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The author had suggested that the three tablazos mentioned in the literature on north-western Peru might all be the same one, faulted so as to appear at different levels. Recent work (as yet unpublished) had shown that, although no difference was apparent in the faunas of the three tablazos, their field nature indicated that they were different deposits. The speaker wondered whether any differences had been observed in the field between the tablazos present in south-western Ecuador. The tablazos were flat plateaux covering a large part of north-western Peru, where they were hardly affected by faulting; only one small fault was known to cut a tablazo there.
Was the fauna present in the Ancón Point formation the Hannotoma mollusc fauna ? A symposium held to determine the age of this fauna found that it was present in brackish-water beds of both Eocene and Oligocene age.
Dr. S. H. SHAW asked the author what was the scale of the photographs that had been used and for details of their other characteristics.
The paper described photogeological work done under the most suitable conditions, that was to say, with opportunities for the checking of the photogeological interpretation by field observations. He would like to make one remark with regard to photogeological work generally, and welcomed the opportunity of doing so before an audience that
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This 250-word extract was created in the absence of an abstract.
