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Middle Devonian reef‑derived calciturbidites of western Ossa‑Morena Zone (Portugal): conodont biostratigraphy of the Eifelian Pedreira da Engenharia Limestone Silvério, Gonçalo Liao Chen, Jau-Chyn Valenzuela-Ríos, José Ignacio Machado, Gil Barreto, Pedro Moreira, Noel 56:551.734(469) Eifelian Conodonts Calciturbidites Pedreira da Engenharia limestone Cabrela Basin Ossa-Morena Zone Paleontología 2416.02 Paleontología de Los Invertebrados The first biostratigraphical study on the complete Pedreira da Engenharia quarry section (Middle Devonian, SW Portugal) is presented. A total of 32 samples were collected from the three subsections (PE-A, quarry floor; PE-B and PE-C). This led to the identification of 15 species belonging to the genera Icriodus, Polygnathus and Tortodus. Four index species were identified: P. costatus; T. australis; T. kockelianus; and P. ensensis. The age for the Pedreira da Engenharia section was updated from the costatus zone (Boogaard, 1972) to the costatus-ensensis zones (lower to uppermost Eifelian). There is a thin part of the succession representing the kockelianus and, possibly, eiflius zones, together being represented by 1,5 m. A CAI value of 5-5.5 for the conodont elements indicates a maximum temperature of over 300 ºC. The Pedreira da Engenharia Limestone, together with the Odivelas Limestone, are evidence of the development of calciturbidite sedimentation associated with atoll-like structures (only preserved in Odivelas) along the SW boundary of Ossa-Morena Zone, being probably associated with the beginning of the subduction of the Rheic Ocean during Early to Middle Devonian times. Fundação para a Ciência e a Tecnologia (Portugal) Depto. de Geodinámica, Estratigrafía y Paleontología Fac. de Ciencias Geológicas TRUE pub 2024-07-09T18:14:57Z 2024-07-09T18:14:57Z 2024 journal article https://hdl.handle.net/20.500.14352/105882 1698-6180 10.1007/s41513-024-00242-0 1886-7995 eng UIDB/04683/2020 MICCIN-MIU, CAS22/00148 UIDP/04683/2020 MIU Next Generation EU, ZA21-005 UIDB/04683/2020 ALT20-03-0145-FEER-000028 2020.08450.BD UNESCO-IGCP 652 PALPALPAL (GIUV2017-395) PERIGONDWANA (UCM 910231) Attribution 4.0 International http://creativecommons.org/licenses/by/4.0/ open access application/pdf Springer