Gerald M. Friedman; Supposed fossil from the Charnian. Geological Magazine ; 87 (6): 441. doi:
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A tubular object composed of chlorite and resembling a worm tube, found in slate interbedded in quartzite of the pre-Cambrian Brand series, Charnwood Forest, Leicestershire, England, is described, and the possibility of its inorganic origin noted.
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