File:Robert Plot - Natural History of Staffordshire 1686 - quadrangular cropmark.png

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Summary

Description	English: Plate from Natural History of Staffordshire (1686) by Robert Plot. Circle in a field near to St Giles' Church, Oxford. The cloud and the horn demonstrates Plot's hypothesis that circles are caused by lightning. Description by Robert Plot: …They are rarely also seen of a quadrangular forme, encompassed with another larger of the Circular kind, whereof there were shewn to me no less than two examples by my Ingenious and observing friends John Naylor and Hugh Todd M.M.A.A. and fellows of the University Colledge in the same St.Gile's fields: which may be yet reconcilied to the same Hypothesis; the former proceeding from thre different flashes, the second widening of the orifice of the cloud more than the first and the third more than the second, and so frequently the Circles; the latter from the clouds breaking first in a quadrangular, and after in a wider circular forme.… In the modern view, this drawing shows a cropmark, but some cereologists conjectures that this is a historic crop circle.
Date	1686
Source	Robert Plot (1686) Natural History of Staffordshire, Oxford . Retrieved from http://www.bltresearch.com: Page, Image, cleaned up & converted to grayscale
Author	Unknown authorUnknown author

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	07:53, 11 June 2010		300 × 311 (6 KB)	Trycatch	cleanup
	15:50, 13 February 2010		300 × 311 (18 KB)	Trycatch	{{Information \|Description={{en\|1=Plate from ''Natural History of Staffordshire'' (1686) by Robert Plot. Circle in a field near to St Giles' Church, Oxford. The cloud and the horn demonstrates Plot's hypothesis that cir