23. Surface Texture ( avg . ) . A description of the physical 

 appearance of the grain based on the scheme proposed by Krumbein 

 and Pettijohn. These descriptions are recorded as dull or polished 

 and one of the following: smooth, striated, faceted, frosted, pitted, 

 or etched. 



2U, 25, and 26. Dominant, Secondary, and Other Minerals (%) . 

 A visual estimate based on microscopic examination of the sand size 

 and larger material recorded in percent. 



27. Remarks : Sediment Type - determined by the sand, silt, and 

 clay ratios of the sample based on the F. P. Shepard sediment triangle 

 (Fig. B-l). 



100 



% Sand Content 



Figure C-l . Nomenclature of Sediment Types (after Shepard, 1954, 

 Journal of Sedimentary Petrology, vol. 24, p. 157).. 



185 



