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Orbicular Rocks in Finland
The orbicular rocks of Finland are various plutonic rocks. In this publication 29 bedrock and 61 boulder occurrences are described. Solitary boulders and boulder fans of orbicular rock are evidently derived from at least 50 separate bedrock occurences. Most of the orbicular rocks are recorded from Proterozoic bedrock (age 1.50-1.90 Ga), with relatively few discoveries from the Archaean basement areas (age 2.50-3.20 Ga). In addition, orbicular carbonatite has been encounteered in the late Devonian Sokli carbonatite intrusion (age 365 Ma).
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Explanation to the Map of Precambrian Basement of the Gulf of Finland and Surrounding Area 1 : 1 Mill
Tiivistelmä: Suomenlahden ja sen ympäristön peruskalliokartan selitys.
