Stratigraphic Revisions and Carbonate Sedimentology of the Kunga Group [Upper Triassic - Lower Jurassic], Queen Charlotte Islands, British Columbia

Depositional response to the Late Triassic ascent of calcareous plankton in pelagic mid-oceanic plate deposits of Japan

“…Accumulation of thin-shelled bivalves of Middle-Upper Triassic age are known in several places. These include the carbonate platform of Sicily, Italy (Bellanca et al, 1995), Oman (Hauser et al, 2001), South China (Enos et al, 1998), Timor (Martini et al, 2000), and British Columbia (Carlisle and Susuki, 1974;Desrochers and Orchard, 1991), and from the lower Norian deep-water radiolarian chert of the Mino-Tamba-Ashio terrane in central Japan (Kosaka and Ishiga, 1996;Sano and Kojima, 2000). Considering the wide distribution of thin-shelled bivalves from Tethyan platform carbonate to the Panthalassan deep-water radiolarian chert, we infer that they had a planktonic mode of life during their larval or adult stages and accumulated in an openocean realm as the Panthalassa Ocean.…”

The utility of the Upper Triassic conodont Primatella in Tethyan-Panthalassan correlation around the Carnian-Norian boundary

“…The Upper Triassic conodont succession in Haida Gwaii was first summarized by Orchard (1991b) and later by Carter and Orchard (2013), who focussed on integrating the conodont and radiolarian successions around the CNB. These faunas occur in the Peril Formation, which mainly consists of thinly bedded siliceous dark gray to black limestone (Desrochers and Orchard, 1991) that accumulated on an intraoceanic carbonate platform built on a remnant volcanic arc. The Peril Formation carries a wholly pelagic fauna that implies deposition in deep water under low oxygen conditions.…”

The asynchronous disappearance of conodonts: New constraints from Triassic-Jurassic boundary sections in the Tethys and Panthalassa

“…The Sandilands Formation consists of organic-rich, dark grey to black shale and siltstone with fine-to medium-grained sandstone interbeds. It was deposited in deep marine outer shelf to basinal environments (Desrochers and Orchard, 1991).…”