A beautiful bust of gray-Wacke in our possession probably represents the same king.
"The Complete Historical Romances of Georg Ebers"
Georg Ebers
The newest of these, connected with the higher series of coal- measures, is well exhibited along the shores of the Forth, in Fifeshire, where they consist of basalt with olivine, amygdaloid, greenstone, Wacke, and tuff.
"The Student's Elements of Geology"
Sir Charles Lyell