Give the area of some delta deposits.
How do the deep-sea deposits now forming compare in extent with the earlier formations?
State the several circumstances by which a succession of deposits would be arranged in strata.
How are those differences produced upon which the separation into independent formations depends?
Why are marine deposits nearly horizontal?
Fig. 75.
How are the irregular stratifications produced?
What peculiarity in the fossils will distinguish the lacustrine and marine deposits?
What peculiarity in reference to fossils will characterize the deep-sea deposits?