Keywords: OldRedSandstone2.jpg en Cross-section through a sample of the Old Red Sandstone showing quartz and chert pebbles; central England own Wilson44691 2008-08-11 Photograph taken by Mark A Wilson Department of Geology The College of Wooster http //www3 wooster edu/geology/MWilson html Old Red Sandstone Geology of England Devonian geology Sandstone samples |