I have given my reasons for believing that most of our great formations, rich in fossils, were deposited during periods of subsidence; and that blank intervals of vast duration, as far as fossils are concerned, occurred during the periods when the bed of the sea was either stationary or rising, and likewise when sediment was not thrown down quickly enough to embed and preserve organic remains.
Azaldu ditut gure formazio handi eta fosiletan aberats gehienak depresio aldietan metatu zirela uste izateko ditudan arrazoiak; baita, itsasoaren hondarra geldi edo gorakadan zen aldietan, eta era berean sedimentua hondakin organikoak lurperatu eta kontserbatzeko bezain azkar metatzen ez zenean, fosilei dagokienez hutsarte izugarri luzeak gertatu zirela pentsatzeko ditudanak ere.