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The Cross Section
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Species, Species Concepts and Primate Evolution
A world of categones devmd of spirit waits for life to return. Saul Bellow, Humboldt's Gift The stock-in-trade of communicating hypotheses about the historical path of evolution is a graphical representation called a phylogenetic tree. In most such graphics, pairs of branches diverge from other branches, successively marching across abstract time toward the present. To each branch is tied a tag with a name, a binominal symbol that functions as does the name given to an individual human being. On phylogenetic trees the names symbolize species. What exactly do these names signify? What kind of information is communicated when we claim to have knowledge of the following types? "Tetonius mathewz...
Geology and Paleoenvironment of the Oligocene Jebel Qatrani Formation and Adjacent Rocks, Fayum Depression, Egypt
Sedimentologic studies of lower Tertiary rocks in the Fayum Depression of Egypt clarify the alluvial environment and paleography of northen Egypt during the Eocene-Oligocene Tethyan regression and offer insights into the paleoenvironmental setting of the oldest known higher primates.
