The BGS Lexicon of Named Rock Units — Result Details

Hemsworth Member

Computer Code: HEMS Preferred Map Code: notEntered
Status Code: Full
Age range: Bolsovian Substage (CC) — Bolsovian Substage (CC)
Lithological Description: Grey mudstones, siltstones and sandstones with thin coals.
Definition of Lower Boundary: Base of Fourth Cherry Tree Marker (mudstones with bivalves and euestheriids).
Definition of Upper Boundary: Base of First Cherry Tree Marker (mudstones with bivalves).
Thickness: c.90m
Geographical Limits: Yorkshire Coalfield.
Parent Unit: Pennine Upper Coal Measures Formation (PUCM)
Previous Name(s): Hemsworth Division (-955)
Alternative Name(s): none recorded or not applicable
Type Section  Cherry Tree Borehole (near South Elmsall, Yorkshire). SE41SE/9. Depths of member 16.61-105.38m (samples RG 4241-4455 from 50' to 1946'). 
Goossens, R F and Smith, E G, 1973. The stratigraphy and structure of the Upper Coal Measures in the exposed Yorkshire Coalfield between Pontefract and South Kirkby. Proceedings of the Yorkshire Geological Society, Vol.39, 487-514. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable