FOLDS - ANTICLINES & SYNCLINES
Description: Folds are bends in the rock caused by compressional forces. Upfolds are referred to as Anticlines while downfolds are called Synclines. The very top of a fold is called its Crest. The bottom of a syncline is called a Trough. The sides of the folds are called Limbs. If the limbs dip in the same direction, the fold is said to be Overturned.
Figure 1 - FOLDS IN THE OQUIRRH FORMATION, UT. Pennsylvanian. Found on US 89 between Provo and Ogden, Utah
Figure 2 - FOLDS IN THE LODGEPOLE MEMBER OF THE MADISON FM. Mississippian. Laketown Canyon, UT
Figure 3 - Overturned Anticline. Swift Fm. (UJ) over Swift Fm. (MJ). Found near Sun River Canyon in northwestern Montana. Red line marks the axis of the fold