BGS Rock Classification Scheme

Ironstone, carbonaceous

Code	CBFEST
Description	Ironstone, carbonaceous
Qualifiers	carbonaceous
Definition	Sedimentary rock, no recognisable depositional texture with clasts >50% iron-bearing minerals (>15wt% iron). Clast size not defined. 5-20%visible carbon/humic material.
Linked data	http://data.bgs.ac.uk/id/EarthMaterialClass/RockName/CBFEST

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CAVEAT

"Thumbnail" definitions attached to some of the table entries are an interim attempt to provide simple short descriptions of the "unqualified" rock types presented within the BGS Rock Classification Scheme. Every effort has been made to ensure accuracy and consistency but minor contradictions or omissions might be present. The BGS welcomes any feedback pointing out such minor imperfections and/or providing constructive comment and suggestions for improvement of the definitions. In the first instance such feedback should be directed to Dr Tim McCormick.