Talk:Appalachian Mountains
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Shouldn't a map of the Appalachian Mountains featured in this article include more than just the extent of the range within the United States? They also extend into theMaritime provinces,St. Pierre and Miquelon, and the island ofNewfoundland, do they not? That means they lie within three countries—the U.S., Canada and a territory of France. A primary map ought to cover this extent. -Gilgamesh (talk)08:00, 19 November 2019 (UTC)[reply]
I removed France from the list of countries section. This correction was reverted I believe in error, possibly automatically. If a reason can be given, or if the correction can be reinstated, that would be great. Thanks! -BananaSepps (talk)23:25, 30 November 2022 (UTC)[reply]
The article leaves the reader confused about the Appalachian Mountains (a broad somewhat undefined mountain range in the eastern portion of North America, many times compared to theRocky Mountains) from theAppalachian Plateau, one of the25 physiographic provinces of the United States. Perhaps most importantly, as defined in the map shown, the Appalachian Mountains include theBlue Ridge Mountains that are over 1.2 billion years old compared to the Appalachian Plateau which is only 480 million years old.
Deanrah (talk)19:57, 13 August 2023 (UTC)[reply]
I propose removing this phrase:
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"The Appalachians first formed roughly 480 million years ago during theOrdovician Period. "
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Reason 1: In the definition implied in this article, the Appalachians are the entire system that includes theBlue Ridge Mountains that were formed during theGrenville Orogeny between 1.3 billion years ago and 1.0 billion years ago.
Reference:Birth of the Mountains: The Geologic Story of the Southern Appalachians.
A Supercontinent Forms
The rocks at the core of the Appalachian Mountains formed more than a billion years ago. At that time, all of the continents were joined together in a single supercontinent surrounded by a single ocean. Remnants of the supercontinent make up much of the North American core and are composed of minerals that are more than a billion years old. We can see fragments of the billion-year-old supercontinent (shown in red, fig. 5) at the surface in many places in the Appalachian Mountains. Examples include Blowing Rock in northern North Carolina and Red Top Mountain in northern Georgia.
Reason 2: There is no reference specifically to this sentence.
Reason 3: Current reference 4 one sentence laterdoes not say that the Appalachians were formed 480 million years ago. It says "The Appalachians, a heavily forested mountain range stretching more than 1500 kilometers from Georgia to Maine, were not always so tranquil. In fact, about 460 million years ago during the Ordovician period, they were the site of one of the most violent volcanic events in Earth's history. As the eastern edge of what became the North American continental plate overrode the basin of an ancient ocean, numerous volcanoes sprang up in what are today the Taconic Mountains of New York state and New England. The volcanoes spewed enough lava to form mountains as high and rugged as the Alps. They also belched out more carbon dioxide (CO2) than at any time in Earth's past, creating greenhouse-gas levels as great as 20 times higher than they are today."
Reason 4: Current reference 5 at the same place as reference 4 talks about the Smoky Mountains. These mountains are a section of the Blue Ridge Mountains. The second paragraph of that article says "Great Smoky Mountains National Park lies within the Appalachian Blue Ridge geologic and physiographic province. The highest mountains in eastern North America occur in the Blue Ridge province, and some of the highest peaks in this province are in the Great Smoky Mountains National Park. The oldest rocks in the Blue Ridge province are at least 1 billion years old and consist of metamorphosed sedimentary and igneous rocks. These Proterozoic rocks form the core of the ancient Appalachian Mountains. Sediments deposited over these older rocks form the majority of rocks in the Great Smoky Mountains National Park."
Deanrah (talk)20:54, 14 August 2023 (UTC)[reply]
Why is Ohio included in the infobox? It may be part of the plateau, but the Appalachian Mountains are not in Ohio. THERE ARE NO MOUNTAINS IN OHIO.173.90.75.20 (talk)01:30, 23 February 2025 (UTC)[reply]
It's easy to findreliable sources, e.g.,thisTEDickey (talk)02:06, 23 February 2025 (UTC)[reply]
That is a political/cultural reference. That is not a geographic one. Ohio's highest peak is Campbell Hill--639 feet in prominence. It is not a mountain. There are no mountains in Ohio.— Precedingunsigned comment added by173.90.75.20 (talk)02:57, 23 February 2025 (UTC)[reply]
