Geology Reference
In-Depth Information
Figure B4-4.2 Close up of Brockram rock, at Hoff
is Quarry, Vale of Eden, UK. The rock is
a cross-bedded, limestone-rich, well-cemented breccia. It contains fossiliferous blocks of
appearance of a wadi-type deposit
'
-
poorly sorted, probably rapidly deposited by
ash
oods. From
field assessment, it has a low permeability at the material scale. Lens cap (58mm)
for scale.
Figure B4-4.3 More distant view of Brockram at Hoff
s Quarry. Note the fully persistent, near-vertical
master joints about 40m apart, which will control mass permeability. Evidently joints from this set would
only be intersected using inclined rather than vertical boreholes.
'
