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The Hirnantian Age
446-444 million years ago

The Hirnantian is the seventh and final internationally-recognized of the of the . It was of short duration, lasting about 1.9 million years, from 445.6 ± 1.5 to 443.7 ± 1.5 (million years ago). The early part of the Hirnantian was characterized by cold temperatures, major glaciation, and a severe drop in sea level. In the latter part of the Hirnantian, temperatures rose, the glaciers melted, and sea level returned to the same or to a slightly higher level than it had been prior to the glaciation.

Most scientists believe that this climatic oscillation caused the major extinction event that took place during this time. In fact, the Hirnantian (also known as the End Ordovician and the Ordovician-Silurian) mass extinction event represents the second largest such event in geologic history. Approximately 85 % of marine (sea-dwelling) species died. Only the End mass extinction event was larger. Unlike many smaller extinction events, however, the long-term consequences of the End Ordovician event were relatively small. Following the climatic oscillation, the climate returned to its previous state, and the species that survived soon (within two or three million years) evolved into species very similar to the ones that existed before.

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The Hirnantian was named after Cwm Hirnant near Bala, in northern Wales. Cwm Hirnant means the "valley of the long stream" in Welsh.

The stage was introduced in 1933 by B.B. Bancroft. As proposed by Bancroft, the Hirnantian included the Hirnant Limestone and related sedimentary formations. These formations were located at the very top of Ordovician deposits, and were dominated by a fauna which included brachiopods, trilobites, and other “shelly” or hard-coated animals. In 1966, D. A. Bassett, Harry Blackmore Whittington, and A. Williams, writing in the Journal of the Geological Society of London, proposed a refinement to the Hirnantian stage. This expanded the stage to include all of the Foel-y-Ddinas Mudstones, of which the Hirnant Limestone is a part. This expansion brought the Hirnantian stage to its current scope.

The (ICS) originally divided the Upper Ordovician into two stages. After considerable research, however, it was determined that no single faunal zone existed that could accommodate the upper stage of this division. Therefore, in 2003, the ICS voted to add an additional stage to its official international time scale. This was named the Hirnantian after Bancroft's stage.

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Rate of extinction vs. .

As mentioned above, there was a major climatic oscillation during the Hirnantian, which is believed to have caused a major mass extinction event. When the Hirnantian stage began, the earth's climate was hot and sea-levels were substantially higher than today. The seas were filled with a diverse fauna. However, there is considerable evidence to indicate that many of these species were already in trouble when the Hirnantian began, and that overall biological diversity was already in sharp decline.

As the climate cooled and glaciers formed during the early part of the Hirnantian, sea level dropped. Estimates of the depth of this drop range from more than 50 meters (based on studies in Nevada and Utah) to more than 100 meters (from studies in Norway and the United Kingdom). More recent research indicates a world-wide reduction in sea level of approximately 80 meters. This drop dried up and exposed the extensive shallow-water continental shelves that existed throughout the world at that time, causing the extinction of large numbers of species who depended on this shallow water environment. Those species that survived were greatly reduced in numbers. The overall result was a major reduction in the biodiversity of the world's oceans.

During this ice-house period (as scientists sometimes call periods of global cold weather and glaciation), surviving species began to adapt. Cold environment species replaced the warm environment species that had thrived during the previous hot period (hot-house to scientists).

Just as the species were adapting, however, the climate changed again. During the latter part of the Hirnantian, temperatures rose, the glaciers melted, and sea level rose to the same or perhaps an even higher level than before the glaciation. The exposed shelves were flooded, resulting in additional extinctions among the fauna that had survived the first extinction event.

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While there are no major radiometric dates for the Hirnantian itself, there are two such dates which bracket the Hirnantian. Both dates are from the Dob's Linn area in the United Kingdom.

The older one comes from the local Hartfell shale formations. Zircons found in an ash deposit at the site was dated to 445.7 Ma, with a margin of error of plus or minus 2.4 million years.

The younger date is from the early Silurian Birkhill shale formations. Radiometric dating placed Zircon samples found in another ash deposit at 438.7 mya, with a margin of error of plus or minus 2.1 million years.

With these dates as a base, scientists were able to use biostratigraphic correlation techniques to determine close approximations for the timing of various events during the Hirnantian.

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While it is not usual practice for scientists to formally divide geologic time below the level of a stage (though sub-stages are known in some instances), zones of biological distinction (called Biozones) provide a generally recognized way of defining divisions at smaller levels. Biozones represent a period of time during which a specified species or group of species existed and left a fossil record of their presence.

There are two biozones in the Hirnantian and these are of approximately equal length. The base (beginning) of the Hirnantian stage is defined by the first appearance in the geologic record of the graptolite Normalograptus extraordinarius, and thus, the Normalograptus extraordinarius biozone defines the early (or lower) part of the Hirnantian. The later (or upper) part is defined by the first appearance of the graptolite Normalograptus persulptus, and the Normalograptus persulptus biozone lasts from then until the end of the Hirnantian. This also marks the end of the period.

These biozones allow for additional refinement in dating events occurring within the Hirnantian stage.

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Paleogeography is highly debated and often fraught with uncertainties. This is especially true the farther one goes back in the geologic record. The following interpretation represents the current views of many scientists. However, these views are disagreed with and strongly debated by many others.

During the Hirnantian, much of the world’s land mass was gathered into a called , which occupied extreme southern latitudes and covered the south poll. This included , , most of , the bulk of , and . What is now west Africa was then located at the pole, while South America was close by, joined to Africa along the latter’s west coast. Along Africa’s east coast were Antarctica and India, while Australia lay just to the north of them, straddling the equator. To the north of Australia was . It may have been the northern most point of land in the world, located just above 30 degrees north latitude. To the north of it lay a vast, uninterrupted sea, known today as the .

Not yet joined with what would become North America; Florida, southern Georgia, and the coastal areas of Mississippi, Alabama, and South Carolina were wedged into a gap between Africa and South America, and were located very near the South pole.

The rest of North America (called by scientists) lay to the north and west of Gondwana, at (like Australia) low and relatively warmer climates. Rotated almost 45 degrees from its modern orientation, the eastern states of today’s U.S. were located along the southeast coast of the continent, while the coastal areas of what are now the southeastern states faced south.

To the east of Laurentia, across a long, narrow sea, was . Composed of modern Norway, Sweden, Finland, the UK, Belgium, Denmark, the Netherlands, northern Germany, eastern Ireland, and Russia west of the Ural mountains, this area ranged from the equator in the north to more than 30 degrees south latitude.

Stretching westward from its southwest tip was an island arch known as by modern scientists. This consisted of what is now the western part of Ireland, and eastern coastal regions of Newfoundland, Nova Scotia, New Brunswick, and New England.

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The Hirnantian now represents an internationally accepted stage with a carefully specified global beginning and ending. However, it started out in the nineteenth century as a regional stage in the United Kingdom, where it remains as such today. Since various regions of the world have their own local divisions of below the Period level, the following list provides correlations between those regional stages (or epochs in some cases) and the internationally-recognized Hirnantian stage.

  • Australasia – The Hirnantian is equal to approximately the top 20 % of the regional Bolindian epoch.
  • Baltica – The Hirnantian is equivalent to the upper 50 % of the regional Porkuni stage.
  • China – The Hirnantian is roughly equal to the upper 25 % of the regional Wufeng stage.
  • North America – The Hirnantian is equivalent to all of the regional Gamachian stage.
  • United Kingdom – The Hirnantian is nearly equal to the regional Hirnantian stage, which starts slightly (maybe 100,000 years) earlier. The regional Hirnantian constitutes roughly the upper 20 % of the Ashgill epoch.

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  • Chen Xu, Rong Jia-yu, Fan Juan-xuan, Zhan Ren-bin, C. E. Mitchell, D. A. T. Harper, M. J. Melchin, and Wang Xiao-feng, "A final report on the GSSP candidate of the Hirnantian Stage" (International Commission on Stratigraphy).
  • Gradstein, Felix, James Ogg, and Alan Smith, eds., 2004. A Geologic Time Scale 2004 (Cambridge University Press).
  • Salvador, Amos, ed., 1994. International Stratigraphic Guide (The International Union of Geological Sciences and The American Geological Society).
  • Sheehan, Peter, "The Late Ordovician Mass Extinction" (Annual Review of Earth and Planetary Sciences, 2001, pp. 331-364).
  • Webby, Barry D. and Mary L. Droser, eds., 2004. The Great Ordovician Biodiversification Event (Columbia University Press).

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  • Brenchley, P. J., 1984. "Late Ordovician extinction and their relationship to the Gondwana glaciation", in Brenchley, P. J., ed., Fossils and Climate. pp. 291-316, (John Wiley & Sons).
  • Hallam, A. and Paul B. Wignall, 1997. Mass extinctions and their aftermath (Oxford University Press).

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  • paleogeography
  • (very brief entry)

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