Glaciations continental

During the past 2.4 million years the Earth has gone through several episodes of continental glaciation (see Hughes, 1985). Each of the last seven of these episodes (600 000 years) shows a characteristic pattern of waxing and waning... 

It is generally agreed that continental glaciation and deglaciation induce changes in the 5 0-value of the ocean on short time scales. There is, however, considerable debate about long-term changes. 

These vertical movements can be linked to plate tectonic dynamics, but not all vertical movements may be a result of plate tectonics. It should be kept in mind that before the time of unidirectional burial of a sediment, as depicted for the carbonate rock sequence of Figure 7.4, for its first 125 million years of existence, the position of the sediment-water (air) interface may vary for reasons other than tectonics. Episodes of continental glaciation and deglaciation, as well as geoidal perturbations... 

The coast of the State of Maine is one of the most irregular in the world. (2) It is deeply indented with many coves and harbors, and numerous small islands dot the shoreline. (3)In fact, this area is a prime example of what geologists refer to as a drowned coastline. (4)Draw a straight line from the southernmost city in Maine, Kit-tery, to the northernmost coastal city, Eastport. (5)This line would measure about 225 miles. (6)Follow the coastline between the same two cities. (7)The distance is more than ten times as far. (8)What is the cause of this irregularity (9)The ice age, or age of continental glaciation, which occurred thousands of years ago. 

What is the cause of this irregularity (9)The ice age, or age of continental glaciation, which occurred thousands of years ago. 

Trofimuk, A. A., Cheraski, N. V., and Tsaryov, V. P, The Role of Continental Glaciation and Hydrate Formation on Petroleum Occurrence, in R.F. Meyer (Ed.), pp. 919-926, The Future Supply of Nature-made Petroleum and Gas, New York, Pergamon 1977. 

This continental glaciation happened seven times over the last 2.2 million years. Warm intervals, some of them hundreds of thousands of years long, stretched between these planetary deep-freezes. Geologists do not agree whether the ice will return or not. Even if the present day is in a warm period between glaciations, tens or hundreds of thousands of years may elapse before the next advance of the ice sheets. 

Although the ratio of 180 160 in carbonate tests of marine invertebrates can be used to examine sea surface temperatures, the extent of continental glaciation, the balance between precipitation and evaporation, the carbonate compensation depth and the diagenetic alteration of carbonate all influence whether an estimation can be made and its accuracy (Boxes 5.6, 5.7 Marshall 1992). There is also a reliable organic geochemical palaeothermometer based on the distributions of long-chain (C37-C39) unsaturated ketones (Brassell et al. 

Schmidt DL, Ford AB (1966) Geology of the northern Pensacola Mountains and adjacent areas. Antarctic J US 1(4) 125 Schmidt DL, Ford AB (1969) Geology of the Pensacola and Thiel Mountains. In Craddock C et al. (eds) Geologic maps of Antarctica. Antarctic Map Folio Series, Sheet 5, Folio 12. American Geographical Society, New York Schmidt DL, Williams PL (1967) Continental glaciation of late paleozoic age, Pensacola Mountains, Antarctica. In, AJ Amos, ed., Gondwana Stratigraphy, 2 91-106. UNESCO, Paris... 

The most recent continental glaciation which occurred during the Pleistocene may not yet have ended. For example, Carlson et al. (2008) have recently modeled the disintegration of the Laurentide ice sheet of North America and Siddall and Kaplan (2008)... 

The complex inieraclion of many faclors Ihal can cause continental glaciations was succinctly expressed by Crowell and Frakes (1970, p. 193) ... 

If geologic history were to repeat itself, the next continental glaciation of the Earth may occur in about 10,000 years. 

Thompson 1977a). The ice-core depth to the H/W (Holocene/ Wisconsinan) transition occurs at different depths depending on the rate of accumulation of snow at each site. The H/W transitions in the Antarctic and Greenland cores occur at about the same time in the past which confirms the bipolar occurrence of continental glaciation (Adapted from Thompson and Mosley-Thompson 1981, Figure 6)... 

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