Transactions . .> >|Mritinii ot siliceotis i»n- iiotn l*enol)*irot mine. Hhiek Hill*.South Dakota. Shows wavy liiir« of deniureation Itelwit-n ore uiark) nncilimo><tone (light). .\lM)Ut half natural *••»<?.. o O^ y l-a;. 19.—Incipient silicification of limestone, Asjxn, Colorado. W ;< represent ([uartz crystals with smal) inclusions of limestone. Mag-nified 30 diameters. (After Lindgren, , Vol. XXX, p. ()2<S).This the nature of partly replaced rock when the process has been arrestedl)efore it was completed.

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Keywords: ., book, bookcentury1800, booksubjectmineralindustries, bookyear1895