Geology . Fig. 433.—Eocene Foramixifera: a. Xodosaria baciUum Defrance; b, X. communis(dOrbigny); c, Anomalina ammonoides (Reuss); d, Cristellaria gibba dOrbigny;e, C. radiata (Bornemann); /, g, and h, Globigerina bulloides dOrbigny; i, Vagina-Una legumen (Linne); j, Discorbina turbo (dOrbigny): k, Truncatulina lobatula(Walker and Jacob); I, Textularia subangulata dOrbigny. Magnified 10 to 50times. (Maryland Geological Survey.) of the later history, but they do not record any further profound bio-logical transformations. They stand in striking contrast with the radicaland rapid evolution of th
Geology . Fig. 433.—Eocene Foramixifera: a. Xodosaria baciUum Defrance; b, X. communis(dOrbigny); c, Anomalina ammonoides (Reuss); d, Cristellaria gibba dOrbigny;e, C. radiata (Bornemann); /, g, and h, Globigerina bulloides dOrbigny; i, Vagina-Una legumen (Linne); j, Discorbina turbo (dOrbigny): k, Truncatulina lobatula(Walker and Jacob); I, Textularia subangulata dOrbigny. Magnified 10 to 50times. (Maryland Geological Survey.) of the later history, but they do not record any further profound bio-logical transformations. They stand in striking contrast with the radicaland rapid evolution of the placental mammalians. Geologically, the most striking feature of the marine Eocene lifewas the extraordinary abundance and size of the foraminifers. Mas-sive beds of limestone in the Paris basin were largely made up of thetests of Mitiola. Other Eocene limestones were formed chiefly of Or-bitolites, Orbitoides, Operculina, and Alveolina, while the nummulitic lime-stone, whose wide range and great impor
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