Geological and Geophysical Survey of Fluorspar Areas in Hardin County, Illinois
Description:
From abstract: Pt 1. The present work seems to confirm the genetic theory previously published, namely that [Illinois Cave in Rock] deposits were formed by ascending solutions. These solutions probably followed minor fissures that connected below with larger fissures, which in turn probably connected with a major fault zone. It is believed that where such minor fissures extended upward only to the shale or other impervious cap rock, or were greatly reduced in size where they penetrated such bed…
more
Date:
1944
Creator:
Currier, Louis W.; Wagner, Oscar Emil, Jr. & Hubbert, M. King
Item Type:
Refine your search to only
Report