Oxford Formation trilobites (Ordovician of Canada)

Where: Ontario, Canada (44.9° N, 75.6° W: paleocoordinates 29.0° S, 62.7° W)

• coordinate estimated from map

• local area-level geographic resolution

When: F-G2 trilobite zone, Oxford Formation (Beekmantown Group), Floian (477.7 - 470.0 Ma)

• Trilobites collected from lower sandy division of Oxford as defined by Bond and Greggs 1976 (CJES 13:19-26). Correlates with Ross/Hintze trilobites zones F, G, and/or H, and conodont Fauna D. "lower sandy division."

• member-level stratigraphic resolution

Environment/lithology: peritidal; lithified, sandy dolomite

• "[The Oxford Formation was] deposited in a high intertidal, carbonate flat environment. The wide areal distribution of algal mats, stromatolitic beds, finely laminated dolomites, and dessication cracks indicates that intertidal conditions prevailed over a large area. Lithoclast breccias, and mechanically sorted clastic and bioclastic material, indicates periodic flooding and high energy conditions by tides or storm activity." Bond and Greggs (1976, CJES 13:19-26, p. 22).
• rusty weathering arenaceous dolostone

Size class: macrofossils

Preservation: mold/impression

Collected by Billings, J. Townsend, P.E. Raymond

Primary reference: R. Ludvigsen. 1979. Lower Ordovician trilobites of the Oxford Formation, eastern Ontario. Canadian Journal of Earth Sciences 16:859-865 [M. Hopkins/M. Hopkins]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 173861: authorized by Melanie Hopkins, entered by Melanie Hopkins on 20.10.2015

Creative Commons license: CC BY (attribution)

Taxonomic list

• Oxford Formation also includes cephalopods, conodonts, and gastropods.
Show authors, comments, and common names
Trilobita
 Proetida - Bathyuridae
Bolbocephalus convexus, "Goniotelina subrectus" = Acidiphorus, Gignopeltis rarus
Bolbocephalus convexus Billings 1865 trilobite
"Goniotelina subrectus" = Acidiphorus trilobite
Gignopeltis rarus Billings 1865 trilobite
 Phacopida - Pliomeridae
Strotactinus salteri
 Asaphida - Asaphidae
Isoteloides sp.
Isoteloides sp. Raymond 1910 trilobite