File:OilShaleEstonia.jpg

Summary
Description Outcrop of Ordovician oil shale (kukersite), northern Estonia. Author:	Wilson44691 at English Wikipedia. Date	12 May 2007 (original upload date) Source	Photograph taken by Mark A. Wilson (Department of Geology, The College of Wooster). [1] Author	Wilson44691 at English Wikipedia https://commons.wikimedia.org/wiki/File:OilShaleEstonia.jpg