Wrinkle Marks

Wrinkle marks are small, irregular load structures.   They form in much the same way as load casts, but are much smaller.

	Flute casts can be seen on the base of the foreground bed in this image, but the small, irregular features seen on the bases of the background beds are wrinkle marks.
	Closer view of wrinkle marks.  Note the irregular habit displayed by the bed surface, that looks similar to a crinkled sheet of paper.