GeologyRocks

The fourth period of the Palaeozoic. Spans 409-353Ma. The rocks of this period are referred to as Old Red Sandstone (ORS) as they are often red coloured sandstone. The name originates from the county of Devon in South West England. The colonisation of land was also well under way as shown by the famous Rynie Chert deposit.

Epochs:

• Late Devonian 371-353Ma
• Middle Devonian 380-371Ma
• Early Devonian 409-380Ma