Lithofacies Code

Lithology

Sedimentary Structures

Interpretation

Sm

Very fine- to medium-grained sandstone

Massive

Rapid deposition (or homogeneous sediments)

Smg, Smi

Very fine- to medium-grained sandstone

Massive, normally graded (g) or inversely graded (i)

Fallout from suspension

Sl

Very fine- to medium-grained sandstone

Planar laminated

Upper plane bed sands

Sr

Very fine- to fine-grained sandstone

Rippled laminated

Lower flow regime ripples

Sh

Very fine- to medium-grained sandstone

Hummocky stratification

Storm deposits

SSm

Fine- to medium-grained siltstone

Massive

Rapid deposition (or homogeneous sediments)

SSmg, SSmi

Fine- to medium-grained siltstone

Massive, normally graded (g) or inversely graded (i)

Fallout from suspension

SSl

Very fine- to fine-grained siltstone

Planar laminated

Upper plane bed silts

SSMl

Heterolithic siltstone-clayshale rhythmites

Planar laminated

Hemipelagites

Ml

Mudstone

Planar laminated

Fallout from suspension

Mm

Mudstone

Massive

Rapid deposition (or homogeneous sediments)

Mmc

Mudstone

Massive, with concretions

Pre-compaction concretions

Cl

Claystone

Planar laminated

Fallout from suspension

Cm

Claystone

Massive

Rapid deposition (or homogeneous sediments)