Geology of the Mt. Cosce sector (Narni Ridge, Central Apennines, Italy)

Abstract

This paper is companion to a 1:15,000 scale geological map of the southern sector of the Narni Range in Central Italy. This sector of the Apenninic Chain was affected by the western Tethyan rifting stage during the Early Jurassic, and the inherited architectural setting in turn influenced the Mesozoic stratigraphy and the Neogene-Quaternary tectonic evolution of the area. Based on stratigraphic and structural field evidence, a Jurassic structural high has been identified in the Mt. Cosce sector, flanked northward and westward by deeper basins. The basin that had to exist to the east, as well as the top of the horst-block, cannot be observed due to recent erosion and orogenic deformation. The western margin of the Mt. Cosce High was rejuvenated during an extensional tectonic phase which took place in the late Early Cretaceous. This synsedimentary faulting is reported in this area for the first time, and is documented by a sedimentary breccia (Mt. Cosce Breccia) resting unconformably on the Jurassic footwall-block. ARTICLE HISTORY

Geological mapping reveals the role of Early Jurassic rift architecture in the dispersal of calciturbidites: New insights from the Central and Northern Apennines

“…During the time span required for completing the infilling of rift basins, PCP tops hosted a thin, fossiliferous, resediment‐ and chert‐free succession (condensed succession of the Bugarone Group—Santantonio, 1993, 1994) (Pliensbachian to Tithonian/Berriasian—~40 million years). The complex architecture of the Early Jurassic rift was evened out in the Early Cretaceous with deposition of the Maiolica (Cipriani, Fabbi, Lathuilière, & Santantonio, 2019; Gill, Santantonio, & Lathulière, 2004), although Cipriani (2016), Cipriani and Bottini (2019a, 2019b) and Fabbi, Citton, Romano, and Cipriani (2016) report local examples of margin rejuvenation taking place later in the Early Cretaceous (Figure 2).…”

“…Centamore, Chiocchini, Deiana, Micarelli, & Pieruccini, 1971; Farinacci, Malantrucco, Mariotti, & Nicosia, 1981). The map database considered for this paper includes the Narni‐Amelia, Sabini, and Sibillini (Mt Pennino) Mountain ridges, and relies in addition on information from the area covered by Sheet 347 «Rieti» of the 1:50,000 geological map of Italy (Cipriani, 2016, 2019; Galluzzo & Santantonio, 2002; Servizio Geologico d'Italia, in press) (Figure 1). This paper is centred on a geothematic field survey, aimed at the detection and mapping of preserved palaeoescarpment tracts and of marginal basin unconformities related to the Jurassic phase of normal faulting.…”

Hybodont dentition from the Upper Jurassic of Monte Nerone Pelagic Carbonate Platform (Umbria‐Marche Apennine, Italy) and its ecological implications

“…The Monte Nerone area belongs to the UMS Domain in Central and Northern Apennines, where a well‐known Upper Triassic‐to‐Neogene stratigraphic succession is exposed (Centamore et al, ; Cipriani, ; Colacicchi, Passeri, & Pialli, ; Donatelli & Tramontana, ; Fabbi, ; Fabbi & Santantonio, ; Farinacci, ; Farinacci, Mariotti, Nicosia, Pallini, & Schiavinotto, ; Galluzzo & Santantonio, ; Pierantoni, Deiana, & Galdenzi, ). In particular, the Jurassic‐Cretaceous stratigraphy of Monte Nerone area was extensively studied in the past (e.g., Cecca et al, and references therein).…”

“…The structural highs, by contrast, remained at very low bathymetry, so that the carbonate factories remained active until the early Pliensbachian ( ibex Biozone—Morettini et al, ), when their drowning occurred simultaneously in the whole UMS Domain, possibly due to marine water environmental perturbations (Marino & Santantonio, ). From the early Pliensbachian to Early Cretaceous, the whole UMS Palaeogeographic Domain was dominated by pelagic sedimentation which slowly filled the basin up to blanket the palaeotopographic gaps, albeit with local exceptions (see Cipriani, , ; Fabbi, Citton, Romano, & Cipriani, ). The structural lows were filled by some hundred metres‐thick successions, whereas on the structural highs the same time span was covered by some tens to some metres‐thick condensed successions, in settings commonly known as “Pelagic Carbonate Platforms” (Catalano, Channel, D'Argenio, & Napoleone, ; Santantonio, , ; see also Flügel, for a brief critical revision of the nomenclature of condensed pelagic carbonates).…”

Multiphase morphospace saturation in cyrtocrinid crinoids

“…; Marino & Santantonio ; Fabbi & Santantonio ; Fabbi ; Fabbi et al . ; Cipriani ; Cipriani et al . ; Paparella et al .…”