Snapshots from the Tucson 2002 Gem and Mineral Show
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The Nomenclature and Major Divisions of Geologic Time
Eon Era Period Epoch MYA Age of
Phanerozoic Cenozoic Quaternary Holocene 0-2 Mammals First humans
Tertiary Neogene Pliocene 2-5
Miocene 5-24
Paleogene Oligocene 24-37
Eocene 37-58
Paleocene 58-66 Extinction of dinosaurs, ammonites
Mesozoic Cretaceous 66-144 Reptiles First flowering plants
Jurassic 144-208 First birds, mammals
Triassic 208-245 First dinosaurs
Paleozoic Permian 245-286 Amphibians Extinction of trilobites
Carboniferous Pennsylvanian 286-320 First reptiles
Mississippian 320-360 Crinoids peak, sharks radiate
Devonian 360-408 Fishes First amphibians
Silurian 408-438 First land plants, ammonites
Ordovician 438-505 Invertebrates First fish, cephalopods dominant
Cambrian 505-570 First shells, trilobites dominant
Proterozoic (Also known as Precambrian) 570-2,500 First multicelled organisms
Archean 2,500-3,800 First one-celled organisms
Hadean 3,800-4,600 Approx age of oldest rocks 3,800 MY

Index to Advertisers
AA Mineral Specimens
Alpine Minerals
Arizona Mineral Company
John Betts Fine Minerals
Lawrence H. Conklin, Mineralogist
Extinctions Fossils\
Gemart Services
Mineral of the Month Club
The Mineralogical Record Magazine
Rock of Ages
Rocks and Minerals Magazine
RockWare Earth Science Software
Simkev Micromounts
Shannon & Son's Minerals
Silver Supplies
The Sunnywood Collection
Tysons' Fine Minerals
UC Minerals
Dan Weinrich Fine Minerals
Wilensky Mineral Video
Williams Minerals Company
Wright's Rock Shop

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