Example Sentences

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In general, the boundaries between formations are based on major lithological differences.

From Textbooks • Jan. 1, 2015

A group of strata having the same general lithological characters throughout may be marked by a great discrepance between the fossils above and below a certain line.

From Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6 "Geodesy" to "Geometry" by Various

But the relative chronological importance of the bars or lines in the geological record can seldom be satisfactorily discussed merely on lithological grounds.

From Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6 "Geodesy" to "Geometry" by Various

The great difference between the lithological characters of the northern and southern deposits is accompanied by an equally striking difference between their respective organic contents.

From Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 6 "Coucy-le-Château" to "Crocodile" by Various

Classification.—The earlier subdivisions of the Cretaceous rocks were founded upon the uncertain ground of similarity in lithological characters, assisted by observed stratigraphical sequence.

From Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 6 "Coucy-le-Château" to "Crocodile" by Various