Rushton, A.W.A., Owen, A.W., Owens, R.M. & Prigmore, J.K. 2000. British Cambrian to Ordovician Stratigraphy. Geological Conservation Review Series No. 18, JNCC, Peterborough, ISBN 1 86107 4727.
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In addition to the sites in the Welsh Borderlands described above, two sites in the Charnwood Forest area expose strata conventionally assigned to the Charnian Supergroup, which is predominantly of Precambrian (Neoproterozoic) age. These sites are in the Brand Group at the top of the Charnian Succession. Following the development of new criteria for recognizing early Cambrian rocks, coupled with the discovery of Cambrian-type trace fossils, the strata are now referred to the Placentian Series at the base of the Cambrian System. The discovery of Cambrian trace fossils in the Swithland Formation (Bland and Goldring, 1995) has added significantly to the extent of Cambrian rocks in the Midlands. Though now considered representative of part of the Cambrian, these two sites will be described fully with the other sites in Charnwood Forest in the companion volume on Precambrian Rocks of England and Wales (Carney et al., in prep.). However, Dr J.N. Carney has kindly supplied brief notes on these sites for inclusion here.