Yeats, R.S. 1985 Flexural-slip faulting in Grey-Inangahua depression, South Island: field guide to Giles Creek and Blackball scarps. Lower Hutt: New Zealand Geological Survey. New Zealand Geological Survey report EDS 99 19 p.
Abstract: Flexural-slip faults are produced by bedding slip accompanying flexural-slip folding of stiff beds alternating with thin, less stiff layers. Because they do not produce stratigraphic separation in the folded sequence, they are not likely to be recognised unless there is a sequence overlying the flexural-slip fold with angular unconformity, and continued folding causes displacement across the bedding of these younger deposits. The younger deposits are cut by faults that are parallel to bedding in the folded sequence and are upthrown toward the subjacent synclinal axis. The younger deposits may be tilted toward the synclinal axis. Flexural-slip faulting was first recognised (although not named) in the Grey-Inangahua depression, and these faults are among the best examples in the world. This report comprises a field trip guide to the Giles Creek and Blackball scarps so that they may be visited by others. The absence of gullying in these scarps suggests that their initial formation was coseismic. (auth)
