An outline of the geology of the Northern Apennines (Italy), with Geological Map at 1:250,000 scale

It is here presented an outline of the geology of the Italian Northern Apennines, to accompany a Geological Map at 1:250,000 scale covering the Emilia-Romagna, Marche, Tuscany and Umbria regions. The map is intended as a first result of a longer term project carried out by the Geological Surveys of the above regions, aimed to create a common geological map at 1:10,000 scale, useful for environmental planning and management. The lithostratigraphic units are grouped in domains and successions (with references to main tectonic units), and a special effort was made to correlate similar lithostratigraphic units across the area. The enclosed Geological Map distinguishes stratigraphic successions deposited in: a) Ligurian Domain (Internal and External Ligurian domains); b) Subligurian Domain; c) Tuscan Domain (Tuscan Succession, Tuscan Metamorphic Succession, Cervarola-Falterona Succession, Modino Succession, Rentella Succession, Pseudoverrucano Succession); Umbria-Marche- Romagna Domain. Tectonic units derived from regional tectonic mélanges and shear zones (Sestola-Vidiciatico Unit), and units affected by HP metamorphism in the Tuscan Archipelago and southern Tuscany have been mapped. Have been distinguished younger successions as: a) Epiligurian Succession; b) Miocene- Pleistocene succession of the Tyrrhenian margin; c) Miocene-Pleistocene succession of the Po Plain and Adriatic margin. Are moreover mapped main outcrops of magmatic rocks (Miocene-Pleistocene in age) and Quaternary alluvial, continental and coastal deposits. Main tectonic contacts (high angle normal faults, main thrust and low-angle normal faults) are indicated. The 1:250,000 Geological Map of the Northern Apennines is freely available as PDF, raster and vector GIS data from the web site: https://www. geological-map.it .