Middle and Upper Ordovician graptolites from the St. Lawrence Lowlands, Quebec, Canada
Eleven species of Middle and Upper Ordovician graptolites are described and illustrated, a lectotype is selected for Orthograptus reudemanni (Gurley) and the occurrence of eighteen other species is recorded. The specimens were collected from sections along the Becancour, Nicolet, Nicolet Sud-Ouest, and St. Francois Rivers of the St. Lawrence Lowlands, Quebec. The graptolite zonal scheme proposed by Riva for eastern North America is reviewed and adopted in the present study.