Edwards, D., Baldauf, J.G., Bown, P.R., Dorning, K.J., Feist, M., Gallagher, L.T., Grambast-Fessard, N., Hart, M.B., Powell, A.J. & Riding, R. 1993. 'Algae'. In M.J. Benton (ed.), The Fossil Record 2. Chapman & Hall, London: [15]-40.