Slev - (phi quartile skewness). Is that statistical parameter which 

 Tsa measure of >>*•»*> the sum of the first and third quartile values 

 less the median and is expressed in phi units to the nearest hundredth 

 with the given value computed from the formula: 



2 



Md^ - (phi median). Is the middlemost member of the distribution 

 curve above which 50 percent of the diameters in the distribution 

 are larger and below which 50 percent of the diameters are s m aller 

 and is expressed to the nearest hundredth of a phi unit. 



17. Subsample Dry Weight . Dry weight to the nearest hundredth of 

 a gram. 



18. Sphericity (avg.) . A measure of the approach of the grain to 

 the form of a sphere, expressed as one of the following: high, medium 

 high, medium, medium low, or low. Determination was accomplished with 

 a miscroscope and was based on a comparison of the sand and larger size 

 fractions with a chart based on Waddell's method. 



19. Roundness (avg.) . A function of the sharpness of the grain 

 edges and recorded as one of the following: very angular, angular, 

 subangular, subrounded, rounded, or well rounded. Determination and 

 laboratory procedures were the same as for Sphericity . 



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

 appearance of the grain "based on the scheme propoed by Krumbein and 

 Pettijohn. These descriptions are recorded as dull or polished and 

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

 etched. 



21. Mineral Content . A rough estimate of the percentage of mineralog- 

 ical constituents contained in the sand size and larger materials hased 



on a microscopic examination of the sample. 



22. Biological Content . A rough estimate of the percentage of 

 biological constituents contained in the sand size and larger materials 

 based on a microscopic examination of the sample. 



23. Remarks . Codes for mineral trace constituents and major 

 foraminifera types, and space for additional information pertaining 

 to the bottom sample. 



181 



