Table 2.

Examples of lithostratigraphical hierarchies for bedrock and natural superficial deposits (following McMillan et al. 2005) and possible application to anthropogenic deposits (Ford et al. 2008; Waters et al. 2009)

Lithostratigraphical levelExample sedimentary sequence (extent) [maximum thickness]Example superficial deposit (extent) [maximum thickness]Example Artificial ground (extent) [maximum thickness]
SupergroupCoal Measures Supergroup (Great Britain) [1900 m]Great Britain Superficial Deposits Supergroup (Great Britain) [200 m]British Anthropogenic Deposits Supergroup (Great Britain) [65 m]
GroupPennine Coal Measures Group (central and northern England and North Wales) [1900 m]Britannia Catchments Group (Great Britain) [100 m]South Wales Industrial Group (South Wales Coalfield) [12 m]
FormationPennine Upper Coal Measures Formation (central and northern England and North Wales) [800 m]Breighton Sand Formation (Vale of York) [>6 m]Swansea Industrial Revolution Formation (Lower Swansea Valley) [9 m]
MemberHemsworth Member (Yorkshire coalfield) [93 m]Skipwith Sand Member (Vale of York) [2.4 m]Lower Swansea Valley Foundry Waste Member (Lower Swansea Valley) [9 m]
BedUpton Coal (Wakefield) [1.8 m]Skipwith Peat Bed (Vale of York) [0.2 m]Hafod Foundry Waste Bed (Crymlyn) [9 m]
Local unit nameThird Cherry Tree Marker (Wakefield) [14.78 m]Applicable, to local description, but far too many names to formally adopt