684
Climatic Geomorphology
(a) Ogolian (13,000-20,000 yr BP)
(b) Tchadian-Nouakchottian (4,000-11,000 yr BP)
-
Surface I .
,It I~!U'
..........
_..
-
-,- ~-~.~.~.~-.-,---..
~
~'.'..."t~--"::.
......... .. ......
." .-'..-.-.'~.:::,:',..-~ ! - :..~<.. ....
"
(c) Tafolian-Modern ? (?-4,000 yr BP)
Surface I...~. ~
"'. : " : . : ....
r.
J~'~-~-'~--~
(d) Modern (?)
Surface 2
.~....
Oe ilia i
o i
(e) Modern (1990)
Surface 2
Surface I '~
9 "
~
~
o ~
,w/.
9
~~~o~
o o. oo