discontinuity may appear on subsequent strength profiles. The same 

 effect may occur when the site has been above sea level for a time 

 interval. 



A vane shear strength evaluation can, therefore, detect the 

 variations in the strength profile (for cohesive soils) associated with 

 changes in the geologic realm. However, a careful mineralogic and geo- 

 logic investigation is usually necessary to correlate the specific occur- 

 rence with the strength variation. 



RESULTS 



The results of the vane shear and laboratory test programs are 

 presented in Table 4. Each result indicates the particular result 

 considered most representative for the entire sediment section. In 

 several instances, tests such as grain size, carbon content, and spec- 

 ific gravity were not performed on a given section. A dash in the 

 tabulated data reflects this condition. Although four vane shear tests 

 were usually conducted on a sample section, the results show a single 

 value for the entire section. This value represents the average of the 

 vane strength measurement in the sample section. " - 



The general sediment environment was defined after reviewing articles 

 (see DISCUSSION OF RESULTS) in various geological journals and conversing 

 with several marine geologists (Hamilton, 1970; Dill, 1970). 



15 



