When we hear of carbon beginning to appear in the ascending series of rocks, we are unavoidably led to consider it as marking a time of some importance in the earth's history, a new era of natural conditions, one in which organic life has probably played a part.

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Quote text and notes from Wikiquote: Robert Chambers (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.