Facies code

Lithofacies

Sedimentary structures

Gmm

Matrix-supported. massive gravel

Weak grading

Gcm

Clast-supported massive gravel

Pseudo plastic debris flow

Gt

Gravel. stratified

Trough cross-beds

Gp

Gravel. stratified

Planar cross-beds

St

Sand. medium to very coarse. may be pebbly

Solitary or grouped trough cross-beds

Sp

Sand. medium to very coarse. may be pebbly

Solitary or grouped planar cross-beds

Sr

Sand, very fine to coarse

Ripple marks of all types

Sh

Sand, very fine to very coarse. may be pebbly

Horizontal lamination. parting lineation

Sm

Sand, fine to coarse

Massive or faint lamination

Ss

Sand, very fine to very coarse. may be pebbly

Broad. shallow scours

Sl

Sand, very fine to very coarse. may be pebbly

Low-angle (<15˚) cross-beds