A reappraisal of the Carboniferous macrofloras of the Zonguldak - Amasra Coal Basin, north-western Turkey
The Zonguldak – Amasra Coal Basin in north-western Turkey has Carboniferous terrestrial deposits ranging in age from Arnsbergian to late Asturian or possibly early Cantabrian. They yield macrofloras that allow detailed biostratigraphical correlations with sequences in Europe. These correlations suggest there are substantial gaps in the Zonguldak – Amasra succession, with middle to upper Namurian, upper Langsettian, Duckmantian and lower Asturian strata apparently being missing. This in turn suggests the area was subjected to significant tectonic instability during Pennsylvanian (late Carboniferous) times and that this might have been instrumental in initiating the progressive change in composition and eventual collapse of the coal swamp biome across Variscan Euramerica during Westphalian times.
Carboniferous plant fossils from northern Turkey in the Jongmans Collection, Naturalis, Leiden
The Jongmans Collection in Naturalis, Leiden, the Netherlands, is an internationally important resource of paleobotanical data that includes over 4000 Carboniferous plant fossils from northern Turkey. It was the result of two field excursions by Jongmans in Turkey during 1938 and 1946, and includes specimens collected by him, and specimens donated to him by Turkish, Swiss, and Austrian colleagues. Although not comprehensive, it is the most important source of data for the study of Carboniferous vegetation dynamics and biostratigraphy in the easternmost part of Variscan Euramerica. This in turn is vital for understanding how the progressive collapse of the Euramerican wetland biome started in the Early Moscovian, a vegetation change that coincided with the onset of a marked global climatic warming.
The guaianolides of ambrosia cumanensis HBK : The structures of cumambrins A and B☆
Abstract Cumambrins A and B isolated from Ambrosia cumanensis HBK were shown to be guaianolides with structures Ia and Ib.