New sedimentological and palynological data from the Permian and Triassic series of the Sancerre-Couy core, Paris Basin, France

Abstract

A new description and sampling campaign of the Sancerre-Couy core has been achieved to reconstruct the evolution of the depositional environments of the Permian and Triassic series and the palynological evolution of the Permian to Lower Jurassic series. High-resolution sequence stratigraphy of the Permian and Triassic series of the Paris Basin, based on well-log A c c e p t e d M a n u s c r i p t analysis, is used to determine seven progradational-retrogradational cycles in the Permian and twelve cycles in the Triassic. Out of the 54 samples collected from the Sancerre-Couy-1 core, only 23 were palynologically productive. Based on the taxonomic composition, four palynological assemblages are distinguished, three of which have been described in previous studies. These three classical palynological assemblages of the Sancerre-Couy-1 core are documented in detail for the first time in this present study. The description of the new assemblage and its correlation can be used to reassess the previously assigned ages: assemblage SC-1 is late Ladinian in age, SC-2 is of the Ladinian-Carnian transition, SC-3 is early Carnian in age, and SC-4 is of late Rhaetian age whereas it had previously been assigned a Hettangian age.

State of the art of Triassic palynostratigraphical knowledge of the Cantabrian Mountains (N Spain)

“…The presence of Kraeuselisporites reissingeri is reported together with Carnisporites spiniger, Classopollis meyeriana, Convolutispora klukiforma, Ovalipollis pseudoalatus, Taurocusporites verrucatus and the dinoflagellates Dapcodinium priscum and Rhaetogonyalax rhaetica in the SC-4 assemblage (late Raethian age) described by Juncal et al [2018] in the Sancerre-Couy core (Paris Basin). The presence of Kraeuselisporites reissingeri and Tsugapollenites pseudomassulae is also described in the lower Malanotte Fm of the Triassic-Jurassic transition in the western Southern Alps (Northern Italy; Galli et al [2007]) in an assemblage that contains Classopollis torosus, Cerebropollenites macroverrucosus and the dinoflagellate cysts Dapcodinium priscum.…”

“…The Carmona assemblage ( Figure S1, Supplementary data) from the lower part of the Cicera Fm is Longobardian in age (late Ladinian), due to the presence of Camerosporites secatus, Chordasporites singulichorda, Duplicisporites granulatus, Illinites chitonoides, Lunatisporites noviaulensis, Microcachryidites doubingeri, Ovalipollis pseudoalatus, Triadispora falcata, Triadispora staplinii, and Triadispora suspecta. This composition is equivalent to the "second assemblage" in Adloff et al [1987], the SC-1 assemblage from Sancerre-Couy core, Paris Basin [Juncal et al, 2018] and the palynological associations described from the Mâconnais Region in France [Adloff and Doubinger, 1979], in Jura, France [Adloff et al, 1984], the Largentière area, Ardèche, France [Doubinger and Adloff, 1977], the Monte San Giorgio, Southern Alps, Switzerland [Scheuring, 1978]. These assemblages correspond to the Camerosporites secatus-Enzonalasporites vigens phase [Van Der Eem, 1983], the Heliosaccus Table 1.…”

“…The San Pedro and Cicera assemblages ( Figures S2 and S3, Supplementary data) The taxonomic composition of the San Pedro and Cicera assemblages is equivalent to that of the SC-2 assemblage, described by Juncal et al [2018], of the Sancerre-Couy core (Paris Basin), obtained from levels associated with anhydrite sabkha deposits with black silty clays. These levels correspond to the Ladinian-lower Carnian cycle, which is the lateral equivalent of the Lettenkhole Fm in the eastern part of the Paris Basin [Bourquin et al, 2002].…”

New palynological data in Muschelkalk facies of the Catalan Coastal Ranges (NE of the Iberian Peninsula)

“…The palynological assemblages studied in the Upper Muschelkalk of the Catalan Coastal Ranges are comparable with other assemblages recognised in the middle-upper part of Royuela Formation in Torrecilla and Arroyo de San Roman (Guadalajara, Spain;Ramos 1979), the Upper Muschelkalk of Alcalá de la Selva and Barranco del Contador, Cañete Formation (Teruel, Spain; Arche et al 1995), the Upper Muschelkalk of Pantano de la Tranquera (Zaragoza, Spain. García-Royo et al 1989), and the assemblage SC-2 of Juncal et al [2018] in the Paris Basin.…”

Report on ICDP Deep Dust workshops: probing continental climate of the late Paleozoic icehouse–greenhouse transition and beyond

“…In the Paris Basin, numerous late Paleozoic "sub-basins" have been recognized since the 1960s but lie beneath the Ceno-Mesozoic cover. The southwestern Paris Basin in particular remains virtually unexplored with no core except for a 110 m core of Permian red beds (Juncal et al, 2018) and three wells reaching a maximum of 1600 m in the upper Carboniferous to upper Permian section (Bertray, Brécy, and Saint-Georges-sur-Moulon) with available well-log data (gamma ray, sonic) and cutting descriptions. Recent pre-stack migration processing reprocessing of vintage seismic data reveals a significant Permian section here (Fig.…”