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Cook P. J. and Shergold J. H. (1986) Proterozoic and Cambrian phosphorites—nature and origins. In Phosphate Deposits of the World Volume 1. Proterozoic and Cambrian Phosphorites (eds. P. J. Cook and J. H. Shergold). Cambridge University Press, Cambridge, pp. 369-386. 

Mendelson C. V. and Schope J. W. (1992) Proterozoic and selected Early Cambrian microfossils and microfossil-hke objects. In The Proterozoic Biosphere, a Multidisciplinary Study (eds. J. W. Schopf and C. Klein), pp. 865-951. Cambridge University Press, Cambridge. 

Bengston, S. and Lipps, J.R. (1992) The Proterozoic-Early Cambrian evolution of metaphytes and metazoans , in Schopf, J.W. and Klein, C. (eds) The Proterozoic biosphere, Cambridge Cambridge University Press, pp. 427-8. 

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See also in sourсe #XX -- [ , , , , ]

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