. Annals of the New York Academy of Sciences. Science. 46 ANNALS NEW YORE ACADEMY OF 8CJENCES Section east of Lyons, Colorado Feet "Dakota," Sandstone, hard massive, Olive green massive sbale, vs^itli some sandstone layers 150 Light grayish green massive shale 30 Soft to hard gray sandstone, fine grained 15 Red, maroon, and green massive shale 150: Morrison, Massive buff sandstone, moder- ately fine 10 Grayish green to maroon mas- sive shale, with thin layers of fine grained sandstone 40 Covered 25 Upper Wyoming, Soft buff sandstone 30. Fig. 3.—Section of the Morrison and over
. Annals of the New York Academy of Sciences. Science. 46 ANNALS NEW YORE ACADEMY OF 8CJENCES Section east of Lyons, Colorado Feet "Dakota," Sandstone, hard massive, Olive green massive sbale, vs^itli some sandstone layers 150 Light grayish green massive shale 30 Soft to hard gray sandstone, fine grained 15 Red, maroon, and green massive shale 150: Morrison, Massive buff sandstone, moder- ately fine 10 Grayish green to maroon mas- sive shale, with thin layers of fine grained sandstone 40 Covered 25 Upper Wyoming, Soft buff sandstone 30. Fig. 3.—Section of the Morrison and over- lying and underlying Jjeds at Laporte, Colorado. Fig. 4.—Section of the Morrison and ad- jacent formations east of Lyons, Colo- rado. A-B Morrison. Scale, 125 feet to 1 1.—Lakota ; 2.—Morrison ; 3.—Red Beds. incli. (Darton.) Scale, 125 feet to 1 inch. (Darton.) The Morrison formation in the vicinity of Bonlder was described by Fenneman (1905, 9). The following remarks on the formation in this district are based on Eenneman's description. Sections of the Morrison at various places in this area differ greatly. In the main, however, the formation contains a large proportion of light-colored clays, some mod- erately indurated and others of flinty hardness, much gray sandstone, often calcareous, and at various horizon's beds of highly compact lime- stone. A very much generalized section would present the beds in about the following order, beginning at the base: sandstone, clays, limestone, clays. The first and last members of the series are persistent, but the intervening clays and limestone may show two or three alternations and may inclose prominent sandstones. Fenneman estimates the maximum thickness to be a little less than 400 feet. The formation in this district. 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
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectscience, bookyear1877
