zone fossil
Example Sentences
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In England, Kepplerites calloviensis is taken as the zone fossil; other common forms are Cosmoceras modiolare, C. gowerianum, Belemnites oweni, Ancyloceras calloviense, Nautilus calloviensis, Avicula ovalis, Gryphaea bilobata, &c.
From Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 1 "Calhoun" to "Camoens" by Various