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.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
