Pietra di Bismantova

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Pietra di Bismantova seen from Croce, in the comune of Castelnovo ne' Monti.

The Pietra di Bismantova (literally Stone of Bismantova) is a geological formation (monadnock) in the Reggiano Apennines, in the comune of Castelnovo ne' Monti, province of Reggio Emilia, Central Italy, c. 45 kilometres (28 mi) from Reggio Emilia. It has the shape of a narrow, quasi-cylindrical plateau (measuring 1 km x 240 m) whose steep walls emerge 300 metres (0.19 mi) as an isolated spur from the nearby hills. The top has an elevation of 1,047 metres (0.651 mi) above sea level. It is included in the National Park of the Appennino Tosco-Emiliano.

The spur is composed of yellowish calcarenite over a marl basement, all formed in the Miocene as a sea bottom. It includes fossils belonging to a tropical environment. It is surrounded by woods, mostly of hazel trees (Corylus avellana).

The Pietra di Bismantova is mentioned by Dante Alighieri in his Divine Comedy (Purgatory, IV, 25-30).

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Coordinates: 44°25′11″N 10°24′37″E / 44.4198°N 10.4104°E / 44.4198; 10.4104