An earliest Givetian ''Lilliput Effect'' at Sítio Wolff and São Bento in the Paraná Basin occurred after an extinction event, possibly related to the latest Eifelian KAČ Á K Event. The Malvinokaffric fauna was reduced from 65 genera before the extinction event to eight genera after the event. However, the abundance of the individual taxa is high. The size reduction of the surviving taxa was up to 90%. The palynomorphs during the extinction and post-extinction (''Lilliput Effect'') events are scarce. Normal palynomorph abundance and diversity is restored later in the early Givetian immediately after the post-extinction event. The relictual fauna in the beds with the ''Lilliput Effect'' at Sítio Wolff and São Bento constitute the last survivors of the classical Malvinokaffric shelly fauna in the Paraná Basin, and are at these sites mixed with immigrants and alien elements (e.g. orthoconic nautiloids). Keywords ''Lilliput Effect'' Á Earliest Givetian Á KAČ Á K Event Á Malvinokaffric fauna Á Paraná Basin Kurzfassung Im Gebiet von Sítio Wolff und São Bento des Paraná-Beckens tritt im frühesten Givetium ein ,,Liliput-ffekt'' auf, der einem Aussterbeereignis folgt, das möglicherweise Bezug zum KAČ Á K-Event des späten Eifeliums hat. Die Malvinokaffrische Fauna wurde von 65 Gattungen vor dem Aussterbeereignis auf acht Gattungen danach reduziert. Dennoch bleibt die Häufigkeit individueller Taxa hoch. Die Größenreduktion überlebender Taxa erreicht 90%. Weiterhin sind Palynomorphen während des Aussterbeereignisses und des ,,Liliput-Effekts'' selten. Normale Häufigkeit und Diversität erreichen die Palynomorphen erst später im frühen Givetium, unmittelbar nach dem Auftreten des ,,Liliput-Effekts''. Die Reliktfauna aus den Lagen mit ,,Liliput-Effekt'' im Gebiet von Sítio Wolff und São Bento beinhaltet die letzten Rudimente der klassischen Malvinokaffrischen Schalen-Fauna im Paraná-Becken. Sie vermischt sich hier mit eingewanderten Formen und exotischen Elementen (z. B. orthoconen Nautiloiden).Schlü sselwörter ,,Liliput-Effekt'' Á frühestes Givetium Á KAČ Á K-Event Á Malvinokaffrische Fauna Á Paraná-Becken
Rev. bras. paleontol. 13 (2) ABSTRACT -The Furnas/Ponta Grossa Formation contact was until recently considered gradational or abrupt and of a Lochkovian to Pragian age in the Apucarana Sub-basin (Paraná Basin, south Brazil). Based on sedimentology and palynomorph evidence a hiatus has been revealed between the Furnas Formation and the overlying Ponta Grossa Formation. The boundary between the topmost Furnas sandstones and the lowermost Ponta Grossa fine-grained sandstones constitutes a transgressive ravinement surface generated during a latest Pragian -early Emsian transgression. The hiatus corresponds to a maximum of ca. 4 Ma. A similar gap is also present in the Alto Garças Sub-basin.
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