Antarctic convergence
Antarctic convergence (AAC) A convergence line in the seas that circle Antarctica between latitudes 50°S and 60°S. It is where the cold waters from the Antarctic region meet and sink beneath the warm waters from the middle latitudes, so forming the
Antarctic intermediate water. This convergence line is now called the Antarctic polar front.
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Ordovician and Silurian global geography: Presidential address, delivered 3 May 2000
Magazine article from: Journal of the Geological Society; 3/1/2001; ; 700+ words
; ...united with Avalonia by the end Ordovician and the two with Laurentia...distinctive faunas during the Ordovician, in particular those in the...Baltica to Siberia. As the period progressed, the Iapetus arcs...trilobites, which in the early Ordovician had formed a cline between...
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Middle ordovician (whiterockian) gastropods of western Newfoundland: Macluritoidea and euomphaloidea
Magazine article from: Journal of Paleontology; 3/1/2001; ; 700+ words
; ...Billings in 1865 from Middle Ordovician (Whiterockian) strata...numbers in the Cambrian Period and underwent rapid radiation during the Ordovician (see Wagner, 1995...event at the end of the Ordovician. During Whiterockian time...
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Body size, energetics, and the Ordovician restructuring of marine ecosystems
Magazine article from: Paleobiology; 7/1/2008; ; 700+ words
; ...relative abundance throughout the Ordovician, so that estimates of brachiopod...substantially between the Early and Late Ordovician. Although the data set includes...history took place during the Ordovician Period (490-443 Ma). Numerous clades...
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NEW BIVALVIA AND ROSTROCONCHIA FROM THE EARLY ORDOVICIAN (LATE TREMADOC-MIDDLE ARENIG) OF NORTHWESTERN ARGENTINA
Magazine article from: Journal of Paleontology; 5/1/2005; ; 700+ words
; ...Ucumariidae. Clearly, the Early Ordovician was a period of experimentation and radiation...morphological evolution. The Early Ordovician bivalve record includes species...SETTING AND AGE OF THE FAUNA Ordovician rocks are widely exposed in...
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Evenness of Cambrian-Ordovician benthic marine communities in North America
Magazine article from: Paleobiology; 7/1/2004; ; 700+ words
; ...preserved Cambrian and Ordovician benthic marine assemblages...from the Cambrian to the Ordovician in these assemblage data...within the Cambrian and Ordovician periods. Much of the within-period variance in evenness appears...
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Ordovician (Whiterock) calymenid and encrinurid trilobites from the Precordillera of Argentina
Magazine article from: Journal of Paleontology; 7/1/1998; ; 700+ words
; ...the cladistic analysis of Ordovician Encrinurinae by Lesperance...two instars in the protaspid period, a general pattern in Ordovician encrinurinid ontogeny. INTRODUCTION...systematics and ontogeny of Ordovician trilobites from the Precordillera...
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Dianulites Eichwald, 1829: An unusual Ordovician bryozoan with a high-magnesium calcite skeleton
Magazine article from: Journal of Paleontology; 1/1/1999; ; 700+ words
; ...Nicholsonella and a few other Ordovician genera traditionally assigned...Fillmore Formation (Lower Ordovician) of Utah. Unusually among...of subcolonies, suggesting periods of partial burial of the living...stenolaemate bryozoans are several Ordovician genera characterized by indistinct...
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Description and interpretation of Sanctum laurentiensis, new ichnogenus and ichnospecies, a domichnium mined into Late Ordovician (Cincinnatian) ramose bryozoan colonies
Magazine article from: Journal of Paleontology; 9/1/2003; ; 700+ words
; ...Cincinnatian Series (Late Ordovician) in its type area on the...made over a twenty-year period during which we have re...the expansion into the Early Ordovician (Bottjer and Droser, 1994...Erickson, 1989). By the Early Ordovician, oxygenated, detritus...
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Dolomitization of the Lower Ordovician Aguathuna Formation carbonates, Port au Port Peninsula, western Newfoundland, Canada: implications for a hydrocarbon reservoir.
Magazine article from: Canadian Journal of Earth Sciences; 7/1/2008; ; 700+ words
; ...equivalent Lower to Middle Ordovician carbonates in neighbouring...an Early to earliest Middle Ordovician wide, low-energy carbonate...1989). The passive margin period ended with onset of significant...margin in earliest Middle Ordovician (Jacobi 1981; Knight et...
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Comparative geographic and environmental diversity dynamics of gastropods and bivalves during the Ordovician Radiation
Magazine article from: Paleobiology; 10/1/2003; ; 700+ words
; ...bivalves and gastropods during the Ordovician Period at scales ranging from global...environmental distributions during the Ordovician, their environmental distributions...albeit distinct, roles in the Ordovician diversifications of gastropods...
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Ordovician Period
Book article from: World of Earth Science
Ordovician Period In geologic time , the Ordovician Period, the second period of the Paleozoic Era , covers...roughly 505 million years ago (mya) until 438 mya. The name Ordovician derives from that of the Ordovices, an ancient British...
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Ordovician period
Book article from: The Columbia Encyclopedia, Sixth Edition
Ordovician period [from the Ordovices...of North America. The Ordovician rocks are chiefly sedimentary...toward the end of the period. The close of the Ordovician...economic resources of the Ordovician strata are oil, natural...
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Ordovician
Book article from: The Oxford Companion to the Earth
...from those above and below. The Ordovician is thus the second of the three...used in correlation. During the Ordovician period the South American and African...sizes and shapes of land masses. Ordovician global sea level was initially...
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Caledonides
Book article from: The Oxford Companion to the Earth
...oceans during the Silurian period: lapetus, which separated...basins overlain by Cambro-Ordovician carbonate shelf sequences. Mid-Ordovician foreland-directed thrust...basins and Cambro– Ordovician shelf sequences with evidence...
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Silurian Period
Book article from: World of Earth Science
Silurian Period In geologic time , the...establishes that the preceding Ordovician Period ended with a mass...marked the end of the Ordovician Period and the start of...many fossils dated to the Ordovician Period are not found in...
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