Geology and paleobiology of islands in the Ordovician Iapetus Ocean: Review and implications

A Review of Proterozoic to Early Paleozoic Lithotectonic Terranes in New Brunswick, Canada and their Tectonic Evolution during Penobscot, Taconic, Salinic and Acadian Orogenesis

“…This unconformity postdates deformation that transformed the Patrick Brook beds into a broken formation, suggesting a relationship to Penobscot orogenesis (Fig. 5) (Neuman 1968(Neuman , 1971(Neuman , 1984Fyffe 1976;Nowlan 1981;Fyffe et al 1997;Poole and Neuman 2003;Downey et al 2006).…”

“…2) is characterized by a Cambrian to Lower Ordovician (Tremadocian) quartzose sedimentary sequence of the Miramichi Group, and unconformably to conformably overlying Middle to Upper Ordovician (Dapingian to Sandbian) bimodal volcanic rocks of the Bathurst Supergroup (Helmstaedt 1971;Fyffe 1976Fyffe , 1982Whitehead and Goodfellow 1978;Neuman 1984;van Staal 1987;Fyffe 1991, 1995;van Staal et al , 2003Fyffe et al 1997). The Miramichi Group is divided into a lower unit of thick-bedded quartzose sandstone of the Chain of Rocks Formation; a middle unit of medium-bedded quartzose sandstone, siltstone, and shale of the Knights Brook Formation; and an upper unit of medium-bedded, feldspathic sandstone and shale of the Patrick Brook Formation (Fig.…”

“…Fyffe (1976Fyffe ( , 1982 documented a Penobscot unconformity between volcanic rocks of the Middle to Upper Ordovician Tetagouche Group and underlying sedimentary rocks of the Cambrian to Lower Ordovician Miramichi Group in the Miramichi terrane of northeastern New Brunswick. Calcareous beds immediately above the Penobscot unconformity contain a distinctive Celtic brachiopod fauna in Maine, New Brunswick, and Newfoundland (Neuman 1964(Neuman , 1968(Neuman , 1984Wonderley and Neuman 1984;O'Neill and Knight 1988;Poole and Neuman 2003).…”

Comment on “Tectonic history of the Lunksoos Composite Terrane in the main Appalachians” by M. Reid Wellensiek, Ben A. van der Pluijm, Rob Van der Voo, and Rex J. E. Johnson;

“…the only one that preserves a non-North American Early Ordovician fauna, the Celtic brachiopod assemblage of the Shin Brook Formation [Neuman, 1984]. The Miramichi anticlinorium that extends across New Brunswick to the east also has Lower Ordovician fossiliferous rocks that contain such a fauna, but none of these is known to occur in Maine in the southwestern end of this anticlinorium.…”

“…The Miramichi anticlinorium that extends across New Brunswick to the east also has Lower Ordovician fossiliferous rocks that contain such a fauna, but none of these is known to occur in Maine in the southwestern end of this anticlinorium. The few identifiable Ordovician shelly fossils elsewhere in northern Maine are all younger than those of the Shin Brook Formation, and they are assemblages of "Scoto-Appalachian" provincial affinities [Neuman, 1984]. …”