ammonites
LaSalle Limestone Member, Bond Fm., near Pontiac, Livingstone County, IL (Carboniferous of the United States)

Where: Livingston County County, Illinois (40.8° N, 88.7° W: paleocoordinates 3.7° S, 22.7° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: LaSalle Limestone Member (Bond Formation), Missourian (305.9 - 303.4 Ma)

• member-level stratigraphic resolution

Environment/lithology: marine; gray, blue shale and limestone

• the shale deposits are interpreted as quiet water environments without perceptible wave or curent actions
• Crinoids were found embedded in a depression (a shaley pocket) filled with blue-gray marine shale, 4.5 ft. in depth; the secondary lithology, limestone, is about 12.5 ft thick and underlies the shaley pockets

Size class: macrofossils

Collection methods: bulk,

• All specimens reposited in the Illinois Geological Survey, Urbana, Illinois

Primary reference: H. L. Strimple and R. C. Moore. 1971. Crinoids of the LaSalle Limestone (Pennsylvanian) of Illinois. University of Kansas Paleontological Contributions (55)5-48 [J. Alroy/D. Lamb/D. Lamb] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 51191: authorized by John Alroy, entered by David Lamb on 31.05.2005, edited by Loic Villier and Uta Merkel

Creative Commons license: CC BY-NC-ND (attribution-noncommercial-no derivatives)