On the Magog, Quebec, graptolites

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ID: 301171
1962
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Abstract
Restudy of graptolite assemblages from the classic Castle Brook locality near Magog reveals that 2 graptolite zones, those of Climacograptus bicornis and Orthograptus truncatus var. intermedius, are present there. These zones indicate a late Middle Ordovician (Wilderness and Trenton) age for the rocks comprising them. If the graptolite-bearing slates are included in the Beauceville Group, the lower part of that unit is, therefore, Wilderness and Trenton in age. The graptolite-bearing rocks near Magog and the Normanskill Formation may be correlated because the same 2 graptolite zones are present in both units. The Magog graptolite-bearing strata are thus not younger than the Normanskill Formation, as has long been thought, and the graptolite fauna of the Magog rocks does not belong in a zone distinct from those in the Normanskill Formation.
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Authors William B. N. Berry
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Journal american journal of science
Year 1962
DOI
10.2475/ajs.260.2.142
URL
https://ajs.scholasticahq.com/article/58906.pdf
Keywords Keywords not found

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