. Elements of geology : a text-book for colleges and for the general reader. Geology. Fig. Fig. 149.—Clinometer. ah X sin. of the angle of dip 30°. We sometimes find an actual sec- tion such as that represented in the figure, but more usually we observe the successive outcrops on the surface and the angle of dip, and construct an ideal section. This is easy enough if the rocks are bare, but if covered with soil, we must take advan- tage of every bare spot, of every ravine, gully, and stream - bed where the rocks may be exposed, of every quarry, railroad-cut- ting, well, etc., and put the
. Elements of geology : a text-book for colleges and for the general reader. Geology. Fig. Fig. 149.—Clinometer. ah X sin. of the angle of dip 30°. We sometimes find an actual sec- tion such as that represented in the figure, but more usually we observe the successive outcrops on the surface and the angle of dip, and construct an ideal section. This is easy enough if the rocks are bare, but if covered with soil, we must take advan- tage of every bare spot, of every ravine, gully, and stream - bed where the rocks may be exposed, of every quarry, railroad-cut- ting, well, etc., and put these together in the attempt to make a map of outcrop and a section. The strike of strata is the direction of their trend, or, more accu- rately, is the line of intersection of the strata with a horizontal plane. It is always at right angles to the line of dip. If the dip is north or south, the strike is east and west. If the strata are plane, the strike is a straight line; but if they are bent, the strike may be a curve. For 12. 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 LeConte, Joseph, 1823-1901. New York : D. Appleton and Co.
Size: 2749px × 909px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectgeology, bookyear1892
