A typical shale barren with several endemic and characteristic shale barren plants was found on the Rose Hill formation in Allegany County, Maryland, apparently the first shale barren recorded from bedrock of Silurian age.
A typical shale barren with several endemic and characteristic shale barren plants was found on the Rose Hill formation in Allegany County, Maryland, apparently the first shale barren recorded from bedrock of Silurian age.