CHAPTER III.

=GEOLOGICAL HISTORY.= Pp. 22–53.

Rock-building. Calcareous rocks. Geological sections. Inversion of strata. Table of Strata:

I. Archaean, 34–36. II. Cambrian, 36–37. III. Ordovician, 37–38. IV. Silurian, 38. V. Devonian, 39. VI. Carboniferous, 39–45. VII. Permian, 45–47. VIII. Trias., 47–48. IX. Jurassic, 48–49. X. Cretaceous, 50–51. XI. Tertiary, 51–53. Geological Evolution.