Fern Ledges, Plant bed 8, Carleton, Saint John (Carboniferous of Canada)

Where: New Brunswick, Canada (45.2° N, 66.1° W: paleocoordinates 8.2° S, 8.9° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Lancaster Formation, Westphalian A (318.7 - 316.9 Ma)

• Plant fossils indicate an early Westphalian B age (Stopes, 1914; Hayes and Howell, 1937; Bell, 1944b) for the Lancaster Formation at Saint John, now thought to be mid-upper Langsettian (Falcon-Lang & Miller, 2007).

• group of beds-level stratigraphic resolution

Environment/lithology: estuary or bay; lithified shale

• Interpreted as a marsh or very shallow fresh water pond by Matthew (1894), but re-interpreted by Falcon-Lang and Miller (2007) as shoreline sediments in a brackish bay. Maritimes basin; major rift-valley system developed after the Acadian orogeny.
• In the type area, the formation consists of grey to greenish grey quartzose sandstone and dark grey, greenish grey, or black shale.

Size class: macrofossils

Preservation: mold/impression

Collected by W.J. Wilson

• Mr Wilson's collections have been made under exceptional circumstances. The beds from which Prof. Hartt had collected had been quarried to the level of the beach, and thus apparently exhausted. But Mr. Wilson, watching the beach after storms, was able to find some of the ledges bared by the action of the waves, and from these collected the objects herein described. He could work at these ledges only for a few hours when the tide was out.

Primary reference: G. F. Matthew. 1895. On the organic remains of the Little River Group, No. II. Transactions of the Royal Society of Canada 4:89-100 [M. Clapham/M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 114467: authorized by Matthew Clapham, entered by Matthew Clapham on 15.08.2011

Creative Commons license: CC BY (attribution)

Taxonomic list

Insecta
 Dicondylia -
"Homothetus erutus n. sp." = Pseudohomothetus erutus
"Homothetus erutus n. sp." = Pseudohomothetus erutus Matthew 1895 winged insect
NBMG 3013
Arachnida
 Trigonotarbida - Anthracomartidae
? Eurymartus sp. Matthew 1895
NBMG 3314