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79
79 Tail of phyllocarid crustacean Ceratiocaris acuminata, Williamsville
Formation, Ridgemount Quarries, Ontario YPM. Length of tail-spike
6 cm 2.4 in.
80
80 Orthocone nautiloid, Williamsville Formation bed A, Ridgemount
Quarries, Ontario YPM. Length 15 cm 6 in.
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