The Acadian Triassic

Powers, Sidney

doi:10.1086/622327

Cited by 9 publications

(9 citation statements)

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“…The next major contribution of significance was the study of the "Acadian Triassic" in Nova Scotia and New Brunswick by Sidney Powers, which resulted in a doctoral dissertation at Harvard University (Powers 1915(Powers , 1916. Based on his own extensive fieldwork and careful review of earlier studies, Powers laid the foundation for all subsequent research.…”

Section: [Traduit Par La Redaction]mentioning

confidence: 99%

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Stratigraphic and temporal context and faunal diversity of Permian-Jurassic continental tetrapod assemblages from the Fundy rift basin, eastern Canada

Sues

Olsen

2015

atgeol

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The Fundy basin in Nova Scotia and New Brunswick is the largest exposed rift basin of the Newark Supergroup and also extends beneath the Bay of Fundy. Its strata can be divided into four tectonostratigraphic sequences (TS). TS I is represented by the probably Permian Honeycomb Point Formation and possibly the Lepreau Formation. TS II includes the Wolfville Formation with the probably Middle Triassic Economy Member and the early Late Triassic Evangeline Member. These members have yielded markedly different assemblages of continental tetrapods. TS III comprises most of the Blomidon Formation, which is Norian to Rhaetian in age. The Blomidon Formation has yielded few skeletal remains of tetrapods to date but many tetrapod tracks. TS IV includes the late Rhaetian top of the Blomidon Formation and the McCoy Brook Formation, which overlies the North Mountain Basalt and is latest Rhaetian and earliest Jurassic (Hettangian) in age. The McCoy Brook Formation has yielded a diversity of continental tetrapods and lacks any of the characteristic Late Triassic forms. Recent work has correlated the Global Boundary Stratotype Section and Point (GSSP) for the base of the Jurassic (Hettangian) to a level well above the North Mountain Basalt. Thus most of the tetrapod fossils from the McCoy Brook Formation are latest Rhaetian in age, but the higher horizon with skeletal remains of sauropodomorph dinosaurs may be earliest Hettangian in age. The Fundy basin preserves the only known, stratigraphically tightly constrained record of the profound biotic changes in continental ecosystems across the Triassic-Jurassic transition.

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Section: [Traduit Par La Redaction]mentioning

confidence: 99%

“…McHone (2011) considered it a separate basin, and thus it will not be discussed further in the present paper. Powers (1915Powers ( , 1916 established an outline of the stratigraphy of the Fundy basin ( Fig. 3) based on extensive fieldwork and review of older literature.…”

Section: [Traduit Par La Redaction]mentioning

confidence: 99%

Stratigraphic and temporal context and faunal diversity of Permian-Jurassic continental tetrapod assemblages from the Fundy rift basin, eastern Canada

Sues

Olsen

2015

atgeol

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“…Manuscript received October 10, 1967. 8 The profiles (Figures 1 and 2) show that the bay is floored by the gently dipping Triassic sedimentary rocks of the Acadian Triassic Basin (Powers, 1916). The regular, well-defined, and continuous stratification of this unit suggests that the lithosome's in question are identical with, or related to, Klein's (1961Klein's ( , 1962 lacustrine Scots Bay and Blomidon Formations.…”

Section: Bedrock Geologymentioning

confidence: 94%

Bay of Fundy: Reconnaissance by Sub- Bottom Profiler

Swift

Lyall

1967

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“…Several smaller folds are associated with this structure. The synclinal axis of the major fold is seen a few metres west of a fault (unexposed) which separates the Carboniferous from downfaulted Triassic sediments of the Quaco Formation (Powers, 1916). The joint pattern in the rocks of this area has been the subject of recent study (Lajtai and Stringer 1981 of physical diagenetic processes, related to post-depositional compaction, dewatering and liquefaction (Plint and Poll 1982).…”

Section: Structure Foldingmentioning

confidence: 99%

Alluvial fan and piedmont sedimentation in the Tynemouth Creek Formation (Lower Pennsylvanian) of Southern New Brunswick

Plint

Poll

1982

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The Tynemouth Creek Formation (formerly the Tynemouth Creek and McCoy Head Formation) is redefined and detailed stratigraphic and structural sections through representative parts of the formation are presented. The Tynemouth Creek Formation is of Lower Pennsylvanian age and is at least 800 m thick. It is dominantly clastic, shows an overall upward-coarsening from siltstones and sandstones into conglomerates and was deposited in an alluvial fan and piedmont setting. Six sedimentary facies are recognized. (1) Coarse, polymict, clast-supported conglomerates dominate the upper part of the formation.(2) Tabular and channelized pebbly sandstones, up to 8 m thick represent braided channels, the former characterized by unstable banks and laterally migrating channels while the latter may have formed on the upper fan when periodic tectonic movement caused rejuvenation of the streams and resultant channel incision. (3) Erosive-based sandstones up to 30 m thick occur near the base of the formation and are interpreted as point-har deposits of large meandering rivers that existed on the floor of the basin beyond the alluvial fan toe. (4) Thin-bedded sandstones and siltstones were deposited on the banks and in abandoned channels of rivers which locally supported dense growths of CaZamiteA.(5) Red siltstones and sheet sandstones were laid down in interchannel and distal fan areas, the former by low-energy flooding and perhaps wind action; the latter by sheet floods. Paleosols and calcitic nodules are characteristic of this facies. (6) In areas starved of clastic sediment, shallow lakes occasionally formed and accumulated thin bioclastic (ostracode/gastropod/spirorbid) or algal limestones. Palaeocurrents are unimodal with a mean flow towards the north-west. The Tynemouth Creek Formation probably represents a sector of a large alluvial fan that built northward from the southern, fault-bounded margin of the Cumberland Basin. The upward-coarsening of the sequence may record continued tectonic rejuvenation of the source area, causing fan progradation and deposition of coarse, fan-head conglomerates over finer, lower fan sediments. A climate of alternating wet and (?hot) dry seasons is inferred from the sedimentary evidence as a whole. Un groupement unimodal des paleocourants est note, avec un vecteur moyen vers le nord-ouest. La formation de Tynemouth Creek correspond probablement a la portion d'un grand cone de dejection qui s'est edifie en direction nord, a partir de la bordure faillee du Bassin de Cumberland. La granulometrie croissante de la sequence correspond peut etre a un rajeunissement tectonique continuel de la region source, accompagne de la progression du cone ainsi que de la deposition de conglomerats grossiers du cone superieur sur les sediments plus fins de la partie inferieure du cone. Un climat marque par l'alternance entre saison humide et saison seche (chaude?) est deduit a partir des donnees sedimentologiques.

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The Acadian Triassic

Cited by 9 publications

References 0 publications

Stratigraphic and temporal context and faunal diversity of Permian-Jurassic continental tetrapod assemblages from the Fundy rift basin, eastern Canada

Stratigraphic and temporal context and faunal diversity of Permian-Jurassic continental tetrapod assemblages from the Fundy rift basin, eastern Canada

Bay of Fundy: Reconnaissance by Sub- Bottom Profiler

Alluvial fan and piedmont sedimentation in the Tynemouth Creek Formation (Lower Pennsylvanian) of Southern New Brunswick

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