General guide to the exhibition halls of the American Museum of Natural History . [34] PALAEONTOLOGY. A FOSSIL AMMONITE of 150,000,000 years ago, related to the ancestors of the common nautilus(Index Plan, p. 19, Floor IV, Hall 1) Closely connected with geology, and in-deed almost inseparable from it, is palae-ontology, or the study of ancient forms oflife. The sedimentary rocks have beenfound, on examination, to contain inmany places remains of plants or animals,which may closely resemble, but moreoften appear very different from, thosenow living on the earth. The order ofdeposition of the be
General guide to the exhibition halls of the American Museum of Natural History . [34] PALAEONTOLOGY. A FOSSIL AMMONITE of 150,000,000 years ago, related to the ancestors of the common nautilus(Index Plan, p. 19, Floor IV, Hall 1) Closely connected with geology, and in-deed almost inseparable from it, is palae-ontology, or the study of ancient forms oflife. The sedimentary rocks have beenfound, on examination, to contain inmany places remains of plants or animals,which may closely resemble, but moreoften appear very different from, thosenow living on the earth. The order ofdeposition of the beds, with the oldest atthe bottom and the youngest at the top,and the imbedded fossil forms of life,give the geologist the means of construct-ing a chronological chart, or time scale,depicting the eras, periods, epochs andformations of geologic time. There arefive eras: Archaeozoic (Primal life), Pro-terozoic (Primitive life), Palaeozoic (An-cient life), Mesozoic (Medieval life), andCenozoic (Modern life). The rocks of theArchaeozoic era have not afforded recog-nizable fossils, although the indire
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Keywords: ., bookcentury1900, bookdecade191, booksubjectnaturalhistorymuseums
