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Interfold, in-tėr-fold′, v.t. to fold one into the other.

Instead of the supposed fluffy cotton, we now discover the white substance to be of firm though somewhat sticky consistency, its surface, moreover, beautifully ridged from base to summit in parallel rounded flutings, which meet and interfold like a braid along the summit.

The marly or calcareous beds not only come up nearly horizontally to the northern and southern foot of the great quartzose mountains of the Sierra Ventana, but interfold between the parallel ranges.