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Fig. 2


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Explanation of Plate I (redrawn from Choubert, 1935). “Reconstruction of the Precambrian Continental Blocks. This construction highlights the continuity of Precambrian fold directions and their tendency to join at a single point”. Fig. 2a shows the fold directions in the Precambrian shield areas (dark blue) within the circum-Atlantic continents, as perceived and drawn by Choubert (1935), and their supposed extensions (light blue) in the intermediate areas. Fig. 2b shows a coherent pattern, as imagined by Choubert converging to a point north of Scandinavia, and suggested to be related to a general westward drift of the continents caused by the eastward rotation of the Earth, causing deformation within the sialic crust. This apparently assumed that all Precambrian orogenies could be broadly correlated, irrespective of age, and had originated from the same process, linked to the rotation of the globe rather than to movements of individual plates and collisions between those. It also assumed that all of the continents remained fixed in the same position throughout the Precambrian, and did not start to drift apart until the early Palaeozoic.

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