On the great lava-flood of the Northwest and on the structure and age of the Cascade Mountains

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1874
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Abstract
Some important points suggested by the previous discussion.A. Successive outflows of Oascade lava.-Mountain-making,w hetller by the up-swelling of sediments or the out-squeezing of liquid, is probably always a slow process.The latter mode, however, viz: the up . .builrling by out . .squeezed matters is probably more paroxysmal than the former.'Ehe Cascade Range was probably built up paroxysmally by many successive outflows, occupying a very long period of time.I believe it possible to detect these successive outflows-to detect in its exogenous structure the lines of mountain-growth.It is well known that columnar basalt, when in thiek masses, is often divided into horizontal layers by planes which inter . .rupt the continuity of the vertical columns.Magnificent exam pIes of this structure are found in the basalts of the Cascade Range.On the nearly perpendicular cliffs of Columbia Ri ver, ten or twelve horizontal layers may be distinctly counted (figs. 2 and 3), and doubtless many others exist, but their out . .cl"Opping edges are covered with the products of disintegration.On the perpendicular cliffs of the Des Chutes River (fig.1), at least twenty layers can be clearly made out, and about ten more with less certainty, on one section.Still higher up on the gentler slope are seen many others, thOllgh their out-cropping edges are mostly covered up by debris and soil.That these
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Authors Jérémy Leconte
Journal american journal of science
Year 1874
DOI
10.2475/ajs.s3-7.40.259
URL
https://doi.org/10.2475/ajs.s3-7.40.259
Keywords Keywords not found

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