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Showing 1 - 3 results of 3 for search '"Middle Ordovician"', query time: 0.21s Refine Results
  1. 1
    by Ludvigsen, Rolf
    Published 1975
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  2. 2
    by Mccracken, Alexander Duncan
    Published 1985
    “... Middle Ordovician to Early Silurian. Additional Late Ordovician conodonts are from the more nearshore...”
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  3. 3
    by Melchin, Michael Jerome
    Published 1987
    “... Hedrograptus proceeds from middle Ordovician times into the Llandovery and gives rise to the major Early...”
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