REFOLD: a FORTRAN 77 program to construct model block diagrams of multiply folded rocks

Abstract REFOLD, an interactive FORTRAN 77 program, suitable for use on a microcomputer, constructs model 30° isometric block diagrams of strata affected by two episodes of folding. The two sets of folds are represented by sinusoids of variable amplitude, wavelength, and in the situation of F 1 folds, orientation. The diagrams are in line files for copying to a monitor or lineprinter. The program can be used to advantage by students in first-year laboratory classes and by field geologists trying to determine and visualize structure in complexly folded terranes.