ABSTRACT 



Notations of bottom types which appear on navigation charts 

 are a valuable source of data used in compiling bottom sedi- 

 ment charts. The correct and consistent interpretation of 

 these notations in terms of the sediment classification (Mud, 

 Mud-Sand, Gravel, Shell and Coral) used on U. S. Navy Hydro- 

 graphic Office bottom sediment charts is essential in main- 

 taining high standards of reliability. This glossary indicates 

 how bottom sediment notations are reconciled to this classi- 

 fication. 



a glossary 



56) 



RETURNED 



