Page:The Journal of geology (IA journalofgeology11893univers).pdf/329

This page has been proofread, but needs to be validated.
REVIEWS.
751

Mr. Bain's paper deals with the distribution and relations of the St. Louis limestone in Mahaska county, where it is shown to have the same irregularity as to thickness and structure as it presents generally in Iowa. To explain the irregularity in the surface of this formation, appeal is made to erosion during Kaskaskia time, when Iowa was a land surface. This would imply a considerable elevation in order to produce the carving, a conclusion not wholly free from doubt. In some localities a sandstone, treated as presumably belonging to the coal measures, rests upon the limestone.

The remaining paper, by Mr. Houser, is devoted to a discussion of some lime-burning dolomites, and dolomitic building stones from the Niagara.

C. H. Gordon.

This article is issued from Wikisource. The text is available under Creative Commons Attribution-Share Alike 4.0 unless otherwise noted. Additional terms may apply for the media files.