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USA's ancient hurricane belt and the US-Canada equator
Date:11/15/2012

The belt also lacks typical storm-related sedimentary features where the deposits are disturbed by bad weather. The researchers say that this shows that the Late Ordovician equatorial zone, like the equatorial zone today, had few hurricane-grade storms.

In contrast, sedimentary deposits recorded on either side of the belt provide evidence of disturbance by severe storms. Hurricanes tend to form in the areas immediately outside of equatorial zones where temperatures of at least 260C combine with the Earth's rotation to create storms. The researchers believe that hurricane belts would probably have existed on either side of the ancient equator, within the tropics.

The position of the equatorial belt, defined by undisturbed fossil accumulations and sediments, is coincident with the Late Ordovician equator interpreted from magnetic records (taken from rocks of a similar age from the region). This provides both a precise equatorial location and confirms that the Earth's magnetic field operated much in the same way as it does today.

The scientists pieced together the giant jigsaw map using the evidence of the disturbed and undisturbed sedimentary belts together with burrows and shells. Using the findings from these multiple sites, they were able to see that North America sat on either side of the Equator.

Co-author Christian Rasmussen, University of Copenhagen, said: "The layers of the earth build up over time and are commonly exposed by plate tectonics. We are able to use these ancient rocks and their fossils as evidence of the past to create an accurate map of the Ordovician globe."

Professor Harper added: "The findings show that we had the same climate belts of today and we can see where North America was located 450 million years ago, essentially on the Equator."

"While the Equator has remained in approximately the same place over time, the landmasses have shifted dramatically over time through tectonic moveme
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Contact: Carl Stiansen
c.r.stiansen@durham.ac.uk
44-191-334-6077
Durham University
Source:Eurekalert  

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