1. SACRAMENTO
STATE
Geology 103 Sedimentology and Stratigraphy Tim Horner Geology Department, CSU Sacramento
Lecture #1:
- Weathering and Sedimentary Textures
Reading assignment:
- Boggs, 5th ed., pp , ,

2. Sorting- visual and statistical values
Figure 3.4
From Boggs
5th ed., p. 51

3. Roundness- visual estimates
Figure 3.11
From Boggs
5th ed., p. 58

4. Roundness vs. sphericity
the sharpness (or roundness) of the corners
can be estimated visually or calculated
                    Average Radius of Corners and Edges  Roundness = _______________________________________                      Radius of Maximum Inscribed Circle
Sphericity
how closely the object represents a sphere (3-d)
determined by measuring x, y, z axis
calculated with an equation:

5. Methods of measuring grain size
Table 3.1
From Boggs
5th ed., p. 46

6. From Boggs, Principles of Sedimentology and Stratigraphy, 5th ed
From Boggs, Principles of Sedimentology and Stratigraphy, 5th ed., Figure 3.9, p. 57

7. Zingg Form diagram
From Boggs (2006), Principles of Sedimentology and Stratigraphy, 5th ed., Fig. 3.10, p. 58

8. Surface texture
From Boggs (2006), Principles of Sedimentology and Stratigraphy, 5th ed., Fig. 3.12, p. 60

9. Grain Fabric
From Boggs (2006), Principles of Sedimentology and Stratigraphy, 5th ed., p. 61

10. Grain Fabric (imbrication)
From Boggs, Principles of Sedimentology and Stratigraphy, 5th ed., p. 61
From Freidman and Sanders (1978), Principles of Sedimentology

11. Textural maturity
Fig. 5.6 from Boggs (2006), Principles of Sedimentology and Stratigraphy, 5th ed., p. 111

12. Compositional maturity
Table 1.2 from Boggs (2006), Principles of Sedimentology and Stratigraphy, 5th ed., p. 10

13. Compositional maturity
Fig. 4.1 from Boggs (2nd ed.?) Principles of Sedimentology and Stratigraphy

14. Effect of grain size on composition
From Blatt, Middleton and Murray, Origin of Sedimentary Rocks, 1980