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ISBN: 978-1-897095-94-2

ISSN: 0821-7556

From the Abstract: Late Silurian and Early Devonian heterostracans representing eight orders are described from localities on Bathurst, Cornwallis, Ellesmere, Prince of Wales and Somerset islands and Boothia Peninsula in Nunavut, and also the Yukon and Northwest Territories. Much of the fauna comes from Cornwallis and Prince of Wales islands and mainly from the Cape Phillips, Peel Sound, Somerset Island and Drake Bay formations. the heterostracan faunas range in age from middle Silurian (early Wenlock) to the Early Devonian (late Lochkovian) and are mostly dated by co-occuring graptolites. They thus encompass both the earliest known heterostracans and the period of their greatest diversity.
This collection includes the oldest known heterostracans and so provides information important to phylogenetic studies. It also covers most of the history of heterostracans including the peak of diversity in the late Silurian and comes from localities that have been accurately dated.

By R. Thorsteinsson and D.K. Elliott. 348 pp., 79 Pl., 91 figs. 38 tables.
ISSN 0821‐7556
ISBN 978‐1‐897095‐94‐2
©2022 Joint Committee on Paleontological Monographs for CSPG/GAC
Softcover 348 pp., 79 pls. (2022)

PalCan40 Abstract
PalCan40 ToC