Geology Reference
In-Depth Information
N
0
1 km
Test
Borehole
-6
-9
-12
-15
-3
Swamp
Fresh water lens
Offshore reef
Resistivity expansion
centres
Depth in m below M.S.L.
Fig. 8.25
Configuration of base of Central
Lens, Grand Gayman. (After Bugg & Lloyd
1976.)
Test Borehole
-6
N
S
180
300
92
300
240
230
260
150
290
374
200
870
400
776
450
146
276
210
200
150
300
28
0
10 m
Fig. 8.26
Geoelectric section and
geological interpretation of a profile near
Kylertown, Pennsylvania. Numbers refer to
resistivity in ohm m. (After Merkel 1972.)
Coal
Shale, clay, claystone
S
N
Road
3
0
0
260
260
54
36
26
9
6
9
2
1
4
0
120
130
105
64
120
84
100
26
76
21
Fig. 8.27
A further geoelectric section
from Kylertown, Pennsylvania. Shaded area
shows zone of contamination. Numbers
refer to resistivity in ohm m. (After Merkel
1972.)
600
Zone of contamination
360
760
640
840
500
1000
0
10 m
