The BGS Lexicon of Named Rock Units — Result Details

Blackstone Bed (Jurassic)

Computer Code: BLST Preferred Map Code: notEntered
Status Code: Full
Age range: Kimmeridgian Age (JD) — Kimmeridgian Age (JD)
Lithological Description: Massive oil shale with calcareous and pyritic concretions and pyritized Saccocoma.
Definition of Lower Boundary: Sharp transition to mudstone (sometimes calcareous) of the Kimmeridge Clay Formation.
Definition of Upper Boundary: Sharp transition between the Blackstone oil shale and overlying mudstone of the Kimmeridge Clay Formation.
Thickness: 0.6 m.
Geographical Limits: Dorset.
Parent Unit: Kimmeridge Clay Formation (KC)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  The cliff sections between Kimmeridge Bay [SY 905 791] and Chapman's Pool [SY 955 771]. 
Reference(s):
Cox, B M, and Gallois, R W. 1981. The stratigraphy of the Kimmeridge Clay of the Dorset type area and it's correlation with some other Kimmeridgian sequences. Report of the Institute of Geological Sciences, No.80/4. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable