variety of mica slate, being composed of granular felspar, interlaminated with mica. It contains beds of dark purple felspar rock, very similar to that which abounds in the mining district in the western part of the county. This micaceous slate gradually passes into a thick lamellar rock, which extensively disintegrates and becomes argillaceous, exactly resembling the stone quarried for building at Bodmin.
Bridgerule is situate in the hundred of Stratton, i. e. street or highway town. Now the part of the parish that is on the north side of the river Tamar, hath upon the north Launcells, west Marham Church, south Whitstone, east the Tamar river. The church stands on the Devonshire side, in the Halisworthy hundred, so that this rule or dominion of the Bridge extendeth itself into both counties, as to spirituals and temporals. In the Valor Beneficiarum, it is called Brige Rowell. Ecclesia de Bridge Rule, in Decanatu de Stratone, was taxed to the Pope's annats, in 1294, at vl. iiis. 8d. Vicar ibidem nihil propter paupertatem. In Wolsey's Inquisition it was taxed at 14l., and the parish was rated to the 4s. land-tax, in 1696, at 45l. 3s.
At the time of the Domesday Roll, 20 W. Conq. this district was taxed under the name of Tacabere, which place is now the dwelling place of Mr. Samuel Gilbert.
Mr. Risdon, in his History of Devon, part ii. p. 298, gives the true etymology of this place, in those words, "Bridge Renold, of the vulgar Bridge Rule, anciently