Word: thicker
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Dates: during 1890-1899
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...They represent the tracts of country which have been formed the longest, parts of them having always remained above water. The sediment washed by the sea from these protruding tracts has formed lime-stone and sand stone about their edges and the strata of these rocks is therefore much thicker here than in regions like the Mississippi basin which have been often submerged. One of the great theories of mountain formation takes these sedimentary rocks and their overloading of the earth's crust for the cause of the uplifting. The study of such movements and their influence on neighboring formations...