...The road wound over the shale of thehillside and then into what in spring must have been upland meadows... 
John Buchan 「Mr. Standfast」
...Now one lost his footing in theloose shale and slipped back! The Kor-ul-lul were ascending—one hurledhis club at the nearest fugitive...
Edgar Rice Burroughs 「Tarzan the Terrible」
...He spurred round the same great rock a minute later, and was faced by a blank wall of shale that brought his horse up all standing...
Talbot Mundy 「King--of the Khyber Rifles」
..." We continued our course, notwithstanding the rain, across the bottom of the Quango Valley, which we found broken by clay shale rocks jutting out, though lying nearly horizontally...
David Livingstone 「Missionary Travels and Researches in South Africa」
...From the description of the rock I received, I suppose gold is found both in clay shale and quartz...
David Livingstone 「Missionary Travels and Researches in South Africa」
...Camp collectedadditional blocks of Rock Lake shale from this second locality...
Joan Echols 「A New Genus of Pennsylvania Fish (Crossoperygii, Coelacanthiformes) from Kansas」
...We therefore entered the bed of the river toexamine it, and found two seams of coal--one five feet thick and theother about six feet thick--between beds of sandstone and shale...
A C and F T Gregory 「Journals of Australian Explorations」
...Descending into a valley with a drycreek fifteen yards wide, the rocks on the south-east slope chertylimestone alternating with thin beds of shale, the strata dipping 20degrees to 30 degrees west...
A C and F T Gregory 「Journals of Australian Explorations」
...In the bed of the river several fragments of jasper and black shale werefound, the latter appearing to belong to the coal formation...
A C and F T Gregory 「Journals of Australian Explorations」
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