Talk:Avalonia

"Iceland - a microcontinent"

According to my geology teacher Iceland is not a continent at all, it's not the same material. —Preceding unsigned comment added by 82.148.70.130 (talk) 11:32, 15 February 2010 (UTC)

Agreed, I've removed it (sorry you had to wait so long). Mikenorton (talk) 22:57, 17 November 2010 (UTC)

"Avalon terrane", rather than "Avalonian terrane"?

Google yields 1000 vs 400 hits. 66.30.117.127 02:32, 16 December 2006 (UTC)

• Suppe (1985): Structural Geology uses "Avalonian terrane" (p 450);
• Levin (2003, 7th ed): The Earth through Time uses "Avalon terrane" (p 312);
• Neuendorf, Mehl & Jackson (2005, 5th ed): Glossary of Geology use "Avalon platform" (p 46);
• Van der Pluijm & Marshak (2004, 2nd ed): Earth Structure use "Avalon zone" or simply "Avalon" or "Western Avalonia" (p 602);
• A quick search with Google scholar yields 933 hits for "Avalon terrane", 231 hits for "Avalonian terrane", 758 hits for "Avalon zone" and 179 hits for "Avalon platform". Note that some of these terms are not strict synonyms.

We can conclude from the above that more than one form is used to address this terrane in northeastern North America. Avalon terrane seems to be the most commonly used name, but when an article about the terrane is created the other names would have to appear too. Woodwalker (talk) 12:57, 15 February 2010 (UTC)

Maps

The link under Maps is dead. — Preceding unsigned comment added by Squike (talk • contribs) 19:14, 22 February 2011 (UTC)

Avalonia - Armorica - Cimmeria - China superterrane ?

Inexpertly, the ancient terranes of Avalonia, Armorica, Cimmeria, and south & north China, may have formed a long super-terrane, stretching along, and forming, the (then-)northern coast of Gondwana. Those terranes had been attached to Africa, Arabia, India, & Australia:

http://s10.postimage.org/o10goj0rt/Avalonia_Armorica_Cimmeria_China_superterrane.png

66.235.38.214 (talk) 12:25, 18 October 2012 (UTC)

External links modified

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Introduction

Hello, Re the introduction I have just changed two names in a sentence in the introduction’s 2nd paragraph: from “The Paleo-Tethys Ocean formed behind it, and the Rheic Ocean shrank in front.” to “The Rheic Ocean formed behind it, and the Iapetus Ocean shrank in front.” This article's second paragraph had: 'Avalonia ... eventually rifted off, becoming a drifting microcontinent. The Paleo-Tethys Ocean formed behind it, and the Rheic Ocean shrank in front.' But on my understanding of modern sources, that account mis-places the oceans. The Paleo-Tethys Ocean formed behind a different microcontinent in a different rift event (separation of the European Hunic terranes from Gondwana), at a later date - about fifty million years later. So, in an account of the rifting of Avalonia this account gets the Rheic Ocean the wrong way around: it was the Iapetus ocean that 'shrank in front' of the northwards drifting Avalonia, while what was formed and opening ever wider, in the rift behind the new microcontinent, was the Rheic Ocean. For example, see: ‘[R]ifting of the Rheic Ocean took place along the northern margin of Gondwana in the mid- to Late Cambrian, by which time Iapetus was already a wide ocean. The terranes that separated from Gondwana as the ocean opened in the Early Ordovician, such as Avalonia and Carolinia, were in large part the same terranes that had accreted to this margin in the Late Neoproterozoic.' R.D. Nance et al. / Geoscience Frontiers 3(2) (2012) < https://ac.els-cdn.com/S1674987111001113/1-s2.0-S1674987111001113-main.pdf?_tid=3be6580e-1e8b-4119-86d1-9d5c30392b3a&acdnat=1520985008_4b35ed4e9fe28ad7e9bb7009c22c1271 > p 128. 'Throughout the Ordovician, the Rheic Ocean widened at the expense of Iapetus as the departing peri-Gondwanan terranes drifted northward toward Baltica and Laurentia. Replacement of the endemic fauna of these terranes by those of Baltic and Laurentian affinities by the end of the Middle Ordovician (e.g., Fortey and Cocks, 2003) suggests increasing proximity to these continents and a widening gap with Gondwana. Paleomagnetic data likewise suggest increasing separation from Gondwana, with Avalonia lying at least 2000 km to the north by the end of the Middle Ordovician (Hamilton and Murphy, 2004). This would necessitate a relatively rapid spreading rate (8-10 cm/y) for the opening Rheic Ocean, which suggests the involvement of slab pull (e.g., Murphy et al., 2006).’ Ibid. ‘[T]he Rheic Ocean was clearly one of the most important of the Paleozoic Era. It was formed with the separation of several ribbon terranes from the northern margin of Gondwana in the Early Ordovician, and widened at the expense of the Iapetus Ocean as the ribbon terranes, which separated the two oceans, drifted northward. Accretion of these terranes to, and the suturing of, Laurentia and Baltica by the Late Silurian effectively closed the Iapetus Ocean. Following this the Rheic Ocean lay between the paleocontinents of Laurussia and Gondwana, which were then separated by at least 4000 km.’ Ibid p 132-3. RoyAJac (talk) 05:41, 14 March 2018 (UTC) 14th March 2018 [RoyAJac]

A Commons file used on this page has been nominated for deletion

The following Wikimedia Commons file used on this page has been nominated for deletion:

• Caledonides EN.svg

Participate in the deletion discussion at the nomination page. —Community Tech bot (talk) 15:52, 17 February 2019 (UTC)

Life

https://www.bbc.co.uk/news/uk-wales-68005838 cheers, Michael C. Price ^talk 00:19, 22 January 2024 (UTC)