NH-Sears Collection - Nahant (Cambrian of the United States)

Where: Massachusetts (42.4° N, 70.9° W: paleocoordinates 68.7° S, 64.1° W)

• coordinate based on political unit

• outcrop-level geographic resolution

When: Camenella baltica trilobite zone, Middle Member (Weymouth Formation), Atdabanian (521.0 - 516.0 Ma)

• Camenella baltica zone

• bed-level stratigraphic resolution

Environment/lithology: lithified wackestone

• lime mudstone to fossil wackestone, thin (102cm) bedded, weathiering into 10 cm beds, light greenish to light green (epidotized); weather white, locally a cryptalgalaminate

Size class: macrofossils

Primary reference: E. Landing. 1988. Lower Cambrian of eastern Massachusetts: stratigraphy and small shelly fossils. Journal of Paleontology 62(5):661-695 [P. Wagner/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 56835: authorized by Pete Wagner, entered by Pete Wagner on 26.11.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

Orthothecimorpha
 Circothecida -
Hyolitha
 Hyolithida - Hyolithidae
 Orthothecida - Allathecidae
 Orthothecida - Gracilithecidae
Helcionelloida
 Helcionellida - Stenothecidae
""Ginella" acutacosta" = Stenotheca acutacosta
""Ginella" acutacosta" = Stenotheca acutacosta Walcott 1890