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all geography including DSDP/ODP Sites and Legs
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Fyles Leaf Beds
Leaf-rich cross-strata at Fyles Leaf Beds. A ) Eastwards directed inclined...
Geomorphology of area west of Fyles Leaf Beds, suggesting paleovalley of ri...
Flat-laminated organic-rich deposits in Facies 2B at Fyles Leaf Beds. A ) ...
Examples of plant debris utilized by other organisms in the high terrace de...
WOOD JAMS OR BEAVER DAMS? PLIOCENE LIFE, SEDIMENT AND LANDSCAPE INTERACTIONS IN THE CANADIAN HIGH ARCTIC
Styles of woody debris accumulations in the high terrace deposits on Ellesm...
Sedimentological character of the high terrace deposits at the Fyles Leaf B...
Location of the study sites within the Canadian High Arctic, showing places...
Examples of woody debris incorporated into bedforms at various sites. A ) ...
Rose diagrams comparing orientation of woody debris at Beaver Pond site to ...
MOLECULAR PRESERVATION OF CENOZOIC CONIFER FOSSIL LAGERSTÄTTEN FROM BANKS ISLAND, THE CANADIAN ARCTIC
Cross-Bedded Woody Debris From A Pliocene Forested River System In the High Arctic: Beaufort Formation, Meighen Island, Canada
ABSTRACT Meighen Island, in the Canadian Arctic Archipelago, is one of the most important localities for study of the late Neogene Beaufort Formation because of the presence of marine sediments interbedded with terrestrial fossiliferous sands. The stratigraphic succession, fossils from the marine beds, correlation with reconstructions of sea level, and paleomagnetic data from the Bjaere Bay region of the island suggest that the Beaufort Formation on Meighen Island was likely deposited either at 3.2–2.9 Ma or during two intervals at ca. 4.5 Ma and 3.4 Ma. The exposed Beaufort Formation on Meighen Island probably encompasses at least one warm interval and eustatic sea-level highstand of the Pliocene. Fossils of plants and arthropods are abundant in the alluvial sands exposed in the Bjaere Bay region. The lower part of the sequence (Unit A), beneath the muddy marine sequence (Unit B), contains plant taxa that have not been seen above the marine beds. Sediments below the marine beds are dominated more by fossils of trees, whereas the organic debris from above marine beds contains many fossils of plants, insects, and mites characteristic of open treeless sites. Regional tree line probably occurred on Meighen Island during deposition of the upper sediments, which implies a mean July climate at least 9 °C warmer than at present. When the marine sediments were deposited, nearshore water temperatures probably did not fall below 0 °C; hence, the Arctic Ocean probably lacked perennial ice cover. This confirms recent modeling experiments exploring the causes of Arctic amplification of temperature that have found the removal of sea ice to be a key factor in resolving previous proxy-model mismatches.
Pollen morphology of the three subgenera of Alnus
Pleistocene organic matter modified by the Hiawatha impact, northwest Greenland
TERTIARY GEOLOGY AND PALYNOLOGY OF THE QUESNEL AREA, BRITISH COLUMBIA
Abstract Following the collapse of the >2000 km long Givetian (Middle Devonian) Inuitian/Ellesmere carbonate platform factory in arctic Canada, within the 0° to 10° equatorial palaeolatitudes north, the only Frasnian reefs in high arctic Canada retreated westwards, confined to northeastern Banks Island. These reefs, numbering well over 130, and dominated by corals and stromatoporoid sponges, were spread over c . 5000 km 2 , within the 220 m thick Mercy Bay Formation. Reefs were developed at four different stratigraphic levels (termed the A, B, C and D levels) during early and middle Frasnian time, periodically smothered by intervening siliciclastics during sea-level lowstands, and were finally buried by thick siliciclastic sands, silts and muds derived from the east during the late Frasnian. The Frasnian–Famennian boundary is masked within continental, deltaic facies bearing plant remains. The Banks reef and carbonate succession is preserved as horizontally stratified, in situ limestones, with the succeeding reefs backsteppping towards the east, in response to cyclic Frasnian sea-level rises. The Banks reefs were developed on the distal lobes of a megadelta, periodically covered by extensive lowland forests that stretched more than 2000 km west from Greenland and Ellesmere Island. Reefs are three-dimensionally preserved, unaffected by diagenesis, dolomitization, major tectonics, vegetative cover or glaciation, and thus display some of the finest, pristine Late Devonian reef complexes known. The reefs represent a range of geometries, from small circular to oval patch reefs a few tens of metres in diameter and <5–10 m thick, to larger prominent tabular (‘reef platform’ style) and domal reef structures >2 km across, or 300–400 m diameter, and 40–60 m thick. Coral and stromatoporoid-rich biostromes also formed a significant part of the reef seascape. Morphology of the reefs leads to an estimation of penecontemporaneous relief of 10–20 m above the prevailing sea floor, with reef-core facies generally dominated by stromatoporoid sponges, and flank facies by a variable mix of colonial tabulate and rugose corals, as well as stromatoporoids. Bryozoans and calcimicrobialites were rare, in contrast to other Late Devonian reefs such as those of the Canning Basin (Australia), or the Guangxi platform (South China); mudmound reef facies, such as seen in Belgium were limited.
Abstract The Pliocene ( c. 5.3–1.8 Myr BP) was the last epoch of geological time in which global temperatures were generally higher than modern. It is important if we are to understand the dynamics of warm climates. This is particularly true of the interaction of climate and cryosphere, where the Pliocene may represent the first epoch in which ice sheets, at least on Antarctica, were a permanent feature. In this paper, we review the available evidence for the state of ice sheets during the Pliocene as well as previous attempts to model them. We then present new models and sensitivity studies of the mid-Pliocene East Antarctic Ice Sheet (EAIS) and consider the implications for the debate on ice-sheet stability during the Pliocene. These new reconstructions suggest that the mid-Pliocene EAIS was significantly smaller than modern, but the modelled average mid-Pliocene climate is not sufficient to cause the widespread deglaciation suggested by Sirius Group diatom evidence.
Abstract The Hugh Miller collection (mainly NMS G.1859.33) held at the National Museums of Scotland, Edinburgh, consists of 591 palaeobotanical specimens, 54 of which are of type and/or figured status. A preliminary assessment of this collection, in the light of renewed interest in Hugh Miller’s works in the bicentenary of his birth (2002), has provided new insights into this remarkable Scottish geologist. Miller, through writing popular articles in both newspaper and book format, publicized the various subdisciplines of palaeontology including palaeobotany. His distinctive writing style promoted public understanding of the science, and helped his readers to grasp the concept of deep time and the intricacies of past worlds. An appendix of type and figured material based on Miller’s collection is included.