This monograph describes early Ordovician (Ibexian:Tremadocian
early Floian) trilobites from Northern Spitsbergen from the section
through the Kirtonryggen Formation adjacent to Hinlopen Strait. The
Formation is divided into three Members, each with distinct
trilobites collectively representing the fullest known succession
from the Bathyurid biofacies of the eastern Laurentian carbonate
platform. Previous research on the Ordovician of Spitsbergen is
summarised and correlations with similar faunas previously
described from Canada, Greenland, western Newfoundland, Vermont New
York State, Oklahoma and Missouri are discussed. Taxonomic problems
are discussed in detail leading to the recognition of 53 species,
of which 15 are new, belonging to 31 genera including four new.
Twenty-four taxa are described under open or tentative
nomenclature. The lower Member yields the earliest known
occurrences of the Illaenoidea, Proetoidea and Scutelluoidea,
supporting the hypotheses relating the origin of new major clades
to inshore habitats.
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