Quesnel Lake, West Half, British Columbia

Campbell, R B

doi:10.4095/108774

Cited by 6 publications

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“…There is a notable absence of quartz, glass, and calcite. Pre-Eocene limestones crop out both east and west of the present Horsefly River (Campbell 1961). Absence of calcite from the Eocene sediments is evidence of high carbon dioxide concentrations, low oxygen concentrations, and (or) deep water deposition (Ruttner 1963).…”

Section: Conditions In the Hypolimnionmentioning

confidence: 99%

“…1) Rouse in 1959 and1961. The sediments were mapped by Campbell (1961), and have yielded a rich fauna and flora, including fishes (Wilson 1974), insects (Rice 1959(Rice , 1968Wilson, in preparation), a spider (Royal Ontario Museum 31304), palynomorphs (Rouse et at. 1971), leaves, seeds, and diatoms (Royal Ontario Museum and University of Alberta collections).…”

Section: Introductionmentioning

confidence: 99%

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Paleoecology of Eocene lacustrine varves at Horsefly, British Columbia

Wilson¹

1977

Can. J. Earth Sci.

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Middle Eocene lacu~trine sediments. cropping out in the vdley of the Horsetry River. British Columbia, contain abundant fossils of fishes. fish scales. fish coprolites, insects, leaves, and diatoms. The fish scales. insects, and leaves are preserved in at leas1 three sequences of alternating light tuff and dark sapropel laminae, separated stratigraphically by coarse-grained slnlctureless sequences. The proportions of the main types of fossils occumng in the light laminae compared with the dark laminae are significantly different, and are consistent wlth the hypothesis that the laminations are varves. with dark organic winter laminae and I~ght inorganic summer laminae. Occasional pnded sandy layen contain carbonized allochthono~is plant remains and represent turbidity deposits caused by storms in the drainage basin.1t is proposed here Ihat the varves were depos~ted in the deeper regons of a stratified, monomictic or meromictic lake in a warm temperate climate. The depositional environment was anaerobic. containtng ahundanl hydro~en sulphide, and was free of ti~rbulence and benthos. Fish we= entombed mostly during the winter, insects during the spring and summer, coprolites during the summer, and deciduous leaves duringthe late summer and autumn. The fish died of starvation and (or) overturn-induced anoxia.Les kdiments lacustres de I'Eockne rnoyen. affleuranl dans la valI6e de la riviere Horsefly. en Colomhie-Britannique. contiennent de nomhreux restes fossiles de poissons, d'ecailles de poisson. de coprolites de poissons. d'insectes, de feuilles et de diatornkes. Les ecailles de poisson, les insectes el les feuilles se sont pkserves dans au rnoins trois skquences oil altement les larnelles piiles de couleur jaunltre er fonceesde sapropel. sepo6es stratigrnphiquemenlpar des stdiments grossien sans structures. Les proponions des principaux types de fossiles qui se retrauvent dans les lamelles piles par rapport aux lamelles foncies sont sensiblernent diffkrentes et s'accordent avec I'hypothese que tes larnelles sont des varves avec des feuillets fc~nces et organiques I'hiver et d'autres plus piles et inorganiques I'eti. A I'occasion, des couches sableuses gmnoclassCes contiennent des restes vkgetaux allochthones carhonises: elks representent des dipfits de turbidite c a u g s par des o w e s dans le bassin de drainage. On propose ici que ces varves se sont dkposees dans les zones pIus profondes d'un lac stratifie rnonomictique ou memmictique en climat chaud-tempkni. Le milieu de depbt etait rtnatrohique, contenair beaucoup de sulrure d'hydrogkne et etait libre de t~~rhulence et de vie benthonique.

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Section: Conditions In the Hypolimnionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Paleoecology of Eocene lacustrine varves at Horsefly, British Columbia

Wilson¹

1977

Can. J. Earth Sci.

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“…[Traduit par le journal] volcanic rocks preserved in the Quesnel Trough (Campbell 1961 ;Campbell and Tipper 197 1). Volcanic greenstones of probable Early Jurassic age have been described by Hyndman (1968) in the Nkusp area 80km north of Rossland, suggesting a possible connection between the Rossland and Quesnel Trough volcanic series.…”

Section: Introductionmentioning

confidence: 99%

Geochemical, mineralogical, and isotopic data relating to the origin and tectonic setting of the Rossland volcanic rocks, southern British Columbia

Beddoe-Stephens¹,

Lambert²

1981

Can. J. Earth Sci.

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Bulk-rock and mineral chemical and isotopic analyses of Rossland volcanic rocks are used to infer the nature of the magma extruded in the Nelson-Rossland area of southern British Columbia during the Early Jurassic. Metamorphism of the volcanic rocks to subgreenschist and greenschist facies precludes use of mobile major and trace elements (e.g., Na, K, and Rb) as petrogenetic indicators. Data on immobile elements (Ti, Zr, and Y) and pyroxene compositions indicate that the volcanic rocks formed in a destructive-margin plate tectonic environment. Present-day 8 7~r / 8 6~r ratios range from0.70372 to 0.70480 but do not define an isochron. Corrected to Jurassic time, the initial ratios range from 0.70328 to 0.70404. Whole-rock 60'' values range from 7.9 to 11.6%, correlating inversely with metamorphic grade. Clinopyroxene 60" of 4.8-6.5 is comparable with fresh clinopyroxenes from mafic rocks of mantle origin. In view of the preponderance of basaltic rather than andesitic rock types, and because of the nature of the lithologies within the volcanic rocks and associated sediments, an island-arc setting is indicated. The appearance of primary amphibole in basaltic members of the Rossland suite, and the occurrence of ankaramitic rocks, are thought to indicate a mildly alkalic rather than a subalkalic parent magma. Comparison of the Rossland volcanic rocks with those of recent island arcs, and consideration of the Upper Triassic -Lower Jurassic paleogeography in the Cordillera, suggest the rocks may be related to a localized oceanic basin, their extrusion being associated with faults bounding its western edge.On utilise les analyses chimiques at isotopiques des roches totales et des minkraux dans les roches volcaniques de Rossland pour Ctablir la nature du magma inject6 dans la r6gion de Nelson-Rossland dans le sud de la Colombie-Britannique au cours du Jurassique inf6rieur. Le m6tamorphisme des roches volcaniques au faciks des schistes verts ou en dessous emp2che I'utilisation des 616ments majews et en traces mobiles (par exemple Na, K et Rb) cornme indicateurs de pCtrog6nkse. Les donnCes sur les ClCments immobiles (Ti, Zr et Y) et les compositions des pyroxknes indiquent que les roches volcaniques se sont formCes dans un milieu tectonique de destruction de bordures de plaques. Les rapports actuels 87Sr186Sr vont de 0,70372 a 0,70480 mais ne d6finissent pas une isochrone. Comg6s pour correspondre au Jurassique, les rapports initiaux vont de 0,70328 a 0,70404. Les valeurs de 6018 pour les roches totales vont de 7,9 a 11,6% en corrClation inverse avec le degr6 de mCtamorphisme. Le 6018du clinopyroxkne de 4,8 a 6,5 est comparable ceux des clinopyroxknes frais provenant de roches mafiques dont I'origine est dans le manteau. A cause de la prCpondCrance des types de roches basaltiques plut6t qu'andksitiques et a cause de la nature des lithologies dans les roches volcaniques et les sCdiments associCs, on suggkre un milieu d'arc insulaire. L'apparition d'amphibole primaire dans les membres basaltiques de la suite de Rossland, de ...

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Aulacomnium heterostichoides sp.nov., an Eocene moss from south central British Columbia

Janssens¹,

Horton²,

Basinger³

1979

Can. J. Bot.

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Aulacomnium heterostichoides Janssens, Horton, and Basinger is described as new from Eocene sediments located near Horsefly, B.C. It is characterized by spirally arranged, oblong leaves, which are slightly asymmetric by the unequal laminae in the lower one-third; irregularly, coarsely toothed upper margins with the teeth both multicellular and multiseriate; a strong costa, which ends near the apex; upper and basal laminal cells which are more or less isodiametric. These character states indicate a very close relationship to Aulacomnium heterostichum.Palynological studies indicate that Aulacomnium heterostichoides grew in a temperate, deciduous forest with species of Alnus, Carya, Pinns, Quercus, Taxodium, and Tilia, as well as other deciduous and coniferous trees. Extant populations of A. heterostichum commonly occur in a similar habitat along streams in the mesic, deciduous forests of eastern Asia and eastern United States.There is considerable fossil evidence which shows that vascular plants currently restricted to eastern Asia and eastern North America, occurred in the intervening areas across continental North America in Tertiary times. Our report of A. heterostichoides is the first indication, based on a fossil specimen, that bryophytes presently associated with the disjunct deciduous forests of eastern Asia and eastern North America were earlier associated with some elements of these forests in localities beyond the present range of such taxa.

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Quesnel Lake, West Half, British Columbia

Cited by 6 publications

References 0 publications

Paleoecology of Eocene lacustrine varves at Horsefly, British Columbia

Paleoecology of Eocene lacustrine varves at Horsefly, British Columbia

Geochemical, mineralogical, and isotopic data relating to the origin and tectonic setting of the Rossland volcanic rocks, southern British Columbia

Aulacomnium heterostichoides sp.nov., an Eocene moss from south central British Columbia

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