64 



As storm processes wane, sand and mud accumulate and are 

 deposited as parallel laminae on top as formed under oscillatory- 

 dominant combined flow (much of it draping over low-relief 

 scours), while megaripples which slowly form and migrate on the 

 still-aggrading substrate may initially produce anisotropic 

 hummocky cross-stratification (bedding properties are different in 

 all directions). Much of the sand is reworked by waves as the 

 bottom current subsides, thus resulting in strongly oscillatory- 

 dominant combined flow and the formation of isotropic (properties 

 are similar in all directions) hummocky cross-stratification. As 

 storm wave motions decrease in speed, a reworked mantle of 

 draping lamination and vortex ripples is formed. Later, the sand is 

 buried by mud and often bioturbated (from Duke, Arnott, and Cheel 

 (1991)). 



Chapter 4 Sedimentary Features/Stratigraphy of the Inner Shelf 



