clay-slate

• As far as my experience has gone, I should speak only of clay-slate being associated with mica-slate, for when near the metamorphic schists —  More Letters of Charles Darwin — Volume 2
• We find in it trap-porphyries, greenstones, clinkstones, basalts, and amygdalolds, largely mingled with fragments of the granitic, clay-slate, and quartz rocks. —  The Cruise of the Betsey or, A Summer Ramble Among the Fossiliferous Deposits of the Hebrides. With Rambles of a Geologist or, Ten Thousand Miles Over the Fossiliferous Deposits of Scotland
• We find its nearest neighbor, -- the steep, brown, barren island of Longa, which is composed of the ancient Red Sandstone of the district, -- differing as thoroughly from it in aspect as a bit of granite differs from a bit of clay-slate; and the whole prospect around, save the green Liasic strip that lies along the bottom of the Bay of Broadford, exhibits, true to its various components, Plutonic or sedimentary, a character of picturesque roughness or bold sublimity. —  The Cruise of the Betsey or, A Summer Ramble Among the Fossiliferous Deposits of the Hebrides. With Rambles of a Geologist or, Ten Thousand Miles Over the Fossiliferous Deposits of Scotland
• And then I have begun to paint yet a third time with thick Old Red Sandstone pigment; and yet again to break up and wear down, -- here to insert a tenon of the Old Red deep into a mortise of the grauwacke, as at Gamrie, -- there to dovetail it into the clay-slate, as at Tomantoul, -- yonder, after laying it across the upturned quartz-rock, as at Cullen, to rub by much the greater part of it away again, leaving but mere remainder-patches and fragments, to mark where it had been. —  The Cruise of the Betsey or, A Summer Ramble Among the Fossiliferous Deposits of the Hebrides. With Rambles of a Geologist or, Ten Thousand Miles Over the Fossiliferous Deposits of Scotland
• a district of grauwacke, now over a re-formation of the Lias; anon he finds himself on a primary limestone, -- gneiss, syenite, clay-slate, or quartz-rock; and yet anon amid the fossils of some outlier of the Old —  The Cruise of the Betsey or, A Summer Ramble Among the Fossiliferous Deposits of the Hebrides. With Rambles of a Geologist or, Ten Thousand Miles Over the Fossiliferous Deposits of Scotland

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