From Mount Conybeare, in the Buckland Chain.
356 Greenish-gray grauwacke slate, (resembling No. 348,) with specks of effervescent carbonate of lime. The surfaces of the slates exhibit interspersed scales of mica. The specimens were broken from the summit of Mount Conybeare, at the western extreme of the Buckland Chain: latitude 69° 27', longitude 139° 53' west.
358 Fine-grained grauwacke-slate in columnar concretions, from the same place with specimen 356.
357 Grauwacke-slate, in thick slaty columnar concretions, besprinkled with scales of mica. Taken from a bed about the middle of Mount Conybeare. The resemblance of this stone to that of Mount Fitton (No. 344) is very remarkable.
360 Similar rock to 358, with an adhering portion of a vein of crystallized quartz, and on one side a bit of bluish-gray slate. From the middle of Mount Conybeare.
359 Columnar concretion of a slaty rock, like 356, but more quartzose, breaking into rhomboidal fragments. From the middle of Mount Conybeare.
361, 362 Grauwacke-slate, with a thin adhering vein of carbonate of lime and numerous particles of disseminated mica. From the middle of Mount Conybeare.
363 Bluish-gray grauwacke-slate, resembling Nos. 348 and 344. From the Upper Terrace, at the base of Mount Conybeare.
364 Dark-bluish gray and very fine-grained grauwacke-slate, with a glimmering lustre, traversed by a vein of quartz. From the same place.
365 A thick-slaty angular concretion of a very quartzose grauwacke-slate, (similar to Nos. 348 and 358,) decomposed on the surface and breaking into rhomboidal fragments. From the middle Terrace at the base of Mount Conybeare.