APPENDIX A 



CORE SEDIMENT DESCRIPTIONS 



This appendix contains core sediment descriptions, based on both megascopic 

 and microscopic examinations. Color is based on damp samples as referred to 

 the Munsell color system (Munsell Soil Color Charts, 1954 ed., Munsell Color 

 Co., Inc., Baltimore, Md.); grain size is based on the Wentworth size scale. 



The marks on the left side of the stratigraphic log are placed at the mid- 

 points of sampled intervals used for size analysis. The type of analysis is 

 designated by the following codes (size data are tabulated in App. B) : 



R - Rapid Sand Analyzer (RSA) 



S - Sieve analysis 



V - Visual Accumulation Tube (VAT) 



P - Pipet analysis 



The letter B indicates the bottom of the core. 



Sediments are grouped into the following six basic categories for logging 

 (minimum unit thickness shown is 20 centimeters) : 



Mud 

 Sond 

 Muddy Sbnd 



Silt 



Column descriptions for core sediments are: 



NW = midpoint of sampled sediment used for natural water determi- 

 nations (interval usually 10 centimeters long); number is: 

 weight of wet sediment minus weight of dry sediment divided 

 by weight of wet sediment times 100. 



P = penetrometer measurement (in tons per square inch or kilo- 

 grams per square centimeter) . 



SV = shear vane measurement (in tons per square inch or kilograms 

 per square centimeter); PF = plastic flow. 



Water depths are the surveyed water depths; these depths were about 1 meter 

 above low water datum (LWD) for Lake Erie. 



45 



