Figure 4
Paleogeographic reconstruction for Lower Ordovician 490 Ma. South Polar Mollewiede Projection.
Modified from Wilde et al. (1997) and updated with Plate Tracker v.2 by Eldridge, Walsh, and Scotese (2000) with permission.
The samples are from the Tremadoc and Arenig so the reconstruction time is approximately medial
thus the actual map positions would vary with plate motions.
Group IV
Baltica samples: D = Denmark, E = Estonia, S = Sweden, O = Norway (Oslo district). Avalonia samples: NB = New Brunswick.
Group III:
Bel = Belgium, Bol = Bolivia, Q = Quebec (Levis).