On the occurrence of Parabrograptus and Sinograptus from the Middle Ordovician of western Canada

Jackson, D.E.

Geological Magazine 103: 263-268

1966


ISSN/ISBN: 0016-7568
DOI: 10.1017/s0016756800052845
Accession: 019601731

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Abstract
Specimens of Parabrograptus and Sinograptus from western Canada are described for the first time. An amended diagnosis of Parabrograptus is given. One pyritized fragment of a sinograptid stipe exhibits characters intermediate between Holmograptus and Sinograptus.