Читать книгу Some Salient Points in the Science of the Earth - Sir John William Dawson - Страница 9

Table of Contents

DEDICATED TO THE MEMORY OF

JOACHIN BARRANDE,

One of the most successful Labourers

in the

Completion of the History of Life

in its earlier Stages.

Nature of the Imperfection—Questions as to its arising from Want of Continuity, from Lack of Preservation, from Imperfect Collecting.—Examples—Land Snails, Carboniferous Batrachians, Palæozoic Sponges, Pleistocene Shells, Devonian and Carboniferous Plants—Comparative Perfection in the Case of Marine Shells, etc.—Possible Cambrian Squids—Questions as to Want of First Chapters of the Record—Practical Conclusions

Cambro-Silurian Sponges restored.—Protospongia, Acanthodictya, Cyathospongia, Lasiothrix, Halichondrites, Palæosaccus, etc., from a single bed of shale in the Quebec Group, Little Metis, Canada (p. 47).