Isua supracrustal belt.
Danmarks og Grønlands geologiske undersøgelse.
Copenhagen : Geological Survey of Denmark and Greenland,
1985
Issued as plate 1 in the Bulletin, no.164.
Isua, Greenland.
An area about 120 km north-east of Godthaab including the oldest known rocks in the world. The large areas of yellow on this map are of Amitsoq gneisses, about 3650 million years old, which intrude the older (about 3800 million years) Isua rocks. These, cropping out in the brightly coloured arc, were originally ordinary volcanic and sedimentary rocks though they are now strongly metamorphosed. They show that supracrustal (i.e earth-surface) processes familiar today have operated from the earliest time of which we have record.
Exhibited by Edinburgh Geological Society
Edinburgh Geological Society,