Notes on the trilobite faunas of the Henson Gletscher Formation (Lower and Middle Cambrian) of central North Greenland

Abstract

Cambrian trilobite faunas collected from a 90 m section of the Henson Gletscher Formation in southern Freuchen Land are described. Nineteen species are discussed, six of which are new. Aspects of the ontogenies of two species of Ogygopsis Walcott, 1889 are outlined, and initial correlations of Ogygopsis made with North America and Siberia. The first occurrenees outside China of species assigned to Arthricocephalus Bergeron, 1889 and Changaspis Lee, 1963 are reported. Problems of ptychopariid classification for the early Cambrian are covered, and proposals for a new approach to understanding ptychopariid relationships are outlined.