...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」
...The manner of disinterment varies,but much depends on whether the fossillies in comparatively loose shale or is imbeddedin the solid rock, whether the strata are levelor dip downward into the hillside...
Frederic A. Lucas 「Animals of the Past」
...The blue shale,on the contrary, frequently contains numerous concretions,and great abundance of thin layers ofgypsum and crystals of the same...
W. E. Webb 「Buffalo Land」
...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」
...The new skeleton of Hesperoherpeton lies in an oblong block oflimy shale measuring approximately 100×60 mm...
Theodore H. Eaton 「A New Order of Fishlike Amphibia From the Pennsylvanian of Kansas」
...Specimensare found scattered throughout the Rock Lake shale (see p...
Joan Echols 「A New Genus of Pennsylvania Fish (Crossoperygii, Coelacanthiformes) from Kansas」
...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」
...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」
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