This study provides the first quantitative description of modern giant polygons. These large‐scal... more This study provides the first quantitative description of modern giant polygons. These large‐scale, up to 166 m diameter, sedimentological features are described here in detail from the intertidal zone of the Arabian Gulf near Abu Dhabi. These features form by the displacive carbonate cementation of carbonate sand below a 3 to 5 cm thick cover of unconsolidated sediment. The oxygen isotopic composition of cements is consistent with precipitation from evaporated sea water. Cementation proceeds via a poorly consolidated layer that grades downward into an 8 to 14 cm thick, well‐cemented grainstone. The margins of this expanding hardground form the overlapping borders of the polygons. Tepee structures at the borders of polygons are only occasionally preserved, as supporting sediment is removed by strong tidal currents and high‐energy events, such as storms, that erode the unsupported tepees. These observations have clear implications for the use of tepees in the interpretation of ancien...

Palaeogeography, Palaeoclimatology, Palaeoecology, 2003

... proposed long ago ( [Douvillé, 1891] and Toucas, 1903), and were recently discussed in more d... more ... proposed long ago ( [Douvillé, 1891] and Toucas, 1903), and were recently discussed in more detail, involving re-evaluation of the synonymy of several species ( [Vicens, 1992] , Vicens et al., 1998, Simonpietri et al., 1998, [Steuber, 1999a] and [Simonpietri and Philip, 2000] ). ...

Palaeogeography, Palaeoclimatology, Palaeoecology, 2006

Geology, 2002

... 3). Clearly, aragonite-dominated taxa (Caprinidae, Ichthyosarcolitidae) were most severely af... more ... 3). Clearly, aragonite-dominated taxa (Caprinidae, Ichthyosarcolitidae) were most severely affected by the early-late Aptian, and particularly the Cenomanian-Turonian extinctions (Masse, 1989; Philip and Airaud-Crumiere, 1991; Steuber and Löser, 2000). ...

Geological Journal, 2008

A biostratigraphic correlation of the Devonian/Carboniferous (D/C) boundary sections from the Car... more A biostratigraphic correlation of the Devonian/Carboniferous (D/C) boundary sections from the Carnic Alps, the Graz Palaeozoic, the Montagne Noire and the Pyrenees resulted in a high‐resolution record of the carbon isotopic composition of micrites (δ13Ccarb), of sedimentary organic matter (δ13Corg) and of oxygen isotope ratios of conodont apatite (δ18Ophosph). The studies focused on the interval between the Upper postera Zone (Late Famennian) and the sandbergi Zone (Lower Tournaisian). For the first time, weak but significant positive carbon isotope excursions in micrites and in the sedimentary organic matter is reported from the Middle and Upper expansa zones of the Carnic Alps. They coincide with a decrease in the oxygen isotope values of conodont apatite. The excursions indicate changes in the global carbon cycle during an episode of high seawater temperatures, and correlate with sedimentary change and a stepwise eustatic rise in the Rhenish Massif. High carbon isotope values wer...

Cretaceous Research, 2001