. Bulletin of the Department of Agriculture. Agriculture; Agriculture -- United States. 28 BULLETIN 502^ U. S. DEPARTMENT OF AGRICULTURE. From a large number of borings the topography of the underlying shale was determined as indicated in figures 4 and 5. Shale was found near the surface on three-fourths of the tract, but no shale nor water could be found at a depth of 12 feet at the southwest corner, and the alfalfa there was in good condition. The strata of the shale underlying the tract are nearly vertical and badly Proposed Ti/e Drains Ground Surface Sha/e Surface. Wafer Surf
. Bulletin of the Department of Agriculture. Agriculture; Agriculture -- United States. 28 BULLETIN 502^ U. S. DEPARTMENT OF AGRICULTURE. From a large number of borings the topography of the underlying shale was determined as indicated in figures 4 and 5. Shale was found near the surface on three-fourths of the tract, but no shale nor water could be found at a depth of 12 feet at the southwest corner, and the alfalfa there was in good condition. The strata of the shale underlying the tract are nearly vertical and badly Proposed Ti/e Drains Ground Surface Sha/e Surface. Wafer Surface SCALE OF FEET 100 50 0 \00 200 Fig. 4.—Four-acre tract near Canon City, Colo., showing plan of drainage. The shale is comparatively soft, from dark blue to reddish brown in color, and carries considerable water. The water apparently comes from the north, following along the joints in the shale strata, although it is believed that the extreme wet condition of the north- west corner is due in part to the movement of the water in the top soil from the tract to the west, which also is very wet. The under- lying shale ridges on this tract are not well defined; they are broad and flat. A rather broad shale ridge comes in at the northwest. 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 United States. Dept. of Agriculture. [Washington, D. C. ?] : The Dept. : Supt. of Docs. , Govt. Print. Off.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectagriculture, bookyear
