Where: Arkansas (35.0° N, 93.0° W: paleocoordinates 21.9° S, 89.9° W)

• coordinate estimated from map

• local area-level geographic resolution

When: Unit 4 Member (Collier Shale Formation), Franconian (497.0 - 485.4 Ma)

• Subseries listed as Middle to Upper Cambrian. Trilobite article with other classes mentioned; Elvinia and Taenicephalus zones

• formation-level stratigraphic resolution

Environment/lithology: offshore shelf; poorly lithified, lenticular, calcareous shale and lithified, pyritic, peloidal limestone

Size classes: macrofossils, mesofossils

Primary reference: W. D. Hart, J.H. Stitt, S.R. Hohensee and R.L. Ethington. 1987. Geological implications of Late Cambrian trilobites from the Collier Shale, Jessieville area, Arkansas. Geology 15:447-450 [P. Novack-Gottshall/P. Hearn]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 77107: authorized by Phil Novack-Gottshall, entered by Paul Hearn on 20.12.2007

Creative Commons license: CC BY (attribution)