Baja folds

These are migmatitic gneisses associated with the Baja plutonic complex. The light bands of a migmatite (the leucosome) are thought to have been molten, while the host darker bands (here a biotite schist) were solid, albeit hot at elevated metamorphic conditions. The folds are the obvious features here. Note and trace the nature of their geometry. Also try to find and trace any truncation surfaces within the the gneissic layering.

Questions that may be raised are as follows. How can this fold geometry be characterized, or even quantified? Why do the folds have the distinctive geometry they do?

Link to interpreted version.

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