(geology) A geologic structure formed by erosion or normal faulting on a thrust system; a tectonic window.
1983, J. F. Evernden, R. E. Criss, William Jasper Sando, https://books.google.com/books?id=A8RRAQAAMAAJ&pg=RA1-SL1-PA1&dq=%22fensters%22+tectonic&hl=en&sa=X&ved=0ahUKEwipqvOA0bvRAhXIrVQKHaB3BoUQ6AEIGjAA#v=onepage&q=%22fensters%22%20tectonic&f=false
Examination of strain data and cross sections suggests that the fensters expose rootless tectonic slices […]
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