Eocene adakitic volcanism in southern British Columbia: Remelting of arc basalt above a slab window

Ickert, Ryan B.; Thorkelson, Derek J.; Marshall, Daniel D.; Ullrich, Thomas

doi:10.1016/j.tecto.2007.10.007

Cited by 68 publications

(37 citation statements)

References 89 publications

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“…3). This value is consistent with recent regional radiometric dating of Allenby Formation volcanics (Ickert et al 2009). As the Ashnola shale is stratigraphically high in the Allenby Formation (Boneham 1968;McMechan 1983;Read 2000), the Princeton chert appears to be the youngest of the Okanagan Highlands floras, as either latest Early Eocene or earliest Middle Eocene.…”

Section: The Princeton Chertsupporting

confidence: 91%

“…3). Newer 40 Ar-39 Ar and U-Pb methods of radiometric dating of associated volcanics reinforce this age by placing all Allenby Formation sites, including Thomas Ranch (Dillhoff et al 2013) and several additional key sites such as Driftwood Canyon (Eberle et al 2014) Ickert et al 2009). This new synthesis is presented here in Fig.…”

Section: Leaders In Stratigraphic Palynology: 1961-1980mentioning

confidence: 98%

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A review of paleobotanical studies of the Early Eocene Okanagan (Okanogan) Highlands floras of British Columbia, Canada, and Washington, USA

et al. 2016

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Section: The Princeton Chertsupporting

confidence: 91%

Section: Leaders In Stratigraphic Palynology: 1961-1980mentioning

confidence: 98%

A review of paleobotanical studies of the Early Eocene Okanagan (Okanogan) Highlands floras of British Columbia, Canada, and Washington, USA

et al. 2016

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“…The Princeton Basin is considered to be formed within a complex half graben, with structural features including major faults, synclines, and anticlines, indicating a complex structure that included considerable volcanic activity during its formation (McMechan 1983). The depositional low was likely a consequence of crustal extensional activity associated with the uplift of the Rocky Mountains and the underplating of rafted terranes (McMechan 1983;Ickert et al 2009). Shaw (1952) divided the Princeton Group into a Lower Volcanic Formation, the Allenby Formation, and an Upper Volcanic Formation.…”

Section: Princeton Basin: Allenby Formationmentioning

confidence: 99%

“…2). More recent 40 Ar/ 39 Ar and U-Pb dates from Allenby Formation volcanics are even older, at ϳ52 Ma (e.g., Moss et al 2005;Ickert et al 2009; summarized in Greenwood et al 2016a), with the top of the Allenby Formation likely ϳ48.7 Ma based on an unpublished date for Ash No. 22 in the Princeton Chert (Little et al 2009;Pigg and DeVore 2016).…”

Section: Princeton Basin: Allenby Formationmentioning

confidence: 99%

An Eocene brontothere and tillodonts (Mammalia) from British Columbia, and their paleoenvironments

Eberle

Greenwood

2017

Can. J. Earth Sci.

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Abstract:We describe Eocene fossils of the tillodont Trogosus from the Allenby Formation in Princeton, British Columbia (B.C.), as well as teeth of Brontotheriina from the lower Australian Creek Formation near Quesnel, B.C. These fossils represent the only occurrence of Tillodontia and Brontotheriidae in B.C. Further, the presence of the largest species of Trogosus -T. latidens -as well as a smaller species identified only as Trogosus sp. supports a late early -early middle Eocene (Bridgerian) age for the Vermilion Bluffs Shale of the Allenby Formation. Based on their morphology and large size, the teeth referred here to Brontotheriina represent one of the larger, more derived brontothere genera, and suggest a Uintan-Chadronian (middle-late Eocene) age range for the lower Australian Creek Formation that is consistent with radiometric ages of underlying volcanic rocks. Paleobotanical data from sediments correlative to those that produced these Eocene mammal fossils suggest they inhabited forested landscapes interspersed with swamps and open water environments, under mild and wet temperate climates (mean annual temperature (MAT) ϳ10-16°C; cold month mean temperature (CMMT) −4-4°C; mean annual precipitation (MAP) >100 cm/year). These mixed conifer-broadleaf forests included tree genera typical of modern eastern North American forests (e.g., Tsuga, Acer, Fagus, and Sassafras), together with genera today restricted to east Asia (e.g., Metasequoia, Cercidiphyllum, Dipteronia, and Pterocarya). The paleobotanical evidence is consistent with the hypothesized habitats of both tillodonts and brontotheres. Résumé : Nous décrivons des fossiles éocènes de tillodontes Trogosus de la Formation d'Allenby à Princeton, enColombieBritannique, ainsi que des dents de brontothériinés de la partie inférieure de la Formation d'Australian Creek, près de Quesnel (Colombie-Britannique). Ces fossiles représentent les seules présences signalées de tillodontes et de brontothériidés en Colombie-Britannique. En outre, la présence de la plus grande espèce de Trogosus, T. latidens, ainsi que d'une plus petite espèce identifiée seulement comme Trogosus sp., appuie un âge allant de la fin de l'Éocène précoce au début de l'Éocène moyen (Bridgérien) pour le shale de Vermillion Bluffs de la Formation d'Allenby. À la lumière de leur morphologie et de leur grande taille, les dents attribuées ici aux brontothériinés représentent un des genres de brontothères les plus grands et les plus dérivés et indiqueraient une fourchette d'âges allant de l'Uintien au Chadronien (Éocène moyen à tardif) pour la partie inférieure de la Formation d'Australian Creek, ce qui concorde avec les âges radiométriques de roches volcaniques sous-jacentes. Des données paléobotaniques pour des sédiments corrélés à ceux qui ont produit ces fossiles de mammifères éocènes donnent à penser que ces derniers vivaient dans des paysages boisés parsemés de marécages et de milieux d'eau libre, sous des climats tempérés doux et humides (température annuelle moyenne (TAM) ϳ10-16°C; température...

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“…The Eocene was also a time when economically important regional coal and other mineral reserves were deposited (Ewing 1981;Read 2000). During the Eocene, significant geological events, such as tectonic movements along with associated volcanism, shaped the mountain ranges, plateaus, and valleys that run parallel west of the modern Rocky Mountains, as well as the North American Cordillera as far south as Colorado (Ewing 1981;Gaylord et al 1996;Ickert et al 2009;Mix et al 2011). Many of the fossil-rich Eocene lacustrine shale and coal deposits of British Columbia and adjoining areas of the United States (Fig.…”

Section: Introductionmentioning

confidence: 99%

Eocene paleontology and geology of western North America

2016

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Western North America preserves a rich record of Eocene life and environments under globally warm climates, and represents an interval where significant coal and other minerals were deposited. The Eocene is of interest to biologists and paleontologists for its record of the appearance and rise to dominance of many plant, insect, and mammal groups now typical of the temperate forests of North America, admixed with groups now well represented in tropical areas or restricted to eastern Asia. This record is also of interest for its potential contribution to our understanding of interactions between climate, the biota, and the ecosystems they occupied, under atmospheric carbon dioxide levels much higher than today. Documentation of the Eocene in western North America offers insights into the effects of future greenhouse climates. A special symposium held at the 2014 Annual Meeting of the Geological Society of America in Vancouver, British Columbia, brought together geologists, paleontologists, and biologists with an interest in these questions. This paper introduces the special issue that includes a selection of papers drawn from that symposium as well as on related topics, spanning the Early to Late Eocene, and geographically from British Columbia to Colorado. Résumé :Un riche registre fossile de la vie et des milieux éocènes est préservé dans l'ouest de l'Amérique du Nord, qui représente un intervalle où d'importants gisements de charbon et d'autres minéraux ont été déposés dans des conditions climatiques planétaires chaudes. L'Éocène présente un intérêt pour les biologistes et les paléontologues en raison du registre qu'il conserve de l'apparition et de la montée en puissance de nombreux groupes de plantes, d'insectes et de mammifères aujourd'hui typiques des forêts tempérées de l'Amérique du Nord, coexistant avec des groupes aujourd'hui bien représentés dans les régions tropicales ou limités à l'est de l'Asie. Ce registre est aussi intéressant pour la contribution qu'il peut apporter à la compréhension des interactions entre le climat, les organismes vivants et les écosystèmes occupés par ces derniers dans des conditions de concentrations atmosphériques de dioxyde de carbone beaucoup plus élevées que les concentrations actuelles. La documentation de l'Éocène dans l'ouest de l'Amérique du Nord permet d'en apprendre davantage sur les effets de climats de serre futurs. Un symposium spécial qui s'est tenu au congrès annuel de 2014 de la Geological Society of America à Vancouver (ColombieBritannique) a réuni des géologues, paléontologues et biologistes intéressés par ces questions. L'article présente le numéro spécial qui comprend une sélection d'articles tirée de ce symposium, ainsi que des articles sur des sujets connexes, couvrant l'Éocène précoce à tardif et, sur le plan géographique, des régions allant de la Colombie-Britannique au Colorado. [Traduit par la Rédaction]

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Eocene adakitic volcanism in southern British Columbia: Remelting of arc basalt above a slab window

Cited by 68 publications

References 89 publications

A review of paleobotanical studies of the Early Eocene Okanagan (Okanogan) Highlands floras of British Columbia, Canada, and Washington, USA

A review of paleobotanical studies of the Early Eocene Okanagan (Okanogan) Highlands floras of British Columbia, Canada, and Washington, USA

An Eocene brontothere and tillodonts (Mammalia) from British Columbia, and their paleoenvironments

Eocene paleontology and geology of western North America

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