Spo | Sand, fine to coarse | Overturned planar cross-beds |
Sto | Sand, fine to coarse | Overturned trough cross |
Sf | Fine sand with mud | Flaser-rippled stratification |
Sw | Fine sand with mud | Wavy-rippled stratification |
Hcs | Fine sand and mud | Hummocky cross-stratification |
Scs | Fine sand and mud | Swaley cross-stratification |
Fr | Sand, silt, mud | Ripple- to climbing ripple cross-lamination |
Fm | Sand, silt, mud | Massive |
Fl | Sand, Silt, mud | Fine lamination, very small ripples |