The Quarterly journal of the Geological Society of London . Tyf>o. Etching Co. Sc Quait. Journ. Geol. Soc. Vol. LI. PI. Vol. 51.] OP A JOURNEY IN MADAGASCAR. 71 on the sea-shore near Belfast in the north of Ireland. Here it maybe mentioned also that an interesting rock allied to Rosenbuschscamptonite, together with an andesite, occurs east of the village ofJangoa (long. 48° 19 E., lat. 13° 40 8.). We see, therefore, that in this north-western part of Madagascarboth intermediate and basic lavas occur, consisting of trachyte,phonolite, haiiyne-nepheline-phonolite, andesite (rare), basalt,
The Quarterly journal of the Geological Society of London . Tyf>o. Etching Co. Sc Quait. Journ. Geol. Soc. Vol. LI. PI. Vol. 51.] OP A JOURNEY IN MADAGASCAR. 71 on the sea-shore near Belfast in the north of Ireland. Here it maybe mentioned also that an interesting rock allied to Rosenbuschscamptonite, together with an andesite, occurs east of the village ofJangoa (long. 48° 19 E., lat. 13° 40 8.). We see, therefore, that in this north-western part of Madagascarboth intermediate and basic lavas occur, consisting of trachyte,phonolite, haiiyne-nepheline-phonolite, andesite (rare), basalt, andoli vine-basalt. At Ambavatoby, a small bay on the mainland south-west of theisland of Nosibe, coal of excellent quality is said to have beenobtained (see Annales des Mines, 1854, 1856, 1866). I visitedall the points in this bay where coal is said to exist, and could findnothing but thin seams of carbonaceous shale intercalated among(Jurassic ?) sandstones. What there may be below the surface Icannot of course say, but am strongly inclined to doubt altogetherthe existence of coal. This carbonaceous shale, it may be
Size: 1597px × 1565px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1840, bookidquarte, booksubjectgeology
