Avalonian orogeny

Avalonian orogeny

      a mountain-building event that affected the eastern portion of the Appalachian Geosyncline in late Precambrian time (Precambrian time occurred from 3.96 billion to 540 million years ago). Evidence for the orogeny consists of igneous intrusions, folding of strata, and the development of angular unconformities in the Avalon Peninsula of Newfoundland, the eastern portion of the Maritime Provinces of Canada, and the southeastern coastal area of New England. Thick sequences of late Precambrian clastic sedimentary rocks in the Blue Ridge and Piedmont provinces of the central and southern Appalachians may also be a reflection of the Avalonian orogeny in these areas.

* * *


Universalium. 2010.

Игры ⚽ Поможем решить контрольную работу

Look at other dictionaries:

  • Iapetus Suture — The Iapetus Suture is one of several major geological faults caused by the collision of several ancient land masses forming a suture. It represents in part the remains of what was once the Iapetus Ocean. Iapetus was the father of Atlas in Greek… …   Wikipedia

  • Geology of England — The Geology of England is mainly sedimentary. The youngest rocks are in the south east around London, progressing in age in a north westerly direction. [ [http://www.soton.ac.uk/ imw/Geology Britain.htm Southampton University] retrieved 21/1/07]… …   Wikipedia

  • Avalonia — was an ancient microcontinent or terrane whose history formed much of the older rocks of Western Europe, Atlantic Canada, and parts of the coastal United States. The name is derived from the Avalon Peninsula in Newfoundland. DevelopmentThe early… …   Wikipedia

  • History of the Earth — For the history of modern humans, see History of the world. Geological time put in a diagram called a geological clock, showing the relative lengths of the eons of the Earth s history The history of the Earth describes the most important events… …   Wikipedia

  • Geology of Wales — Wales is a peninsula in the south west of the island of Great Britain. The entire area of Wales is about 20,779 km² (8,023 square miles). It is about 274 km (170 miles) north south and 97 km (60 miles) east west. Wales is bordered by England to… …   Wikipedia

  • Silurian Period — Interval of geologic time, 443–417 million years ago. The third period of the Paleozoic Era, the Silurian follows the Ordovician Period and precedes the Devonian. It marks the first appearance of land plants and jawed fishes. The continents were… …   Universalium

  • Windermere supergroup — The Windermere supergroup is a geological unit formed during the Ordovician to Silurian periods Ma|450, and exposed in the north west of England, including the Pennines and correlates along its strike, in the Isle of Man and Ireland, and down dip …   Wikipedia

  • Geology of Yorkshire — In Yorkshire there is a very close relationship between the major topographical areas and the geological period in which they were formed. The Pennine chain of Hills in the west is of Carboniferous origin. The central vale is Permo Triassic. The… …   Wikipedia

Share the article and excerpts

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