Abstract
Newly discovered outcrops in the Sotres area (Picos de Europa, Asturias, Spain) lie unconformable on marine carbonates of the Picos de Europa Formation (Myachkovian) and beneath lagoonal algal limestones of Autunian age (perhaps equivalent to the upper Stephanian ), and have been named Pirué Beds. The Pirué Beds are made up of bedded bioclastic and chert-bearing limestones of marine character. Fusulinacean faunas present in these rocks point to an upper Myachkovian age and can be correlated with similar clastic unconformable deposits more to the north, in the Gamonedo area. All these rocks lie in the northern part of the Picos de Europa domain, and represent basin border deposits related to fault activity, while the partially age-equivalent succession at Las Llacerias to the south is composed of more distal limestones. These rocks are considered as synorogenic deposits marking the beginning of late Carboniferous tectonic disturbances in the Picos de Europa domain.
