Tuscany trips

However, the most widespread stone in Tuscany is without doubt what is known as "macigno," a quartzose sandstone, while in the Apuan Alps and the Garfagnana a vast karstic area gives rise to numerous caves abounding in remains of palaeontological and prehistoric times. Geothermie phenomena in the region are many and various, and thermal baths are to be found ali over the region, from the Lucchesia to the Sienese Maremma, as well as unusual phenomena such as the jets of hot air (known as "sof­fioni") in the region between the Cecina and the Cornia; discharges of gas (carbon dioxide, hydrogen sulphide), and the springs of hot water frequent in the territory of Lucca and of Siena.