THE ORDOVICIAN TRILOBITE CERAURINUS BARTON

The type locality of the Ordovician cheirurinid trilobite Ceraurinus marginatus Barton, the type species of Ceraurinus Barton, is probably within the Edenian Cobourg Formation of southern Ontario and not, as previously thought, in Richmondian strata of Manitoulin Island. This species has previously been known only from its cephalon and thorax. The discovery of pygidia and a nearly complete exoskeleton of C. marginatus permit a more complete diagnosis of the species and suggests that Remipyga Whittington is a junior synonym of Ceraurinus. In North America, Ceraurinus extends from the Kirkfieldian/Shermanian to the Richmondian (mid-Caradocian to Ashgillian) and is further represented by Ceraurinus glaber (Whittington), C. platycanthus Bradley, C. daedalus Cox, and C. icarus (Billings).

[1]  B. Chatterton,et al.  Silicified Middle Ordovician Trilobites from the South Nahanni River Area, District of Mackenzie, Canada , 1976 .

[2]  R. Ludvigsen.  Ordovician Formations and Faunas, Southern Mackenzie Mountains , 1975 .

[3]  H. P. Trettin.  Investigations of Lower Paleozoic Geology, Foxe Basin, northeastern Melville Peninsula, and parts of northwestern and Central Baffin Island , 1975 .

[4]  H. W. Shimer,et al.  Index Fossils of North America , 1972 .

[5]  R. W. Macomber.  Articulate brachiopods from the upper Bighorn Formation (late Ordovician) of Wyoming , 1970 .

[6]  H. B. Whittington.  Phylogeny and distribution of Ordovician trilobites , 1966 .

[7]  R. Tripp.  I.—Trilobites from the confinis Flags (Ordovician) of the Girvan District, Ayrshire. , 1962, Transactions of the Royal Society of Edinburgh.

[8]  D. Fisher.  Correlation of the Ordovician rocks in New York State , 1962 .

[9]  T. Bolton.  Catalogue of type invertebrate fossils of the Geological Survey of Canada , 1960 .

[10]  G. Sinclair.  Middle Ordovician beds in the Saguenay Valley, Quebec , 1953 .

[11]  H. B. Whittington,et al.  Silicified Middle Ordovician trilobites , 1953 .

[12]  B. N. Cooper.  Trilobites from the Lower Champlainian Formations of the Appalachian Valley , 1953 .

[13]  G. M. Kay.  Stratigraphy of the Trenton group , 1937 .

[14]  I. Cox.  Richmondian Trilobites from Akpatok Island , 1933, Geological Magazine.

[15]  G. A. Cooper,et al.  Upper Ordovician and Lower Devonian stratigraphy and paleontology of Perce, Quebec; Part II (cont.) , 1930 .

[16]  A. F. Foerste.  Upper Ordovician faunas of Ontario and Quebec , 1924 .

[17]  O. Farrington,et al.  New trilobites from the Maquoketa beds of Fayette county, Iowa / , 1913 .