Response to: E. J. Heidecker's discussion of Talundilly, Western Queensland, Australia: geophysical and petrologic evidence for an 84 km-large impact structure and an Early Cretaceous impact cluster by J. D. Gorter and A. Y. Glikson (2012)

1. The distinction between planar features in quartz formed by impact-generated shock metamorphism and those formed by tectonic processes. Heidecker (2012) writes: ‘Quartz deformation lamellae generated experimentally at low strain rates are shown to be very similar in geometric detail to quartz microstructures that Gorter & Glikson (2012, figure 16a) consider indicative of shock deformation during meteorite impact.’ 2. The origin of the central uplift and rim syncline of Talundilly by either impact-generated rebound or by tectonic processes. Heidecker comments include a remark on ‘Petrological indications of abundant gases (Gorter & Glikson 2012, p. 61).’

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