Note on the "chloritic formation" on the western border of the New Haven region

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Abstract
THE rocks.of the hilly region west of the New Haven plain are, for nine miles westward, metamorphic slates, and beyond this distance mostl.ygneiss.Immediately adjoining the region there is what Percival has called a "chloritic formation," the area trending about north-llortheast; then on the west of this, with the same trend, (2) a hyc1romica slate, but little removed from argillite, becoming slightly garnetiferolls toward the western limit; next (3) a gloss.ygarnetiferous mica slate, containing some beds of gray semi-crystalline limestone; next (4) at Derby, common gneiss and coarse porphyritic gneiss.These rocks are involved in one system of folds, and are throughout conformable in beL1ding.The rock of the "cbloritic fOI•mation " varies much in texture and composition in passing from the Sound northward.Near Savin Rock, on the Sound, it is a chloritic hvdromica slate.The gray and slightly silvery surface is more or less blotched and lined with the olive-green of' chlorite, and the rock has in the mass in general a greenish tint.The slaty structure is usually perfect, and yet some layers fail of it.Grains of magnetite are common, and, less so, those of p.yrite.
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Authors J. D. Dana
Journal american journal of science
Year 1876
DOI
10.2475/ajs.s3-11.62.119
URL
https://ajsonline.org/article/63433.pdf
Keywords Keywords not found

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