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They interpreted these dates to represent an Ordovician regional metamorphic event.
In contrast, the Ordovician magmatic event postdates the pre-Variscan deformation in the external zone.
These are overlain by low-grade metamorphosed sediments and volcanics of Ordovician and Silurian age.
Because of the disparate nature of the Ordovician and Cambrian records, it is difficult to make direct comparison between the two events.
Additional indications for a potential tectonic boundary in Hinnoy are provided by local evidence of an Ordovician event in basement units of the Lofoten area.
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