Two English impact structures?

Details Two English impact structures? Two English impact structures?

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jbaa..105..322s&link_type=abstract

Journal of the British Astronomical Association, Vol. 105, No. 6, p. 322

Mathematics

Logic

Meteorite Craters: Ages

Scientific paper

The author considers two circular structures, both in the Midlands of England. The first is the Ashby Anticline of southern Derbyshire and western Leicestershire, which brings up coal measures (Upper Carboniferous) through the Triassic cover to form the South Derbyshire Coalfield. This structure is about 16 km in diameter. The second circular structure lies southeast of the Ashby Anticline, and is a well-known geological feature-Charnwood Forest, in Leicestershire. The Precambrian outcrops of this area define an arc of a circle, about 14 km in diameter, centred about 4 km northwest of Markfield. The close proximity of the Ashby Anticline and Charnwood Forest implies that, if they are impact structures, they are probably the result of a double impact of Permian age (about 250 to 300 Myr old).

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