General guide to the exhibition halls of the American Museum of Natural History . FOSSIL BRACHIOPODS OF THE SILURIANAGE. Primitive shelled creatures somewhat re-sembling clams externally but not related tothem A FOSSIL INVERTEBRATE OF ANCIENT SEAS. (Below) A well-preserved crinoid, or sea- lilv. a flower like animal related to modern star-fishes I J til. basal period of the Palaeozoic era, theCambrian, well-preserved fossils indicatethat all of the various classes of inverte-brate life were in existence, but not soabundant and varied as in later earliest known forms of vertebrateli
General guide to the exhibition halls of the American Museum of Natural History . FOSSIL BRACHIOPODS OF THE SILURIANAGE. Primitive shelled creatures somewhat re-sembling clams externally but not related tothem A FOSSIL INVERTEBRATE OF ANCIENT SEAS. (Below) A well-preserved crinoid, or sea- lilv. a flower like animal related to modern star-fishes I J til. basal period of the Palaeozoic era, theCambrian, well-preserved fossils indicatethat all of the various classes of inverte-brate life were in existence, but not soabundant and varied as in later earliest known forms of vertebratelife are the fossil fishes from the upperOrdovician rocks of Colorado. FOSSIL INVERTEBRATESAs installed in the Hall of Geology andInvertebrate Palaeontology the exhibitsof fossil invertebrates occupy alcoves oneither side of the hall. The specimens inthe cases on the left are arranged to illus-trate historical geology, beginning at theentrance with the Pre-Cambrian rocksand advancing regularly through theCambrian, Ordovician, Silurian, Devo-nian, Mississippian, Pennsylvanian, Tri-assic, Jurassic, Cretaceous, Eocene, Oligo-cene, Miocene, Pliocene, and Pleistoceneperiods of geologic time. Most of thespecimens on exhibition are from Ameri- TRILOBITES (below) flourished in Devonian seas and became extinct millions of years ago. Perhaps related to the a
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Keywords: ., bookcentury1900, bookdecade191, booksubjectnaturalhistorymuseums
