Pop Quiz Sedimentology - Rounding & Sphericity
Objectives: Observe & record what you see. 1)What is the dominant condition ( Can you see the forest for the trees? ) 2)Understand what you observe : implications (circumstances of deposition) ; interpret (PM - Kind)
For each of the following images: Using the following table, assign appropriate Roundness and Sphericity classes: [ refer to slide 30, Module 4: Sedimentology, or p in Field Book for Sampling … (ver. 2) ]
1 After Powers, Numerical values below roundness and sphericity columns are class midpoints ( median rho values; Folk, 1955 ) used in statistical analysis. ( p. 2-39, Field Book … ; Schoeneberger, et al, 2002 ) Sphericity
(Degree of ) Rounding?
(Degree of) Rounding?:
(Degree of) Rounding?: (Type of) Packing?: PM: consolidated lahar Lava Cap Winery, CA Schoeneberger