On a theory of Gravitational Sliding applied to the Tertiary of Ancon, Ecuador

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Abstract
I wish to make it quite clear from the beginning that the conception of large-scale sliding due to gravitation within the mass of Tertiary sediments of North-West Peru is entirely due to Mr. Robert Ashley Baldry. My work and conclusions upon the structure of the Tertiary of the Santa Elena peninsula, Ecuador, are the result of the inspiration of that thesis, which I have extended to accord with the evidence as I read it. Mr. Baldry does not necessarily agree with all my conclusions, because he has not so far examined my evidence in the field. The earliest workers in North-West Peru—J. Grzybowski, C. Maddocks and E. R. Blundstone—described the coastal structure as a series of folds parallel to the trend of the Amotape mountains. Only Grzybowski published an account (1899), and showed in diagrammatic sections some block-faulting at Grau and folding in the Amotapes. The first published works of real importance were those of T. O. Bosworth, in the form of two papers read before this Society (1920 a, b ) which were later expanded into a book (1922). He described the structure as a mosaic of faulted blocks, the faults having throws up to 5000 feet, and considered folding to be negligible. Up to 1925, Mr. Baldry and I had examined a considerable part of the tract from the Pariñas valley to Tumbez, between the Amotape mountains and the sea, and had realized its complexity. Further detailed mapping of the Cabo Blanco region by Mr. Baldry presented such difficult

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