Some Aspects of the Distribution and Migration of Trilobites in the British Lower Palaeozoic Faunas

Certain conclusions on distribution and migration have been reached by Dr. W. K. Spencer 2 from his detailed studies of Palaeozoic Asterozoa and in conversation he has frequently expressed the wish that he might be able to compare these with data derived from similarly focused studies of other animal groups. It is reasonable to assume that the final story of migration of faunas in the Lower Palaeozoic British area cannot be told until the inequalities of fossil-collecting and naming have been overcome and until more is known of the stratigraphical position of certain faunas; any conclusions made at the present stage are tentative and are offered as an incentive to research.