Reviews. 



PRE-CAMBRIAN SUMMARIES FOR 1901. 



Van Hise 1 describes the geology of the Lake Superior iron 

 ore deposits. The general succession of formations in the iron- 

 bearing districts appears in the following table: 



'"The Iron-Ore Deposits of the Lake Superior Region," by C. R. Van Hise, 

 assisted in Mesabi and Vermilion sections by C. K. Leith and J. Morgan Clements 

 respectively, Tweniy-fiist Ann. Rept. U. S. Geol. Surv., Part III, 1901, pp. 305-434; 

 with geological maps. 



