First record of Rhabdoceras suessi (Ammonoidea, Late Triassic) from the Transylvanian Triassic Series of the Eastern Carpathians (Romania) and a review of its biochronology, paleobiogeography and paleoecology

Abstract The occurrence of the heteromorphic ammonoid Rhabdoceras suessi Hauer, 1860, is recorded for the first time in the Upper Triassic limestone of the Timon-Ciungi olistolith in the Rarău Syncline, Eastern Carpathians. A single specimen of Rhabdoceras suessi co-occurs with Monotis (Monotis) salinaria that constrains its occurrence here to the Upper Norian (Sevatian 1). It is the only known heteromorphic ammonoid in the Upper Triassic of the Romanian Carpathians. Rhabdoceras suessi is a cosmopolitan species widely recorded in low and mid-paleolatitude faunas. It ranges from the Late Norian to the Rhaetian and is suitable for high-resolution worldwide correlations only when it co-occurs with shorter-ranging choristoceratids, monotid bivalves, or the hydrozoan Heterastridium. Formerly considered as the index fossil for the Upper Norian (Sevatian) Suessi Zone, by the latest 1970s this species lost its key biochronologic status among Late Triassic ammonoids, and it generated a controversy in the 1980s concerning the status of the Rhaetian stage. New stratigraphic data from North America and Europe in the subsequent decades resulted in a revised ammonoid biostratigraphy for the uppermost Triassic, the Rhaetian being reinstalled as the topmost stage in the current standard timescale of the Triassic. The geographic distribution of Rhabdoceras is compiled from published worldwide records, and its paleobiogeography and paleoecology are discussed

Representative geosites of the Roztocze Hills

Praca prezentuje przegląd wiedzy na temat budowy i historii geologicznej Roztocza. Koncentruje się przede wszystkim na utworach mioceńskich. Litologia, struktury sedymentacyjne i mikrofacje tych utworów wskazują na wysokoenergetyczne, płytkomorskie środowisko sedymentacji, związane ze strefą brzegową. Przebieg sedymentacji w badenie wykazywał na tym obszarze silny związek z ewolucją zapadliska przedkarpackiego. Najbardziej interesujące i reprezentatywne dla utworów mioceńskich geostanowiska to: Brusno, Huta Różaniecka, Nowiny, Józefów, Żelebsko i Łysaków. W tych geostanowiskach możliwe jest prowadzenie obserwacji różnych typów skał, struktur sedymentacyjnych i biogenicznych. W związku z tym dla uczniów, studentów i innych stanowią one doskonałe punkty do nauki geologii obszaru Roztocza

The Triassic of Timor: Lithostratigraphy, chronostratigraphy and palaeogeography

The palaeontologically rich and lithologically diverse Triassic successions of Timor provide a key stratigraphic and palaeontological link between northwestern Australia and other terranes of former eastern Gondwana (present-day Southeast Asia). Timor i