. The Bible and science. the leaves oftrees and the bones of land animals we find the shellsof fresh-water molluscs which lived in the rivers intowhich the leaves and carcases fell, and in whose bedthe shale containing them were deposited. We couldnot compare the inarine with the fresh-water molluscsif they were always found separately, but the shells offresh-water mollusca are often deposited along with thoseof marine ones at the estuaries of rivers. Thus we findfresh-water and marine shells mixed together at some USES OF MOLLUSCOUS SHELLS. 273 particular place, and we thus know that they are
. The Bible and science. the leaves oftrees and the bones of land animals we find the shellsof fresh-water molluscs which lived in the rivers intowhich the leaves and carcases fell, and in whose bedthe shale containing them were deposited. We couldnot compare the inarine with the fresh-water molluscsif they were always found separately, but the shells offresh-water mollusca are often deposited along with thoseof marine ones at the estuaries of rivers. Thus we findfresh-water and marine shells mixed together at some USES OF MOLLUSCOUS SHELLS. 273 particular place, and we thus know that they are of tliesame age. At another place we can only find fresh-water shells, and at a third only marine ones. Wecould not have compared the fresh water and marineshells, unless we had had a mixture of the two at thethird place. Without the shells it would have beenimpossible to fix the date of these three strata, becauseaiong with fresh-water shells we should have had fresh-water or land plants and fresh-water or land animals.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectnaturalhistory, booky
