| | CATHOLIC ENCYCLOPEDIA: Egypt |
 | | Intimately connected with the formation of the valley are the sands and loams occurring to the south of the pyramids of Gizeh, as is shown by numerous Pliocene fossils they contain (Baedeker, Egypt, p. |
 | | The so-called petrified forests near Cairo consist of the stems of trees silicified by the action of the siliceous thermal springs which bubbled forth amid the networks of lagoons existing in these parts in Oligocene times. |
 | | Those forest trees are still more common in the Fayûm, where innumerable bones of extinct terrestrial and marine mammals and reptiles have been found in sands of the same geological age (Baedeker, loc. |
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