Abstract
IN Prof. Shepard's interesting communication he differs from me on two main points. First, he thinks that the “canyons” were probably formed by subaerial erosion, whereas I do not know how they were formed; but I feel fairly certain that at any rate on the east coast of the United States the land has not recently stood thousands of feet higher than at present. To me it is inconceivable that the flatlying sediments of the coastal plain can have been raised and lowered without leaving a trace in their structure and without affecting the physiography except near the outer edge. In California, broadly speaking, anything may happen. Large changes have occurred recently and are presumably still in progress, and there is nothing inherently impossible in assuming large relative movements of sea and land. It is the extension of the movements to practically the whole length of the shores of all the oceans that raises such great difficulties.
Similar content being viewed by others
Article PDF
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
BULLARD, E. Submarine Geology and Geophysics. Nature 146, 432 (1940). https://doi.org/10.1038/146432a0
Issue Date:
DOI: https://doi.org/10.1038/146432a0
Comments
By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.