. A treatise on rocks, rock-weathering and soils;. Petrology; Soils. Fig. 22.—^Plint implement showiiag weathered surface. Jurassic or early Cretaceous age, are often decomposed and dis- integrated to a maximum depth of 200 feet, the extreme upper, ^American Geologist, June, 1889, p. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Merrill, George P[erkins] 1854-. New York, London, The Macmillan company

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Keywords: ., bookcentury1900, bookdecade1910, booksubjectpetrolo, bookyear1913