New data on resedimented larger foraminifera from some Paleogene formations of the northern Apennines (Italy)

The Paleogene larger foraminifera from some flyschoid formations of the Emilian side of the northern Apennines were restudied. The presence of larger foraminifera in this area has been usually neglected, both for their rarity and for the clear redeposition of the tests out from the environment of life. Starting from the known occurrences, we restudied the Paleogene larger foraminifera from the Loiano Formation, the Montepastore Formation (formerly known as Coscogno Flysch or Coscogno Limestone), and the Monte Sporno Flysch. The larger foraminifera identified showed usually the same age in the same samples, so the assemblages are substantially contemporary. Moreover, the ages of the assemblages are consistent with the ages determined with different tools. The assemblage with Nummulites anomalus, N. beaumonti, N. incrassatus, N. problematicus, N. variolarius, Discocyclina radians radians, Orbitoclypeus varians varians, Asterocyclina stella stella, Asterocyclina stellata stellarisallow to assign a Bartonian age (SBZ 18) to the upper part of the arenaceous member of the Loiano Fm. Its lower part, with Nummulites alponensis, N. maximus, N. millecaput, N. variolarius, Operculina parva, Discocyclina radians radians, Orbitoclypeus douvillei chudeaui, Asterocyclina stella stella, Asterocyclina stellata stellarisis probably of Middle-Late Lutetian age (SBZ 15-16), even if some reworking is here probable. The assemblages collected from the Montepastore Fm. and from the Monte Sporno Flysch contain Alveolina cf. ellipsoidalis, A. moussoulensis, Glomalveolina cf. pilula, Orbitolites biplanus, Nummulites praecursor, Ranikothalia sp., Discocyclina archiaci bakhchisaraiensis.They are both attributed to the Lower-Middle Ilerdian (SBZ 6-7, basal Eocene). It is worthy noting that some authors suggested a strict correlation between these formations. The provenance of the bioclasts is still matter of speculation, given the complete absence of carbonate platform sediments in the surroundings.