National Geographic : 1893 Jul 10
THE NATIONAL GEOGRAPHIC MAGAZINE THE NATURAL BRIDGE OF VIRGINIA BY CHARLES D. WALCOTT The Natural Bridge of Virginia is one of those striking geo graphic features of America which, like Niagara falls and many other natural features, will in time disappear under the action of the agencies of erosion. The same forces that created, will ultimately destroy them. In the case of Niagara, the rate of wear of the platform over which the water rushes has been measured, and the rate of retreat of the falls of the stream is known. Natural bridge is slowly but surely wearing away; and it appears to be desirable to record by photographs and notes the present condition of the bridge as a means of deter mining in the future the changes that occur from time to time. For this purpose a set of photographs, with notes taken in 1891, have been placed in the library of the United States Geological Survey. The present article includes a few observations on the origin and the present condition of the bridge. The accompanying view (forming plate 21) is one looking northward through the arch, and it accurately represents the condition of the bridge and canyon at the time it was taken. It may be that a more detailed description, with a full series of views, will be published in the future. During the field season of 1891 I studied the rocks exposed along the channel of Cedar creek, a small tributary of the James river in Rockbridge county, Virginia. The first strata JULY 10, 1893 VOL. V, PP. 59-96, PL. 21 (59) 9-NAT. GEOG. MAG., VOL. V, 1893.
1894 Jan 31
1893 May 05