RT Journal Article
T1 Cefalópodos del Ordovícico Medio de la Formación Valongo, norte de Portugal
T1 Middle Ordovician cephalopods from the Valongo Formation, northern Portugal
A1 Sá, Artur A.
A1 Gutiérrez Marco, Juan Carlos
AB Ordovician cephalopods from the Valongo Formation are among the first Ordovician fossils describedfrom the Iberian Peninsula. The present review shows a lower taxonomical diversity than previously reported.Large endocerids and orthocerids are abundant in beds of early Oretanian (Middle Darriwilian) age, andorthocerids and some tarphycerids occur in strata of early Dobrotivian (Late Darriwilian) age. Despite thepoor preservation in shales and the absence of internal structures, five different forms of longicones wereidentified, remaining them in open nomenclature. Tarphycerids are better recognizable and belong to thelate Darriwilian forms Trocholites fugax and T. cf. depressus, with the former species recorded over a widearea of Ibero-Armorica and Bohemia, and the second related to a Baltic form. The occurrence of the genusTrocholites among Circumpolar Gondwana cephalopod faunas is consistent with the sporadic transfer ofwarm to temperate water masses southwards from the vicinity of Baltica, through a period of climaticdisturbances affecting the southern hemisphere during the late Darriwilian
YR 2009
FD 2009
LK http://hdl.handle.net/10272/7959
UL http://hdl.handle.net/10272/7959
LA spa
DS Repositorio Institucional de la Universidad de Huelva
RD 13 jun 2026