Upper Silurian and Lower Devonian conodonts from Tafilalt, southeastern Morocco

The conodont association from three Silurian-Lower Devonian sections (Bou Tchrafine N2, Atrous 3 and Atrous 7) in the Tafilalt (southeast Morocco) are presented. The sections are constituted by cephalopod rich limestones ("Orthoceras limestones") and by crinoidal limestones ("Scyphocrinites limestones") cropping out within thick shaley sequences. The association includes 29 taxa belonging to 13 genera (Ancyrodelloides, Belodella, Dvorakia, Icriodus, Kockelella, Lanea, Oulodus, Ozarkodina, Pelekysgnathus, Polygnathoides, Pseudooneotodus, Wurmiella, Zieglerodina). The conodont fauna allows the recognition of seven conodont zones: ploeckensis and siluricus in the Ludlow, eosteinhornensis s.l., Lower detortus and Upper detortus in the Pridoli, and hesperius and transitans in the Lochkovian. The age of the "Orthoceras limestones" is confirmed as middle Ludfordian (ploeckensis-siluricus zones), whereas it is stated that the "Scyphocrinites limestones" spans the Silurian/Devonian boundary. Some elements of the apparatus of Zieglerodina planilingua and the P2 element of Lanea omus are described. The phylogenetic relationships between genera Lanea and Ancyrodelloides are discussed

Conodont and crinoid stratigraphy of the upper Silurian and Lower Devonian scyphocrinoid beds of Tafilalt, southeastern Morocco

Three sections (Atrous 3, Atrous 7 and Bou Tchra\ufb01ne N2) in the \u201cScyphocrinites Limestones\u201d of Ta\ufb01lalt (southeastern Morocco) have been investigated for conodont and crinoid stratigraphy. Conodonts allow to discriminate four biozones (Ozarkodina eosteinhornensis s.l., Lower Oulodus elegans detortus, Upper O. elegans detortus, and Icriodus hesperius) of Pridoli and the lowermost Lochkovian. Cirrus loboliths occur only in the Pridoli, whereas plate loboliths are present in the uppermost Silurian and the basal Devonian; the two types overlap in the uppermost Silurian. As for calices, Scyphocrinites and Carolicrinus occur in the whole Pridoli; Camarocrinus and Marhoumacrinus are present across the Silurian\u2013Devonian boundary and in basal Devonian beds

Conodont and crinoid stratigraphy of the upper Silurian and Lower Devonian scyphocrinoid beds of Tafilalt, southeastern Morocco

Three sections (Atrous 3, Atrous 7 and Bou Tchrafine N2) in the “Scyphocrinites Limestones” of Tafilalt (southeastern Morocco) have been investigated for conodont and crinoid stratigraphy. Conodonts allow to discriminate four biozones (Ozarkodina eosteinhornensis s.l., Lower Oulodus elegans detortus, Upper O. elegans detortus, and Icriodus hesperius) of Pridoli and the lowermost Lochkovian. Cirrus loboliths occur only in the Pridoli, whereas plate loboliths are present in the uppermost Silurian and the basal Devonian; the two types overlap in the uppermost Silurian. As for calices, Scyphocrinites and Carolicrinus occur in the whole Pridoli; Camarocrinus and Marhoumacrinus are present across the Silurian–Devonian boundary and in basal Devonian beds

Lochkovian (Lower Devonian) conodonts from the Rio Malinfier section (Carnic Alps, Italy)

Conodont data from the Rio Malinfier section, located in the Cason di Lanza area (Carnic Alps, Italy) are presented. Twelve taxa belonging to eight genera (Ancyrodelloides, Dvorakia, Icriodus, Lanea, Oulodus, Ozarkodina, Pseudooneotodus and Zieglerodina) allow to state a middle Lochkovian (Lower Devonian) age for the section. The lithological boundary between the N\uf6lbling and the La Valute formations is dated to the transitans Zone