A reinterpretation of the concealed Variscan structure beneath southern England by section balancing

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Abstract
Recently, Chadwick et al. 1983 presented an interpretation of the concealed Variscan structure beneath southern England based on deep seismic reflection profiles. We re-evaluate the status of reflection events identified along some of the profiles and draw attention to major uncertainties in the interpretation presented. The geological section of Chadwick et al. is admissible in that it portrays similar structures to those seen to the west in the Mendips. However, the section is not a valid balanced section as it cannot be restored to a pre-thrusting stratigraphy. Using the published seismic reflection data and borehole information, we present a new balanced cross-section of the Variscan structures for which a total tectonic shortening of about 20% is calculated.