Patterns of fossil distributions within their environmental context from the Middle Triassic in South Canyon, Central Nevada, USA

摘要: Abstract The Middle Triassic records the return of diverse marine communities after severe effects end-Permian mass extinction. This diversification leads to Mesozoic/modern adaptive radiation resulting in substantial changes comparison their Paleozoic predecessors. analysis focuses on faunal abundance, ecological patterns, and environmental interpretation a section Central Nevada. Twelve bulk samples were collected. Visible fossils identified tallied from hand thin-sections used aid interpretation. Beginning Late Anisian, we observed an ammonoid dominated flat-clam, epifaunal benthic community within muddy, quiet, inner shelf depositional environment. Through time, bivalves dominate middle environment followed by increase infaunalization shell-thickness. During this time presence oncoids reported finding corals suggest gave way higher energy patch reef edge Finally, observe brachiopods at top our deposited In sum, dominance modern taxa (i.e., bivalves) with ecologies epifaunal), Modern infaunal, thick shells) then brachiopods) overall transgressive