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Geologic history of the Dolomites

First part

Second part

The Fossils

Geologic history of the Dolomites - Second part

foto Later on, tectonic upheavals caused the sea-bed to drop, slowly but relentlessly (210 million years ago - Late Triassic), creating tropical shoal conditions; the clear and rough waters favoured the formation of underwater sand dunes: the deposits consisted of carbon mud and sand. The climate became damper and colonies of branchiopods appeared in the sea.

Subsequently (185 million year ago - mid Jurassic), due to the sinking of the sea bottom, the bed dropped below one thousand metres.
The very strong ocean current did not favour the creation of large deposits. This was the marine environment most suited to large shells like ammonites. The few remaining deposits, coloured red and rich in ammonites, became known as Ammonite Red.
These were later covered by friable grey rock, only in some areas unaffected by subsequent tectonic upheavals: these are the so-called "Marls of Puez". Today these appear as hills of moderate height.

Following a period of strong earthquakes and elevation, an environment was created distinguished by a very broken coastline with high cliffs overlooking the sea and a series of valleys; fast-flowing rivers carried the debris down to the sea, thereby forming the beaches.
This way, the younger Dolomite rocks were born (25 million years ago - Tertiary), the so-called "Conglomerate of Mount Parei", consisting of rounded pebbles mixed with sands, algae, shells and sharks' teeth.

First part

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