Question: What rocks located in the Great Smoky Mountains are the oldest?
About the article "Great Smoky Mountains National Park", section "Geology".

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Bote Mountain is a mountain in Great Smoky Mountains National Park of Tennessee, in the United States.
Bote Mountain is located in the Great Smoky Mountains, which began forming in the late Carboniferous and through the early Triassic, approximately .
The oldest rocks of the Great Smoky Mountains, however, date from the Neoproterozoic, approximately .
Those rocks are sedimentary rocks, and were deposited on an ancient ocean floor on the edge of a supercontinent.
Bote Mountain was named because of a misunderstanding when, in the 1830s, Cherokee workers were asked which route a new road would follow.
They pointed towards Bote Mountain and said "vote", which was interpreted by the white workers, who thought they were naming the mountain, as "bote".
Hence, the mountain was named "Bote Mountain".
The Bote Mountain Trail follows the crest of the mountain, and intersects the Appalachian Trail at Spence Field. 
Cataloochee is a valley in the Great Smoky Mountains of North Carolina, located in the Southeastern United States.
Now a recreational and historic area within the Great Smoky Mountains National Park, Cataloochee was once home to a substantial Appalachian community and Cherokee hunting ground. 
The majority of rocks in the Great Smoky Mountains National Park are Late Precambrian rocks that are part of the Ocoee Supergroup formation.
This group consists of metamorphosed sandstones, phyllites, schists, and slate.
Early Precambrian rocks are not only the oldest rocks in the park but also the dominant rock type in sites such as the Raven Fork Valley and upper Tuckasegee River between Cherokee and Bryson City.
They primarily consist of metamorphic gneiss, granite, and schist.
Cambrian sedimentary rocks can be found among the bottom of the Foothills to the northwest and in limestone coves such as Cades Cove.
One of the most visited attractions in the mountains is Cades Cove which is a window or an area where older rocks made out of sandstone surround the valley floor of younger rocks made out of limestone.
The oldest rocks in the Smokies are the Precambrian gneiss and schists which were formed over a billion years ago from the accumulation of marine sediments and igneous rock.
In the Late Precambrian period, the primordial ocean expanded and the more recent Ocoee Supergroup rocks formed from the accumulation of eroding land mass onto the continental shelf.
At the end of the Paleozoic era, the ocean deposited a thick layer of marine sediments which left behind sedimentary rock.
During the Ordovician period, the collision of North American and African plates initiated the Alleghenian orogeny that created the Appalachian range.
The Mesozoic era was dictated by the rapid erosion of softer sedimentary rocks and re-exposed the older Ocoee Supergroup formations.
The Smoky Mountains are part of the Rocky Mountains and located on the west side of the Wood River Valley near Sun Valley, Idaho, in the Western United States.
The range is within Sawtooth National Forest, while part of it is within the Sawtooth National Recreation Area.
The highest point in the range is Saviers Peak at .
The Smoky Mountains area closely surrounded by other mountain ranges including the Sawtooth Mountains to the northwest, Boulder Mountains to the north, Pioneer Mountains to the east, and Soldier Mountains to the south.
The Smoky Mountains are located within the watersheds of the Big Wood, Salmon, and Boise Rivers.
The mountains are most easily accessed from Idaho State Highway 75, although many unimproved and improved dirt road, including National Forest road 227, enter and cross the mountains.
The Smoky Mountains were named from the frequent forest fires in the mountains.
In 2007 the Castle Rock Fire burned 48,000 acres of the Smoky Mountains near Ketchum. 
Tremont is a region in the northwestern Great Smoky Mountains National Park, located in the southeastern United States.
Formerly home to a pioneer Appalachian community and logging town, Tremont is now the location of the Great Smoky Mountains Institute at Tremont.