In his important paper on the Physical Structure of West Somerset and North Devon (Quart. Journ. Geol. Soc., vol. xxiii. p. 568), Mr. Etheridge incidentally refers to a felstone at Bittadon, saying of it (p. 609): “There is no proof that the igneous rock at Bittadon is eruptive.” At the time when these words were written, it was undoubtedly impossible, from the nature of the exposure, to decide whether the rock was intrusive or interbedded; but, on visiting the locality in September, 1876, I found that a small quarry (for road metal) had been opened in the felstone, and its relations to the sedimentary rocks were pretty clearly exposed.