fenster

Etymology
From, from.

Noun

 * 1)  A geologic structure formed by erosion or normal faulting on a thrust system; a tectonic window.
 * 2) * 1983, J. F. Evernden, R. E. Criss, William Jasper Sando,
 * Examination of strain data and cross sections suggests that the fensters expose rootless tectonic slices