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1“...The Middle Ordovician Simpson Group of southern Oklahoma consists of an exceptionally continuous...”
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3by Stouge, Svend“... (Middle Ordovician) overlies the Lower Ordovician St. George Group. The Table Head strata are overlain...”
Published 1980
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4“... the Middle Ordovician Long Point Group of western Newfoundland. The massive sponge has a three dimensional...”
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5Middle Ordovician (Whiterockian) gastropods of western Newfoundland: Macluritoidea and Euomphaloidea“... described by E. Billings in 1865 from Middle Ordovician (Whiterockian) strata of Newfoundland are revised...”
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6“...Two occurrences of Middle Ordovician opercula belonging to the gastropod Maclurites are described...”
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8MIDDLE ORDOVICIAN (WHITEROCKIAN) GASTROPODS OF WESTERN NEWFOUNDLAND: MACLURITOIDEA AND EUOMPHALOIDEAGet access
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10by Stenzel, Sheila Rae“... Middle Ordovician time. Preceding passive margin platform growth was abruptly terminated by widespread...”
Published 1991
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14by Hunter, David Roy“...On New World Island, north central Newfoundland, the Middle Ordovician Cobbs Arm Formation...”
Published 1978
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15by Paquette, Jeanne, Stearn, Colin W., Klappa, Colin F.Get access
Published in Canadian Journal of Earth Sciences (1983)
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18“..., spicule form in these Middle Ordovician specimens is similar overall to previously known assemblages...”
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19“...In the South Nahanni River area of the District of Mackenzie, the Middle Ordovician Sunblood...”
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20by Klappa, Colin F., Opalinski, Paul R., James, Noel P.“...Lithostratigraphic nomenclature of early Middle Ordovician strata from western Newfound land...”
Published in Canadian Journal of Earth Sciences (1980)
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