SACRAMENTO STATE Geology 103 Sedimentology and Stratigraphy Tim Horner Geology Department, CSU Sacramento Lecture #8: Mass movements, sediment gravity flows Reading assignment: Boggs, 5th ed., pp. 31-33, 38-41

Types of mass-movements From Boggs, Principles of Sedimentology and Stratigraphy, 5th ed., Table 2.1, p. 32

Features of a debris flow deposit: From Boggs, Principles of Sedimentology and Stratigraphy, 5th ed., Figure 2.7, p. 37

Pictures of debris flow deposits:

Matrix strength supports grains in a debris flow: From Boggs, Principles of Sedimentology and Stratigraphy, 5th ed., Figure 2.6, p. 33

Grain-to-grain interaction supports grains in a grain flow: From Boggs, Principles of Sedimentology and Stratigraphy, 5th ed., Figure 2.6, p. 33

Features of a grain flow deposit: From Boggs, Principles of Sedimentology and Stratigraphy, 5th ed., Figure 2.7, p. 37

Picture of a grain flow deposit:

Excess pore pressure supports grains in a liquified (fluidal) flow: From Boggs, Principles of Sedimentology and Stratigraphy, 5th ed., Figure 2.6, p. 33

Features of a liquified (fluidal) flow deposit: From Boggs, Principles of Sedimentology and Stratigraphy, 5th ed., Figure 2.7, p. 42

Parts of a turbidity current: From Boggs, Principles of Sedimentology and Stratigraphy, 5th ed., Figure 2.4.1, p. 34

Turbulence supports grains in a turbidity flow: From Boggs, Principles of Sedimentology and Stratigraphy, 5th ed., Figure 2.6, p. 33

Features of a turbidity flow deposit: From Boggs, Principles of Sedimentology and Stratigraphy, 5th ed., Figure 2.7, p. 37