tephrochronology

tephrochronological /tef'roh kron'l oj"i keuhl/, adj.
/tef'roh kreuh nol"euh jee/, n. Geol.
a geochronologic technique based on the dating of layers of volcanic ash. Cf. tephra.
[1940-45; < Sw tefrokronologi, equiv. to tefr(a) volcanic ejecta ( < Gk téphra ash) + -o- -O- + kronologi CHRONOLOGY]

* * *

      method of age determination that makes use of layers of ash (tephra). Tephra layers are excellent time-stratigraphic markers, but, to establish a chronology, it is necessary to identify and correlate as many tephra units as possible over the widest possible area. Because of the large number of violent volcanic explosions in Iceland, Sigurdur Thorarinsson, an Icelander who was the founder of the science of tephrochronology, was able to establish a detailed chronology of preoccupational and postoccupational geologic and archaeological events there. Tephrochronology enabled Thorarinsson to make a thorough study of the changes in climate in Iceland and the effect of agriculture on Icelandic ecology.

      Japan is another fertile field for tephrochronological studies, and, not surprisingly, Japanese scientists have greatly contributed to the development of the science. In western North America, Pleistocene tephra (those from 10,000 to 1,600,000 years old) have been correlated over a distance greater than 1,600 km (1,000 miles). Tephra may be traced from the land areas into the ocean basins and, thus, may provide one of the most effective techniques for correlating terrigenous with marine stratigraphic deposits.

* * *


Universalium. 2010.

Look at other dictionaries:

  • Tephrochronology — is a geochronological technique that utilises discrete layers of tephra mdash;volcanic ash from a single eruption mdash;to create a chronological framework in which paleoenvironmental or archaeological records can be placed. Such an established… …   Wikipedia

  • tephrochronology — ALASKA VOLCANO OBSERVATORY GLOSSARY The collection, preparation, petrographic description, and approximate dating of tephra …   Glossary of volcanic terms

  • tephrochronology — tephrochronological /tef roh kron l oj i keuhl/, adj. /tef roh kreuh nol euh jee/, n. Geol. a geochronologic technique based on the dating of layers of volcanic ash. Cf. tephra. [1940 45; < Sw tefrokronologi, equiv. to tefr(a) volcanic ejecta… …   Useful english dictionary

  • Saksunarvatn tephra — In the new science of tephrochronology, Saksunarvatn tephra are volcanic ejecta that form an ash layer that is useful in dating Northern European sediment layers that were laid down during the Boreal period, the warm climate phase that followed… …   Wikipedia

  • Ramesses III — Pharaoh Infobox | Name=Ramesses III| ImageSize=150 Caption=Relief from the Sanctuary of Khonsu Temple at Karnak depicting Ramesses III Alt=Also written Ramses and Rameses| NomenHiero= C2 ms z:z HqA q iwn Nomen= Ramesse Hekaiunu Ra bore him, Ruler …   Wikipedia

  • Geochronology — A schematic depiction of the major events in the history of our planet. Geochronology is the science of determining the age of rocks, fossils, and sediments, within a certain degree of uncertainty inherent to the method used. A variety of dating… …   Wikipedia

  • Asahidake — Mount Asahi 旭岳 Mount Asahi, the tallest peak in Hokkaidō (September 2004) Eleva …   Wikipedia

  • Sigurdur Thorarinsson — Infobox Scientist name = Sigurdur Thorarinsson image width = 250px caption = birth date = January 8, 1912 birth place = Vopnafjörður, Iceland death date = February 8, 1983 death place = Reykjavík, Iceland residence = citizenship = nationality =… …   Wikipedia

  • Hekla 3 eruption — The Hekla 3 eruption (H 3) circa 1000 BC is considered the most severe eruption of Hekla during the Holocene. [cite journal |last=Eiríksson |first=Jón |authorlink= |coauthors= et al. |year=2000 |month= |title=Chronology of late Holocene climatic… …   Wikipedia

  • Dating methodologies in archaeology — Dating material drawn from the archaeological record can be made by a direct study of an artifact or may be deduced by association with materials found in the context the item is drawn from or inferred by its point of discovery in the sequence… …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.