4.4 GLACIAL PROCESSES
117
Fig. 4.25. Geologist overwhelmed at the sight of Late Pre-Cambrian glacial diamictite, Ella Island, East
Greenland.
tions of diamictites from the Falkland Islands and New South Wales have been given by
Frakes and Crowell (1967) and Whetten (1965), respectively.
Ancient glacial deposits are rare, but they provide a fruitful source for academic controversy out of all proportion to their volume. The economic importance of glacial deposits is similarly equivocal. They lack organic content, so petroleum must enter them
from older or younger source rocks. The diamictites may provide regionally extensive
seals, and the fluvioglacial sands make excellent petroleum reservoirs, as seen in several Permo-Carboniferous basins of Gondwanaland (Potter et al., 1995). Similarly the
Cambro-Ordovician fluvial sands of the southern shores of Tethys may have been laid
117
Fig. 4.25. Geologist overwhelmed at the sight of Late Pre-Cambrian glacial diamictite, Ella Island, East
Greenland.
tions of diamictites from the Falkland Islands and New South Wales have been given by
Frakes and Crowell (1967) and Whetten (1965), respectively.
Ancient glacial deposits are rare, but they provide a fruitful source for academic controversy out of all proportion to their volume. The economic importance of glacial deposits is similarly equivocal. They lack organic content, so petroleum must enter them
from older or younger source rocks. The diamictites may provide regionally extensive
seals, and the fluvioglacial sands make excellent petroleum reservoirs, as seen in several Permo-Carboniferous basins of Gondwanaland (Potter et al., 1995). Similarly the
Cambro-Ordovician fluvial sands of the southern shores of Tethys may have been laid