TYPE SECTION OF THE
DESCHAMBAULT LIMESTONE
(MIDDLE ORDOVICIAN)
Above: Canadian & American
geologists walking the Deschambault Limestone type section (Middle Ordovician),
looking for fossils. The Deschambault Limestone is the basal unit of the
Trenton Group in the Quebec City area.
Above: current-aligned orthoconic
nautiloid cephalopods in the Deschambault Limestone.