According to their reconstructed paleogeographic map
, the domain corresponding to present-day Estonia likely started to receive terrigenous clastics not only from the core of Baltica in the north/ west, as was the case during the Ediacaran, but also from uplifted areas in the east/southeast since the Early Cambrian appearance of this embayment.
Several previous paleogeographic reconstructions have been also used in order to complete our reconstruction of areas where data were not available (Ziegler, 1988; Hay et al., 1999, Masse et al., 2000; Berastegui et al., 2002; Rosales et al., 2002; Mas et al., 2002b; 2004; Garcia-Mondejar et al., 2004; Robador and Garcia-Senz, 2004; as well as the paleogeographic maps
of Ronald Blakey, available at http:// www2.nau.edu/rcb7).
The plate tectonic evolution of the North American continent has been reconstructed in considerable detail by Ron Blake, whose series of paleogeographic maps
is posted on his website at www.nau.edu.
The first chapter features new paleogeographic maps
that document Gondwana's geological history.
of the Late Ordovician in the Central China region and their explanation.
The creation of such maps requires three things; an extensive database of fossil molluscan taxa, paleogeographic maps, and geologic maps.
Each type locality age bracket was then plotted on the appropriate paleogeographic maps (e.g., the 65mya to 70mya set was plotted on both the 67mya and 70mya paleogeographic maps), thus registering fossil localities in the suggested paleolandscapes.