R4 (Ordovician of the United States)

Where: New York (44.8° N, 73.4° W: paleocoordinates 28.6° S, 56.3° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Crown Point? Formation (Chazy Group), Whiterockian (470.0 - 457.3 Ma)

Environment/lithology: lithified grainstone

Size classes: macrofossils, mesofossils

Reposited in the NYSM

Primary reference: F.C. Shaw. 1968. Early Middle Ordovician (Chazy) trilobites of New York. New York State Museum and Science Service Memoir 17:1-163 [P. Wagner/P. Wagner]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 103282: authorized by Melanie Hopkins, entered by Melanie Hopkins on 25.01.2011

Creative Commons license: CC BY (attribution)

Taxonomic list

Trilobita
 Phacopida - Cheiruridae
Sphaerexochus valcourensis Shaw and Bolton 2011 trilobite