Dieter Weyer

TL;DR: In this paper, the authors performed U-Pb isotope dilution-thermal ionization mass spectrometry (ID-TIMS) analyses on (sub)microgram-sized single zircons and zircon fragments extracted from two metabentonites (beds 79 and 70) in the lowermost Tournaisian part of the section.

Abstract: . The Devonian-Carboniferous Boundary sections at Hasselbachtal, Oese, Apricke, and Ober-Rodinghausen, all located at the northern margin of the Rhenish Mountains, were measured in detail. A semi-quantitative evaluation of the carbonate content and resulting carbonate curves permitted a highly exact correlation of these sections. This result is supported by data on ammonoid records and volcanoclastic horizons. Carbonate fluctuations within the Hangenberg Limestone are regarded as showing a 100000 years cyclicity. A new ammonoid genus Hasselbachia n. gen. and the species Paprothites ruzhencevi n. sp. are described. Among the rugose corals, a new species Hillaxon hassel n. sp., is erected. Die Devon/Karbon-Grenzprofile Hasselbachtal, Oese, Apricke und Ober-Rodinghausen, alle auf der Nordflanke des Remscheid-Altenaer Sattels gelegen, wurden detailliert aufgenommen. Die halbquantitative Ermittlung des Karbonatgehaltes und daraus resultierenden Karbonatkurven eignen sich fur eine sehr genaue Korrelation dieser Profile, die durch Funde von Ammonoideen sowie durch vulkanoklastische Horizonte unterstutzt wird. Wechsel im Karbonatgehalt werden als 100000 Jahres-Zyklizitat gedeutet. Die neue Ammonoideen-Gattung Hasselbachia n. gen. sowie die Art Paprothites ruzhencevi n. sp. werden beschrieben. Unter den rugosen Korallen wird die neue Art Hillaxon hassel n. sp. errrichtet. doi: 10.1002/mmng.20030060105

TL;DR: Exceptionally rich and well-preserved silicified exuviae comprising numerous immature growth stages allow the tracing of detailed morphological and morphogenetic features of the reduced-eyed phacopid species Cryphops ?

TL;DR: Schmidt as discussed by the authors described a small ammonoid fauna, of probable middle Early Tournaisian age, from the Gara el Kahla near Timimoun, Gourara, Algerian Sahara.

TL;DR: In this article, an integrated approach combining conodont biostratigraphy, chemostratigraphies based on carbon and oxygen isotopes, and investigations of the morphotypes of foraminifera that occur in the Buschteich section (Thuringia, Germany) was applied.