. Elements of geology : a text-book for colleges and for the general reader. Geology. Fig. 138.—Diagram showing Thinning out of Beds: a, sandstones and conglomerates; b, limestones. extent of these cakes depends upon the nature of the material. In fine materials strata assume the form of extensive thin sheets, while coarse materials thin out more rapidly, and are therefore more local. The most important apparent exception to the law of original hori- zontality is the phenomenon of oblique or cross lamination. This kind of lamination is formed by rapid, shift- ing currents, bearing abundance of
. Elements of geology : a text-book for colleges and for the general reader. Geology. Fig. 138.—Diagram showing Thinning out of Beds: a, sandstones and conglomerates; b, limestones. extent of these cakes depends upon the nature of the material. In fine materials strata assume the form of extensive thin sheets, while coarse materials thin out more rapidly, and are therefore more local. The most important apparent exception to the law of original hori- zontality is the phenomenon of oblique or cross lamination. This kind of lamination is formed by rapid, shift- ing currents, bearing abundance of coarse materials, or by chafing of waves on an exposed beach. Many examples of similar lamination are found in rocks of previous epochs. Figs. 139 and 140 represent such examples. In some cases oblique lamination may be mistaken for highly-inclined strata ; careful examination, however, will show that the strata are not parallel with the laminae. The strata were. Fig. 139.—Oblique 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.
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