anaerobic environment, Apennines, biostratigraphy, bitumens, carbonate platforms, carbonate rocks, Central Apennines, Europe, Gran Sasso d'Italia, Hettangian, Italy, Jurassic, Lower Jurassic, lower Liassic, Mesozoic, organic compounds, organic materials, paleogeography, pelagic sedimentation, sedimentary rocks, sedimentation, Southern Europe, Triassic, Upper Triassic
GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data from PASCAL, Institute de l'Information Scientifique et Technique, Vandoeuvre-les-Nancy, France
