Little Hat Mountain, CALittle Hat Mountain, CA

Jess Valley, CAJess Valley, CA

Mass wasting featuresMass wasting features

• Brook, question 7.1, King Hill, IDBrook, question 7.1, King Hill, ID– 7.1a7.1a

•What type of mass movement occurred and What type of mass movement occurred and how did it happen? how did it happen?

•Did debris reach King Cr? If so, where? Give Did debris reach King Cr? If so, where? Give coordinates. coordinates.

– 7.1c7.1c•Three well-defined slump blocks are visible in Three well-defined slump blocks are visible in

the middle photo. Give their grid coordinates. the middle photo. Give their grid coordinates.

C.9-2.1 or E.0-2.1

rotational block slump

yes, at A.0-3.0 to A.4-3.4yes, at A.0-3.0 to A.4-3.4

• Brook, question 7.2, Slumgullion, COBrook, question 7.2, Slumgullion, CO– 7.2a7.2a

•What kind of mass movement occurred?What kind of mass movement occurred?

– 7.2b7.2b•What relationship is there between the What relationship is there between the

moved material and Lake San Cristobal?moved material and Lake San Cristobal?

earthflow (more soil than rock/soil mix)

earthflow dammed the river creating Lake San Cristobal

Mass wasting featuresMass wasting features

• Brook, question 7.3, Sundog Basin, Brook, question 7.3, Sundog Basin, CanadaCanada– What type of mass movement has What type of mass movement has

occurred in the unconsolidated sands occurred in the unconsolidated sands (D.1-2.0)?(D.1-2.0)?

– What could have triggered it?What could have triggered it?erosion of the slope toe by the riverreduced support at toe and weight ofoverlaying material triggered failure

rotational soil slumprotational soil slump

Gladstone, Oregon