Date Note | Letter from Conybeare GSL/MUS/1/4/6 sending specimens from St Agnes, dated 1812 |
Publication Note | Relates to paper read before the Society 3 December 1813 and published as: Conybeare, J J, "Memoranda relative to the Porphyritic Veins, &c. of St. Agnes in Cornwall", 'Transactions of the Geological Society of London', Series 1, Vol 4 (1817), pp401-403, plate 23. |