. Geological magazine. cone open; d.open cone with seeds. (Heer, Figs. 155, 156, and 158, p. 324.) The genus Sequoia had a wide distribution in Tertiary times fromCentral Italy and Greece up to the Arctic zone. Sequoia Zangsdorfi isfound fossil on the Mac-kenzie Eiver, in Green-land, in Kamtschatka, inAlaska, and also in manyEuropean localities. Thisform is closely related tothe redwood (Sequoia sem-pervirens) which formsgreat forests at the presentday in the coast-range ofCalifornia, throwing upstems 250 feet high. TheMammoth-tree {Sequoiagi-gantea) is found only in thehigher Sierra, and is m
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. Geological magazine. cone open; d.open cone with seeds. (Heer, Figs. 155, 156, and 158, p. 324.) The genus Sequoia had a wide distribution in Tertiary times fromCentral Italy and Greece up to the Arctic zone. Sequoia Zangsdorfi isfound fossil on the Mac-kenzie Eiver, in Green-land, in Kamtschatka, inAlaska, and also in manyEuropean localities. Thisform is closely related tothe redwood (Sequoia sem-pervirens) which formsgreat forests at the presentday in the coast-range ofCalifornia, throwing upstems 250 feet high. TheMammoth-tree {Sequoiagi-gantea) is found only in thehigher Sierra, and is muchmore limited in its range than the other species, and is probablydying out, other and smaller Coniferee apparently far out-numberingit upon its own ground.^ It attains a height of 300-320 feet, anda diameter of 20-30 feet. Eemains of this genus are found in the 1 See the admirable Address by Prof. Asa Gray to the American Association atDubuque, Iowa, in SiUimans American Journal, 1872, 3rd series, vol. iv. p. 282.. Fig. 9. Sequoia Langsdorji: a. cone fromEixhoft; b. longitudinal section with seed; c.transverse section; d. seed; e. female flowers.From Greenland, 70° N. lat. (Heer, Fig. 158b, p. 329.) Reviews—Heer^s Primceval World of Switzerland. 87 Brown-coal of Bonn and in the Miocene Lignites of Bovey Tracey, and its ancestry has been traced back as far as the Cretaceous Period.At least twelve species of Palms have been met with in SwissMiocene deposits.