22
STANLEY IM. DAVIS
0
100
2 0 0
3 0 0
4 0 0
I
I
I
I
H
Scale in miles
□
Area of
Post-Nubian
sediments
Nubian
sandstone
and closely
related rocks
Pre-Nubian
granitic
rocks
Fig. 11. Nubian sandstone in northeast Africa. Outcrop area includes some surficial
sediments such as sand dunes and alluvium. Arrows show only approximate direction
of regional migration of groundwater.
tions. Most workers have, therefore, postulated that water in the aquifer
today had its origin during Late Pleistocene time when rainfall was probably much larger than present. Radiometrie dates of the
14
C in the water
tend to support this conclusion. Thatcher et al (1961) report dates which
suggest that much of the water may be from 20,000 to 30,000 years old.
The Nubian Aquifer has an almost limitless amount of water in storage.
STANLEY IM. DAVIS
0
100
2 0 0
3 0 0
4 0 0
I
I
I
I
H
Scale in miles
□
Area of
Post-Nubian
sediments
Nubian
sandstone
and closely
related rocks
Pre-Nubian
granitic
rocks
Fig. 11. Nubian sandstone in northeast Africa. Outcrop area includes some surficial
sediments such as sand dunes and alluvium. Arrows show only approximate direction
of regional migration of groundwater.
tions. Most workers have, therefore, postulated that water in the aquifer
today had its origin during Late Pleistocene time when rainfall was probably much larger than present. Radiometrie dates of the
14
C in the water
tend to support this conclusion. Thatcher et al (1961) report dates which
suggest that much of the water may be from 20,000 to 30,000 years old.
The Nubian Aquifer has an almost limitless amount of water in storage.