When the bedding of gneiss becomes entirely obliterated, it is often difficult to distinguish that rock from granite, and in many cases it appears to pass into a true granite.
"Geology"
James Geikie
Hence we might expect to find the same mass of granite passing gradually in some places into gneiss, and in other places protruding as veins and dykes into the surrounding rocks; and this is precisely what occurs in nature.
"Geology"
James Geikie
Our borings show up all right-most of it is tough gneiss-but if we strike gravel or shale again it means more timbering, of course.
"Peter A Novel of Which He is Not the Hero"
F. Hopkinson Smith