1. 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 , 38-41

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

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

4. Pictures of debris flow deposits:

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

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

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

8. Picture of a grain flow deposit:

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

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

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

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

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