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Greywacke zone : ウィキペディア英語版
Greywacke zone

The greywacke zone is a band of Paleozoic metamorphosed sedimentary rocks that forms an east-west band through the Austrian Alps.
The greywacke zone crops out between the Mesozoic rocks of the Northern Calcareous Alps and the Austroalpine and Penninic basement rocks of the Central Eastern Alps. Stratigraphically, the greywacke zone can be up to thick. The zone is part of the Austroalpine nappes.
Mesozoic limestones crop out north of the greywacke zone, forming the Northern Calcareous Alps. South of the zone, basement rocks of the Austroalpine and Penninic nappes form the Central Eastern Alps.
==Composition==
The lithologies of the greywacke zone are:
*Paleozoic turbidites (among them greywackes) and limestones of Ordovician to Devonian age; and
*felsic and mafic volcanic rocks of Ordovician age.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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