Palynology of the Eocene Kitsilano Formation, southwest British Columbia

1969 ◽  
Vol 47 (7) ◽  
pp. 1101-1131 ◽  
Author(s):  
William S. Hopkins Jr.
Keyword(s):  
British Columbia ◽  
Late Eocene ◽  
Temperate Climate ◽  
Early Oligocene ◽  
Study Support ◽  
Plant Microfossils ◽  
Warm Temperate

Approximately 55 genera and 75 species of plant microfossils are illustrated and described from the Kitsilano Formation of southwestern British Columbia. The general composition of the flora suggests a humid, warm temperate climate prevailed at time of deposition. Previous work on plant megafossils indicates a late Eocene to possibly early Oligocene age. Plant microfossils recovered in this study support a probable middle to late Eocene age for the Kitsilano Formation.

Palynology and geochronology of Eocene beds from Cheslatta Falls and Nazko areas, central British Columbia

1988 ◽  
Vol 25 (8) ◽  
pp. 1268-1276 ◽  
Author(s):  
G. E. Rouse ◽  
W. H. Mathews
Keyword(s):  
British Columbia ◽  
Middle Eocene ◽  
Late Eocene ◽  
Early Oligocene ◽  
Early Tertiary ◽  
International Boundary ◽  
Climatic Cooling ◽  
Warm Temperate ◽  
Subtropical Environment

Early Tertiary lavas and sediments were collected from two areas west and south of Prince George, British Columbia, and processed for K/Ar dating and palynoassemblages.Samples from Cheslatta Falls gave K/Ar dates of 36.5 and 37.7 Ma and yielded a palynoassemblage very similar to that from the Jackson Group in Alabama and Mississippi. This Late Eocene assemblage is interpreted as having developed in a humid subtropical environment, prior to a climatic cooling that, we believe, should be assigned to Early Oligocene time.The Tertiary lavas and sediments from the Nazko area, west of Quesnel, gave three Middle Eocene dates and over 60 species of palynomorphs. These correlate with other rocks and palynoassemblages of Kamloops Group equivalents that occur southward across the International Boundary and north to latitude 55°N. The paleoclimate was wet and in the range of very warm temperate to humid subtropical.

Age and depositional environment of the Rock River coal basin, Yukon Territory, Canada

1994 ◽  
Vol 31 (5) ◽  
pp. 865-880 ◽  
Author(s):  
D. G. F. Long ◽  
A. R. Sweet
Keyword(s):  
Depositional Environment ◽  
Middle Eocene ◽  
Late Eocene ◽  
Yukon Territory ◽  
Temperate Climate ◽  
Fluvial System ◽  
Coal Basin ◽  
Early Oligocene ◽  
Palynological Assemblage ◽  
Latest Eocene

Poorly exposed Late Eocene strata in the Rock River basin, 115 km northeast of Watson Lake, accumulated in an intermontane valley with a geometry and history controlled by subsidence associated with the Rock River Fault. The sequence, as seen in one outcrop and five borehole sections, is dominated by drab mudrocks with minor sandstones and some thick lenses of coal. The mudrocks accumulated in floodplain marsh and pond settings associated with a low-gradient, possibly anastomosed, fluvial system. River banks were stable owing to the abundance of plant roots in the channel walls. Although channel sandstone and conglomerate were not identified in the core, the abundance of coarsening- and fining-upwards sets of sandstone of splay origin indicates pronounced levee development. Woody coals accumulated in areas well away from the main channel, in a series of elongate forested swamps, which were periodically inundated by flood water.The overall palynological assemblage is typical of the Eocene and Early Oligocene. A Late Eocene age is inferred from the presence of Gothanipollis in combination with the absence of index species for the Early–Middle Eocene and the latest? Eocene and Oligocene. The low miospore diversity indicates a temperate climate. The dominance of the palynological assemblage by Taxodiaceae–Cupressaceae pollen indicates wet–humid conditions.

Estimating the timescale of Lobaria diversification

2018 ◽  
Vol 50 (1) ◽  
pp. 113-121 ◽  
Author(s):  
Carolina CORNEJO ◽  
Christoph SCHEIDEGGER
Keyword(s):  
Current Distribution ◽  
Strong Support ◽  
Arctic Climate ◽  
Temperate Climate ◽  
Bering Strait ◽  
Land Bridge ◽  
Early Oligocene ◽  
Bering Land Bridge ◽  
Warm Temperate ◽  
Major Highway

AbstractUsing an ITS mutation rate as calibration reference, a three-locus timetree was generated for the genus Lobaria and its most important clades. The timetree resolved most clades with strong support and gave an estimate of the diversification time for Lobaria during the early Oligocene. A fossil impression from a 12–24 million-year-old Miocene deposit is hypothesized here to belong to an ancestral Lobaria species. Additionally, the age estimate indicates that the paleoclimate and the closing or opening of the Bering Strait played a major role in shaping the current distribution of most Lobaria species. It is hypothesized that the Bering land bridge acted as a major highway during warm-temperate climate periods, but as a barrier during Arctic climate times.

Palynology of Oligocene sediments from central British Columbia

1971 ◽  
Vol 49 (11) ◽  
pp. 1885-1920 ◽  
Author(s):  
K. M. Piel
Keyword(s):  
British Columbia ◽  
New Species ◽  
New Genus ◽  
Western Canada ◽  
Subtropical Climate ◽  
Fraser River ◽  
Coast Range ◽  
The West ◽  
Plant Microfossils ◽  
Warm Temperate

Plant microfossils have been recovered from Oligocene sediments which outcrop along the Fraser River in the central interior of British Columbia, Canada. The sediments are composed of interbedded clays, sands, gravels, and lignites which were deposited as a part of an ancestral Fraser River system.The most commonly encountered members of the assemblage are Quercus, Alnus Carya, Liquidambar, Ulmus/Zelkova, Juglans, Pterocarya, Osmunda, and members of the Taxodiaceae, with infrequent occurrences of Engelhardtia, Prosopis, ?Psilotum, Ephedra, and ?Dorstenia. This assemblage suggests a warm temperate to near subtropical climate. A warm polar sea, a lowered Coast Range to the west, and a greater elevation of the Rockies to the east are suggested as a possible explanation for the climate.One new genus and 11 new species have been erected. Several species, including Prosopis quesneli, Diervilla echinata, Triporate B, and Taxodium rousei appear to be restricted to these beds, and may well be good index fossils for the Oligocene of western Canada.

Paleoecology of Eocene lacustrine varves at Horsefly, British Columbia

1977 ◽  
Vol 14 (5) ◽  
pp. 953-962 ◽  
Author(s):  
M. V. H. Wilson
Keyword(s):  
British Columbia ◽  
Depositional Environment ◽  
Middle Eocene ◽  
Lacustrine Sediments ◽  
Late Summer ◽  
Coarse Grained ◽  
Temperate Climate ◽  
Fish Scales ◽  
Plant Remains ◽  
Warm Temperate

Middle Eocene lacustrine sediments, cropping out in the valley of the Horsefly 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 least three sequences of alternating light tuff and dark sapropel laminae, separated stratigraphically by coarse-grained structureless sequences. The proportions of the main types of fossils occurring in the light laminae compared with the dark laminae are significantly different, and are consistent with the hypothesis that the laminations are varves, with dark organic winter laminae and light inorganic summer laminae. Occasional graded sandy layers contain carbonized allochthonous plant remains and represent turbidity deposits caused by storms in the drainage basin.It is proposed here that the varves were deposited in the deeper regions of a stratified, monomictic or meromictic lake in a warm temperate climate. The depositional environment was anaerobic, containing abundant hydrogen sulphide, and was free of turbulence and benthos. Fish were entombed mostly during the winter, insects during the spring and summer, coprolites during the summer, and deciduous leaves during the late summer and autumn. The fish died of starvation and (or) overturn-induced anoxia.

Falcatifolium (Podocarpaceae) macrofossils from paleogene sediments in south-eastern Australia: a reassessment

1998 ◽  
Vol 11 (6) ◽  
pp. 711 ◽  
Author(s):  
Robert S. Hill ◽  
Leonie J. Scriven
Keyword(s):  
Leaf Morphology ◽  
Middle Eocene ◽  
Late Eocene ◽  
South Eastern ◽  
Early Oligocene ◽  
Extant Species ◽  
Eastern Australia ◽  
South Eastern Australia

A re-investigation of macrofossils previously referred to the extantpodocarpaceous genus Falcatifolium Laubenfels shows thatno records can be sustained. Falcatifolium australisD.R.Greenwood from Middle Eocene sediments in Victoria bears littleresemblance to extant species in the genus and is transferred to the newfossil genus Sigmaphyllum R.S.Hill & L.J.Scriven.Specimens from Early Oligocene sediments in Tasmania previously assigned toFalcatifolium are described as a second species ofSigmaphyllum, S. tasmanensisR.S.Hill & L.J.Scriven, and specimens from mid to late Eocene sediments inTasmania previously assigned to Falcatifolium do notbelong to that genus, although their true generic affinities are uncertain.Dispersed cuticle specimens from Late Eocene–Oligocene sediments inSouth Australia referred to Falcatifolium are notreliable records of the genus and require further investigation. However,Dacrycarpus eocenica D.R.Greenwood, from Middle Eocenesediments in Victoria is transferred to Falcatifolium,and is similar to the extant species F. angustumLaubenfels, which has a leaf morphology unusual for the genus.Falcatifolium eocenica (D.R.Greenwood) R.S.Hill & L.J.Scriven is the only reliable record of the genus in the Australian fossilrecord to date.

Evaluation of the allergenicity of various types of urban parks in a warm temperate climate zone

Aerobiologia ◽  
2018 ◽  
Vol 35 (1) ◽  
pp. 57-71 ◽  
Author(s):  
I. Kasprzyk ◽  
T. Wójcik ◽  
P. Cariñanos ◽  
K. Borycka ◽  
A. Ćwik
Keyword(s):  
Urban Parks ◽  
Temperate Climate ◽  
Climate Zone ◽  
Warm Temperate ◽  
Temperate Climate Zone
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