...Large globular or compoundglobular argillaceous concretions, coated withgypsum, were abundant at this point... 
W. E. Webb 「Buffalo Land」
...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」
...The following are among the concretions found inthe various parts:...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...Theselinguistic concretions are enough to show how hard it is for primitivethought to disjoin what is joined fast in the world of everydayexperience...
Robert Marett 「Anthropology」
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