...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」
...The strata under the conglomerate are all of red clay shale of different degrees of hardness, the most indurated being at the bottom...
David Livingstone 「Missionary Travels and Researches in South Africa」
...Such a "set," if longestablished, will penetrate through earth, clay, and sub-soil, to somestratum of shale, or sand, or loose rock...
Alfred E. Pease 「The Badger」
...Specimensare found scattered throughout the Rock Lake shale (see p...
Joan Echols 「A New Genus of Pennsylvania Fish (Crossoperygii, Coelacanthiformes) from Kansas」
...The coelacanth fishes from the Rock Lake shale are part of the variedfauna collected from Garnett...
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」
...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」
...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」
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