. Report of the fifty-fourth meeting of the British Association for the Advancement of Science [microform] : held at Montreal in August and September 1884. Congresses and conventions; Science; Congrès et conférences; Sciences. Anglesey occupy three areasâone, a strip roughly parallel with tlio Menai Straits, extending from the western to the eastern shore, consist- ing mainly of micaceous or chloritic schists, with some rather deciuedly crystalline hornblendic schists; another (in. which the gran-ioid rocks are included), extending fi'om tiie western shore at Porth Nobla, nciir Ty Croes and
. Report of the fifty-fourth meeting of the British Association for the Advancement of Science [microform] : held at Montreal in August and September 1884. Congresses and conventions; Science; Congrès et conférences; Sciences. Anglesey occupy three areasâone, a strip roughly parallel with tlio Menai Straits, extending from the western to the eastern shore, consist- ing mainly of micaceous or chloritic schists, with some rather deciuedly crystalline hornblendic schists; another (in. which the gran-ioid rocks are included), extending fi'om tiie western shore at Porth Nobla, nciir Ty Croes and LLinfaelog, about two-thirds way across the island, with sundry outcropping patches to the north-east which show that an Archieaii floor underlies the Palu'o/.oif rock right up to the eastern shore; and. lastly,a rudely triangular patch, cousistiiig of the island of Holyhead, and a still larger tract on the adjacent mainland. (i) That at the base of the indubitably Pakeo/oic scries, there is in many places a conglomerate which contains fragments of tlie granitoid rock, liie schists, and the schistose or slaty beds of the ' metamorpliic Cambrian ar . Lower Silurian region' of the Survey. Hence, that whctluT this conglomerate is Cambrian, as is the opinion of Professor Hughes nvi] Dr. Hicks, or very low down in tlie Ordovician, as seems to bo the view nl' Dr. Callaway,' there is a very important break between it and the ' nu'f;i- morphic series,' in Avhich also the upper member contains pebbles of the lower. ((â ) The greater antiquity of the granitoid series and its non-intrnsive character is placed beyond doubt by the foUov^ing section : - Near Llaii- faelog the gi'anitoid series and the so-called Lower Silurian can be .seen iii close proximity "^ and traced for a considerable distance. Not only uiv grits in the latter formed of debris closely resembling the constituents o!' the former, but also there are occasionally bands of well-rounded peblil">, sometimes
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectscience, bookyear1885
