Английская Википедия:Geology of Åland
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The geology of Åland includes Jotnian age sediments from the Proterozoic, such as sandstone, siltstone, arkose, conglomerate and shale. The islands are underlain by plutonic rocks common of the Svecofennian Domain.[1][2]
References
Шаблон:Åland-stub Шаблон:Regional-geology-stub