Williamson P.G., — Punctuated equilibrium, morphological stasis and the palaeontological documentation of speciation: a reply to Fryer, Greenwood and Peake's critique of the Turkana Basin mollusc sequence

1985. In 8vo, offp., pp. 19 with 5 figs. Offprint from Biol. Jour. Linn. Soc, 26. We add: In reply to Fryer, Greenwood and Peake, ibidem pp. 4