Question: What formations were re-exposed in the Mesozoic era?
About the article "Great Smoky Mountains National Park", section "Geology".

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Como Bluff is a long ridge extending east-west, located between the towns of Rock River and Medicine Bow, Wyoming.
The ridge is an anticline, formed as a result of compressional geological folding.
Three geological formations, the Sundance, the Morrison, and the Cloverly Formations, containing fossil remains from the Late Jurassic of the Mesozoic Era are exposed.
Nineteenth century paleontologists discovered many well-preserved specimens of dinosaurs, as well as mammals, turtles, crocodilians, and fish from the Morrison Formation.
Because of this, Como Bluff is considered to be one of the major sites for the early discovery of dinosaur remains.
Among the species discovered is the only known specimen of "Coelurus".
Significant discoveries were made in 22 different areas scattered along the entire length of the ridge.
It is included on the National Register of Historic Places as well as the National Natural Landmark list. 
Roxborough State Park is a designated Colorado Natural Area and National Natural Landmark for its 300 million year old red sandstone Fountain Formation that tilt at a 60 degree angle.
The park includes great examples of exposed Precambrian to Late Mesozoic hogback, monolithic and spire formations from the Permian, Pennsylvanian and Cretaceous age.
Carpenter Peak's exposed granite is from Precambrian era. 
The Great Valley Sequence of California is a -thick group of related geologic formations that are Late Jurassic through Cretaceous in age (150–65 Ma) on the geologic time scale.
These sedimentary rocks were deposited during the late Mesozoic Era in an ancient seaway that corresponds roughly to the outline of the modern Great Valley (Central Valley) of California. 
The geology of the Zion and Kolob canyons area includes nine known exposed formations, all visible in Zion National Park in the U.S. state of Utah.
Together, these formations represent about 150 million years of mostly Mesozoic-aged sedimentation in that part of North America.
Part of a super-sequence of rock units called the Grand Staircase, the formations exposed in the Zion and Kolob area were deposited in several different environments that range from the warm shallow seas of the Kaibab and Moenkopi formations, streams and lakes of the Chinle, Moenave, and Kayenta formations to the large deserts of the Navajo and Temple Cap formations and dry near shore environments of the Carmel Formation.
Subsequent uplift of the Colorado Plateau slowly raised these formations much higher than where they were deposited.
This steepened the stream gradient of the ancestral rivers and other streams on the plateau.
The faster-moving streams took advantage of uplift-created joints in the rocks to remove all Cenozoic-aged formations and cut gorges into the plateaus.
Zion Canyon was cut by the North Fork of the Virgin River in this way.
Lava flows and cinder cones covered parts of the area during the later part of this process.
Zion National Park includes an elevated plateau that consists of sedimentary formations that dip very gently to the east.
This means that the oldest strata are exposed along the Virgin River in the Zion Canyon part of the park, and the youngest are exposed in the Kolob Canyons section.
The plateau is bounded on the east by the Sevier Fault Zone, and on the west by the Hurricane Fault Zone.
Weathering and erosion along north-trending faults and fractures influence the formation of landscape features, such as canyons, in this region. 
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.