Drift carbonate on the Canadian Shield

1987 ◽  
Vol 24 (2) ◽  
pp. 365-369 ◽  
Author(s):  
P. F. Karrow ◽  
R. S. Geddes
Keyword(s):  
Hudson Bay ◽  
Long Distance ◽  
The North ◽  
Long Distance Transport ◽  
Organic Sediment ◽  
High Carbonate ◽  
Paleozoic Carbonates ◽  
Lake Deposits ◽  
Distance Transport ◽  
Fine Organic

Carbonates occur in the drift over large areas of the Precambrian Shield in Ontario. Paleozoic carbonates were transported by glaciers from the Hudson Bay Lowland and from Manitoba. Local sources in Precambrian rocks also contribute carbonate. A carbonate line corresponding approximately to the Nipigon and Chapleau moraines delimits high–carbonate drift to the north and may represent a significant ice marginal position or readvance about 9500 BP.Shield drift carbonates suggest that there are potential errors in radiocarbon dating of fine organic sediment (old carbon error); that there is a relationship between the occurrence of fossil molluscs in glacial and postglacial lake deposits and drift carbonate distribution; that long-distance transport will affect drift prospecting; and that susceptibility to acidification of lakes is affected by both drift and bedrock composition.

The myth of long-distance megalith transport

Antiquity ◽  
1991 ◽  
Vol 65 (246) ◽  
pp. 64-73 ◽  
Author(s):  
R. S. Thorpe ◽  
O. Williams-Thorpe
Keyword(s):  
Western Europe ◽  
Long Distance ◽  
The North ◽  
Long Distance Transport ◽  
Early Farming ◽  
Distance Transport

The megalithic monuments of western Europe have long been a celebrated proof of the engineering achievements possible in an early farming society. With the engineering skills to raise up the stones went the capability to move them to the site, with Stonehenge the best-known example of an apparent long-distance transport, incorporating Welsh bluestones and sarsens that perhaps originate in the Avebury region to the north. Following their recent challenge to the belief that the builders of Stonehenge did carry its bluestones from west Wales, the authors look critically at the larger pattern of megalithic manoeuvring.

Paleoecological implications of the first prehistoric record of water vole (Microtus richardsoni) from Washington state, USA

2019 ◽  
Vol 92 (2) ◽  
pp. 381-387
Author(s):  
R. Lee Lyman
Keyword(s):  
Late Holocene ◽  
Sampling Error ◽  
Archaeological Site ◽  
Cascade Range ◽  
Western Montana ◽  
Water Vole ◽  
Long Distance ◽  
The North ◽  
Long Distance Transport ◽  
Distance Transport

AbstractRemains of the North American water vole (Microtus richardsoni) have previously been recovered from late Pleistocene and Holocene deposits in southwestern Alberta, western Montana, and north-central Wyoming. All are within the historically documented modern range of the metapopulation occupying the Rocky Mountains; no ancient remains of this large microtine have previously been reported from the metapopulation occupying the Cascade Range. Four lower first molar specimens from the late Holocene Stemilt Creek Village archaeological site in central Washington here identified as water vole are from the eastern slope of the Cascade Range and are extralimital to the metapopulation found in those mountains. There is no taphonomic evidence indicating long-distance transport of the teeth, and modern trapping records suggest the local absence of water voles from the site area today is not a function of sampling error. The precise age of the Stemilt Creek Village water voles is obscure but climate change producing well-documented late Holocene advances of nearby alpine glaciers could have created habitat conditions conducive to the apparent modest shift in the range of the species represented by the remains.

The First Waggons and Carts—from the Tigris to the Severn

1951 ◽  
Vol 17 (2) ◽  
pp. 177-194 ◽  
Author(s):  
V. Gordon Childe
Keyword(s):  
Farmyard Manure ◽  
Long Distance ◽  
The North ◽  
Long Distance Transport ◽  
12Th Century ◽  
Cultivable Land ◽  
Women And Children ◽  
Wheeled Vehicles ◽  
Distance Transport ◽  
Economic Use

At the end of the 12th century A.D. Henry II sent a substantial portion of the provisions and gear for his invasion of Ireland from Abingdon and Oxford to Bristol by cart. At the beginning of the 12th century B.C. a migrating horde from the north conveyed its household goods, women and children to the frontiers of Egypt in ox carts. No doubt the wide alluvial plains of Hither Asia, even before goats and charcoal-burners had stripped them of their parkland vegetation, were more congenial to the use of wheeled vehicles for long distance transport than the temperate forests of Britain and Cis-Alpine Europe. Still even in Asia, I suspect, the first economic use of wheeled vehicles was for the carriage of bulky foodstuffs from the fields, where they were grown, to the settlements, where they were stored and consumed, and of farmyard manure in the opposite direction. It was in this way by allowing a larger population to be fed at a single centre that the invention of the wheel contributed to the Urban Revolution in Mesopotamia. (In Egypt, where all cultivable land lies close to the Nile, boats took the place of carts).

The Fine Structure of Phloem Cells

1985 ◽  
Vol 43 ◽  
pp. 632-635
Author(s):  
James Cronshaw
Keyword(s):  
Structural Studies ◽  
High Concentration ◽  
Long Distance ◽  
Phloem Tissue ◽  
Sieve Elements ◽  
Long Distance Transport ◽  
P Protein ◽  
Companion Cells ◽  
Electron Microscopical ◽  
Distance Transport

Long distance transport in plants takes place in phloem tissue which has characteristic cells, the sieve elements. At maturity these cells have sieve areas in their end walls with specialized perforations. They are associated with companion cells, parenchyma cells, and in some species, with transfer cells. The protoplast of the functioning sieve element contains a high concentration of sugar, and consequently a high hydrostatic pressure, which makes it extremely difficult to fix mature sieve elements for electron microscopical observation without the formation of surge artifacts. Despite many structural studies which have attempted to prevent surge artifacts, several features of mature sieve elements, such as the distribution of P-protein and the nature of the contents of the sieve area pores, remain controversial.

scholarly journals Comparative Analysis of Long-Distance Transportation with the Example of Sea and Rail Transport

Energies ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1689
Author(s):  
Tomasz Neumann
Keyword(s):  
Eastern China ◽  
Time Cost ◽  
Topsis Method ◽  
Long Distance ◽  
Long Distance Transport ◽  
The Subject ◽  
Transport Analysis ◽  
Multi Criteria Analysis ◽  
The Relationship ◽  
Distance Transport

The subject of the article is a comparative long-distance transport analysis based on the relationship between central and eastern China and Poland. It provides an overview of issues related to long-haul China–Poland. The technique for order of preference by similarity to ideal solution (TOPSIS) method was proposed in the multi-criteria analysis. This method was briefly discussed, and its choice was justified. Then, the criteria adopted in the analysis were presented, i.e., time, cost, maximum number of containers, and ecology index. Multi-criteria analysis was carried out for three cases: the transport of one loading unit, 82 loading units, and 200 loading units. The geopolitical and operational situation on the transport route for the analyzed modes of transport was discussed.

scholarly journals Selecting sorting centres to avoid long distance transport of weaned beef calves

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
T. Morel-Journel ◽  
E. Vergu ◽  
J.-B. Mercier ◽  
N. Bareille ◽  
P. Ezanno
Keyword(s):  
Negative Impact ◽  
Historical Record ◽  
Management Tool ◽  
Long Distance ◽  
Beef Calves ◽  
Long Distance Transport ◽  
And Performance ◽  
Distance Transport ◽  
French Beef ◽  
General Concern

AbstractThe transport of weaned calves from cow–calf producers to fatteners is a general concern for the young bull industry due to its documented negative impact on the welfare, health and performance of the animals. These transfers are often managed by intermediaries who transport weaned calves to sorting centres, where they are grouped into batches before being sent to fattening units. In this study, we present an algorithm to limiting these transfer distances by appropriately selecting the sorting centre through which they must go. We tested the effectiveness of this algorithm on historical data from a French beef producer organization managing 136,892 transfers using 13 sorting centres. The results show a decrease in the transfer distances compared to the historical record, especially for the calves travelling over long distances (− 76 km, i.e. 18% on average for the 33% longest transfers). Moreover, the distribution of calves between the sorting centres proposed by the algorithm reveals differences in their efficiency in minimizing transfer distances. In addition to its usefulness as a management tool for the daily transport of cattle, this algorithm provides prospects for improving the management of the sorting centres themselves.

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