Ch. Noblet, J. P. Lefort; Sedimentological evidence for a limited separation between Armorica and Gondwana during the Early Ordovician. Geology ; 18 (4): 303–306. doi: https://doi.org/10.1130/0091-7613(1990)018<0303:SEFALS>2.3.CO;2
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The vast extent of sedimentation deposits making up the Grès Armoricain and its equivalents over the north Gondwanan domain is used in this study to test the hypothesis of continuity between the Armorica and Gondwana plates during the Early Ordovician. The distribution of continental and marine environments, the large volume of transported elastic material, and the consistent current directions all indicate that the source of sediment supply on the north Gondwanan margin was to the south of the Sahara. Although there were local signs of incipient rifting between the two plates, Armorica was not yet detached from Gondwana by Arenigian time.