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20p Levin LA The ecology
30a Introduction Trough and adjacent Salisbury
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abundance ammonoid analysis angiosperm anomalocarid appear areas assemblages Basin beds benthic biofacies biogeographic biological biota bivalves boundary brachiopods Burgess Shale calcareous Cambrian carbonate Caribbean Cenozoic clades climatic composition conodonts corals correlation Cretaceous crinoids Department of Geology deposits Dept Devonian distribution diversification diversity dominated early ecological Ediacaran environmental environments Eocene evidence evolution evolutionary extinction facies fauna foraminifera Formation fossil record gastropods genera Geological Sciences global groups habitats increase indicate interval isotopic late latitudes lineages lower major mammalian mammals marine Mesozoic middle Miocene morphological Museum Neogene North America occur ocean Oligocene Ordovician organic matter Paleogene Paleontology paleosols Paleozoic patterns Permian Phanerozoic phylogenetic planktonic preserved range rates reef region relative represent samples sea level sedimentary sediments sequence Shale shallow shelf shell significant Silurian Siwalik skeletal speciation species specimens stratigraphic structure suggest surface taphonomic taxa taxonomic terrestrial Triassic trilobite tropical turnover University upper vertebrate zones