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Plate tectonics and biofacies evolution as factors in Ordovician correlation
Ordovician climates By N SPJELDNAES abstract only
24 other sections not shown
1'Ordovicien Appalachians Arenig argillites Armorican Ashgill assemblages Australia Baltic basal base Basin beds belt Bergstrom Berry bicornis bicornis bifidus biostratigraphical boundary brachiopods Bull Cambrian Canadian Caradoc carbonate central cephalopods Chazy Climacograptus conodonts correlation deposits Didymograptus distribution dolomite early Ordovician eastern echinoderms facies faunal change faunas faunes Formation fossils genera genus geological gracilis graptolite faunas graptolite zones graptolites Group Ibid late Ordovician limestone Llandeilo Llandovery Llanvirn Lower Ordovician marine Megafossils membranes Midcontinent Middle Ordovician Mountains Nevada Newfoundland North America northern occur Ordovician graptolite Ordovician rocks Ordoviziums ostracodes Palaeontological Palaeozoic Paleont Platform Province Quartzite region rhabdosome Ross Ruedemann sandstone Schistes sections sediments sequence Series shales shelly faunas siltstones Silurian siphuncle South southern species specimens spines spiniferus Spitsbergen Stage strata stratigraphical succession Surv symposium tectonic text-fig thecae thick Tremadoc trilobites Trough U.S. geol units Upper Ordovician volcanic Wales western Whiterock Whittington