Description:
Franciscan rocks in The Geysers Geothermal Resources
Area (GRA) constitute a greatly deformed and
chaotic assemblage of rocks known as melange which,
under natural conditions, poses problems to slope stability.
Unstable conditions inherent in the melange are accentuated
by the steepness of slopes, chemical alteration
of the rocks, and numerous faults and shear zones. Adverse
effects that may be .experienced- with development of melange
terrain can, however, be mitigated if potential problem
areas are recognized before development begins and
if good engineering geology·and engineering practices are
followed.