Geology Reference
In-Depth Information
Figure 5.26
Debris flow/lahar type deposit of sub rounded polymict (mixed)
clasts supported by a finer reddened matrix of coarse to fine epiclastic sand
and mud, Arran, Scotland.
subject to volcanic instability and seismic activity. These include the cold lahars
described above, which commonly contain angular blocks of partially lithified
fragments of a uniform pyroclastic rock type. Such deposits do
not
result directly
from volcanic activity but reflect disruption and flow of partially lithified pyro-
clastic material. Such material may not be strictly volcanic in origin and hence
may be termed sedimentary-slump deposits (cf. Tucker, this topic series).
