Middle Cambrian (Drumian) trilobites and agnostid arthropods from the Manuels River Formation, Avalonian New Brunswick: bracketing the green–black facies boundary

Canadian Journal of Earth Sciences, Volume 62, Issue 5, Page 962-1001, May 2025.First described by G.F. Matthew 140 years ago, the trilobites and agnostid arthropods of the Manuels River Formation of New Brunswick remain essentially unstudied in modern terms, and most species are known only from his line drawings. Across Avalonian North America, southern Britain, and Belgium, the black mudstone-dominated Manuels River Formation is a distinctive depositional sequence that unconformably overlies g