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Full-Text Articles in Geological Engineering
New Genera And Species Of Myripristid Fishes, In The Gulf Coast Cenozoic, Known From Otoliths (Pisces, Beryciformes)
School of Mines and Metallurgy Bulletins
Studies of fossil and Recent otoliths (sagittae) supply an important line of evidence, bearing on classification of teleost fishes, supplementary to that of anatomy, osteology, and "phylogenetic" paleoichthyology.
Squirrelfishes ( " Holocentridae" of authors) are generalized forms in which evolutionary divergence of some mag nitude is reflected in unpreservable details of anatomy, inconspicuous skeletal structures, and striking differentiation of the sagittae. Otoliths show the holocentroid complex to consist of one homogeneous unit (l\fyripristidae, elevated) and another more heterogeneous group (Holocentridae, restricted). These lineages have been separate. at least since the middle Eocene.
A revised classification, based on available lines of …
Crustacean Gastroliths From The Jackson Eocene Of Louisiana
Crustacean Gastroliths From The Jackson Eocene Of Louisiana
School of Mines and Metallurgy Bulletins
Wechesia louisianae, n. sp., is described from upper Eocene beds at Montgomery, Louisiana. Second species of the genus, it extends the range of Wechesia Frizzell and Exline from Claiborne (middle) Eocene and validates the generic diagnosis.
Spilitic Rocks And Mineral Deposits
Spilitic Rocks And Mineral Deposits
School of Mines and Metallurgy Bulletins
The principal results of research work on spilitic rocks and mineral deposits carried on since 1945 are briefly summarized. Emphasis is placed on the influence of the results on the theories of rock and ore genesis, particularly the change of "philosophy of exploration" based on the existence of hydromagmatic ore deposition. A re-classification of magmatic mineral deposits is offered.