Yes they are.
reverse fault
it depends on which mountain in the rocky mountains
The Rocky Mountains,and Seirra Nevada in the USA
nope fault block
Fault-block mountains
The Appalachian Mountains are a divergent boundary.
Fold Mountains (Folded Mountains)Fault-block Mountains (Block Mountains)Dome MountainsVolcanic MountainsPlateau Mountains
They are dome(up-warped) mountains
They are fault-block mountains.
Fault block mountains
The five types of mountains are fold mountains (e.g. the Rocky Mountains), fault-block mountains (e.g. the Sierra Nevada), volcanic mountains (e.g. Mount St. Helens), dome mountains (e.g. the Black Hills), and plateau mountains (e.g. the Colorado Plateau).
A fault-block mountain can be found in Death Valley, California and also in the Sierra Nevada mountains in California. Movement of large crustal blocks form fault-block mountains.