This study arose out of a series of letters from a geologist who is evidently a theistic evolutionist. In them, he placed great faith in the index-fossil system of dating stratified rocks. Accordingly, I decided to find out just what a modern historical geology book has to say about the basis for dating the various formations from the Cambrian on up to the Pleistocene. I found "Evolution of the Earth"’ one of the clearest and most straightforward in defining the problems involved in dating each formation; also it has a remarkably fine series of illustrations. I should recommend the book to any Creationist who wishes to become acquainted with modern geological concepts, and to understand just what phenomena must be explained by a really adequate Flood geology theory of the stratified rock formation. It will be understood that in criticizing the usual evolutionary doctrines, I am not attacking "Evolution of the Earth" or its authors. I am pointing out weaknesses in the usual theory, which are in fact admitted in the book.