Source: Henry Burrows
Sark består hovedsageligt af amphibolit og granit-gnejs, intruderet af magmagrænser kaldet kvarts-diorit. Nylige (1990–2000) geologiske studier og aldersbestemmelse af klipper af geologer fra Oxford Brookes University viser, at gnejsene sandsynligvis blev dannet omkring 620–600 millioner år siden under den sene præ-kambrium periode Cadomian Orogeny. Kvarts-diorit-sedimenterne blev intruderet under denne Cadomian-deformation og metamorfiske begivenhed. Alle Sark-klipperne (og dem på de nærliggende Kanaløer Guernsey og Alderney) blev dannet under geologisk aktivitet i den kontinentale skorpe over en gammel subduktionszone. Denne geologiske indstilling ville have været analog med den moderne subduktionszone for Stillehavsplade, der kolliderer og synker under den nordamerikanske og sydamerikanske kontinentale plade.
Source: Wikipedia
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Source: Henry Burrows
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Source: Henry Burrows
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