86 REVIEWS 



been worked out in detail and includes numerous minor faults. The 

 great importance of the work lies in the establishing of the Ordovician, 

 Silurian, and Devonian seas in the region. The similarity of the 

 Ordovician fauna of this region with that of Minnesota and Wisconsin 

 indicates they were all part of the same invasion. Good faunal lists 

 are given. 



A. C. McF. 



Maps and Sections to Accompany Report on Contributions to the 

 Study of the Geology and Ore Deposits of Kalgoorlie, East Cool- 

 gardie Goldfield. Perth: Geological Survey of Western Aus- 

 tralia, Bulletin 69, Part III, 191 7. 



The gold deposits at Kalgoorlie, Australia, are of two types, the 

 gold-quartz veins and the gold-telluride deposits.. The bed rock of the 

 region outside of some minor metamorphosed sediments consists of 

 granite and amphibolite schists. It is with the last-named that the 

 gold is usually found. Bulletin 6g consists of fourteen plates showing the 

 areal and structural geology of the region. 



A. C. McF. 



Eleventh Biennial Report of the State Geologist on the Mineral Indus- 

 tries and Geology of Vermont. By George H. Perkins, et al. 

 Burlington, 1917-18. Pp. 209, pis. 18, figs. 10. 

 The present report consists of a number of contributions by different 



authors on the geology of the state of Vermont. These are as follows: 



I. "Physiography of Vermont," by G. H. Perkins. — The discussion 

 and description of the physiography is given in a popular though thorough 

 style. The physiographic history, which is rather complex, is well 

 summarized. The mountain areas include regions of complex igneous 

 and metamorphic history. Most of the large rivers are old and ante- 

 cedent in character. The author believes that most of the lakes of the 

 state are glacial in origin. 



II. "The Ordovician Terranes of Central Vermont," by Charles 

 H. Richardson. — The formations discussed are all pre-Trenton in age 

 and include, from base upward, the Irasburg conglomerate, the Mem- 

 phremagog slates, and Waits River limestone. A brief summary of the 

 geologic history of the state is given. 



III. Post-Glacial Sea-Level Waters in Eastern Vermont," by H. L. 

 Fairchild. — Mr. Fairchild describes the post-glacial marine features 

 found in the eastern part of the state, thus supplementing an earlier 



