By Kevin Burke, Yanni Gunnell
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Extra info for The African Erosion Surface: A Continental-scale Synthesis of Geomorphology, Tectonics, and Environmental Change over the Past 180 Million Years (GSA Memoir 201)
Sample text
90–84 Ma); (2) later Campanian times (ca. 75–70 Ma); and, (3) perhaps with varying intensity over a longer interval extending from latest Maastrichtian times (ca. 66 Ma) throughout the Paleocene (65–53 Ma) and early Eocene (53–45 Ma), ending in Lutetian times (ca. 45 Ma). The local record in the Iullemeden Basin (Kogbe, 1981; Boudouresque, et al. , Thomas, 100 1994; Aleva, 1994; Tardy and Roquin, 1998) recognize deep 90 lateritic and bauxitic weathering as having occurred between ca. 90 Ma and ca.
18) (Scotese and Sager, 1988). Conditions are also likely to have been more humid in West Africa from 180 Ma onward because zonal winds that had crossed the central Atlantic Ocean would have penetrated that area with more moisture than they carried when they reached the eastern parts of AfroArabia. The west of the continent remained within orthobauxiteforming equatorial climates while the eastern part, which rotated farther latitudinally between the Jurassic and the Oligocene (200–30 Ma), experienced somewhat drier climates, in which ferruginous laterite formed with gibbsite as a minor constituent.
To the continental terminal. In the Iullemeden Basin (Fig. ” Those episodes were during (1) late Turonian to Santonian times (ca. 90–84 Ma); (2) later Campanian times (ca. 75–70 Ma); and, (3) perhaps with varying intensity over a longer interval extending from latest Maastrichtian times (ca. 66 Ma) throughout the Paleocene (65–53 Ma) and early Eocene (53–45 Ma), ending in Lutetian times (ca. 45 Ma). The local record in the Iullemeden Basin (Kogbe, 1981; Boudouresque, et al. , Thomas, 100 1994; Aleva, 1994; Tardy and Roquin, 1998) recognize deep 90 lateritic and bauxitic weathering as having occurred between ca.