Abstract
The Glasford structure was recognized as a dome in the 1950s, while exploration for coal was occurring in the region. The top of the dome was found to be at a depth below the surface of 350 m. The local power company took several cores and had a gravity map constructed for the purposes of considering the dome for underground storage of natural gas. These showed that the structure was a local uplift in which denser, lower rocks had been brought closer to the surface. The cores indicated that this uplift consisted of highly deformed rocks, with large, randomly oriented blocks mixed together in a matrix of finer brecciated material. A complex pattern of faulting further suggested that the dome might be the central uplift of an impact crater. Later discovery of shatter cones in blocks of fractured dolomite places this hypothesis on firmer ground (McHone et al. 1986).
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Reference
McHone, J. F., Sargent, M. L., & Nelson, W. J. (1986). Shatter cones in Illinois: Evidence for meteoritic impacts at Glasford and Des Plaines. Meteoritics, 21, 446.
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Flamini, E., Coletta, A., Battagliere, M.L., Virelli, M. (2019). Glasford, USA. In: Flamini, E., Di Martino, M., Coletta, A. (eds) Encyclopedic Atlas of Terrestrial Impact Craters. Springer, Cham. https://doi.org/10.1007/978-3-030-05451-9_142
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DOI: https://doi.org/10.1007/978-3-030-05451-9_142
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