U-Pb zircon dates from North American and British Avalonia bracket the Lower–Middle Cambrian boundary interval, with evaluation of the Miaolingian Series as a global unit

• Published in: Geological Magazine
• Main Authors: Landing, Ed, Schmitz, Mark D., Westrop, Stephen R., Geyer, Gerd
• Format: Article in Journal/Newspaper
• Language: English
• Published: Cambridge University Press (CUP) 2023
• Subjects: Geology; Breton Island; Newfoundland
• Online Access: http://dx.doi.org/10.1017/s0016756823000729; https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0016756823000729

Abstract High-precision U-Pb zircon ages on SE Newfoundland tuffs now bracket the Avalonian Lower–Middle Cambrian boundary. Upper Lower Cambrian Brigus Formation tuffs yield depositional ages of 507.91 ± 0.07 Ma ( Callavia broeggeri Zone) and 507.67 ± 0.08 Ma and 507.21 ± 0.13 Ma ( Morocconus-Condyl...