REVIEWS Alls 
The illustrations are numerous and add greatly to the value of the 
text, and the large list of maps set forth the remarkable distribution of 
the gravel systems. 
The work is characterized by enthusiasm and a pervasive desire 
to explain in fullness and detail all of the phenomena presented. The 
observational and the rational go hand in hand and each lends interest 
to the other. 
Te eae: 
Lower Cambrian Terrane in the Atlantic Province. By C. D. Wat- 
corT, Proceedings of the Washington Academy of Sciences. 
Vol. I, pp. 301-339.. February 14, 1900. 
The object of the paper, as stated by the author, is to show the 
stratigraphic relations and successions of the Cambrian faunas of the 
Atlantic province. In the author’s correlation paper on the Cam- 
brian (Bull. 81, U. S. Geol. Surv. 1891), reference is made to unsolved 
problems of the Cambrian of this province. Mr. G. F. Matthew’s 
study of these problems has led him to conclusions not in accord with 
those tentatively set forward by Mr. Walcott. He finds the Etchemin- 
ian beds at Hanford Brook unconformably below the Protolenus zone 
and regards them as a pre-Cambrian Paleozoic terrane, and makes a 
twofold division of the Cambrian of the Atlantic province as follows : 
Dictyonema fauna. 
Upper Cambrian, - - - Peltura fauna. 
Olenus fauna. 
Paradoxides fauna. 
Lower Cambrian, - - - , Newfoundland species described. 
| Protolenus fauna. 
Mr. Walcott, having made a careful study of the Hanford Brook and 
other localities cited by Mr. Matthew in support of his position, notes 
the absence of Etcheminian débris in the overlying St. John quartzite, 
the absence of an irregularly eroded surface on the Etcheminian beds, 
and the evidence of overlap of these beds on the subjacent Algonkian, 
and holds that the patchiness and variation in thickness of the Etche- 
minian may be the result of deposition of sediments upon a very irreg- 
ular sea-bottom, and not of erosion as held by Mr. Matthew. Mr. 
Walcott believes the distinctive features of the Etcheminian fauna 
pointed out by Mr. Matthew do not necessarily separate it from the 
