Elements of geology, or, The Elements of geology, or, The ancient changes of the earth and its inhabitants as illustrated by geological monuments elementsofgeolog00lyel Year: 1868 522 MOUNTAIN LIMESTONE. [Ch. XXV. Fig. 5S3. be restricted to a very few species, among which Textularia, Nodo- saria, Undothyra, and Fusulina (fig. 583), have 'been recognized. The first two genera are common to this and all the after periods; the third has been found in the Upper Silurian, but is not known above Fumiina cyiin- the Carboniferous strata; the fourth (fig. 583) is drica, D'Orb. peculiar to the Mountain
Elements of geology, or, The Elements of geology, or, The ancient changes of the earth and its inhabitants as illustrated by geological monuments elementsofgeolog00lyel Year: 1868 522 MOUNTAIN LIMESTONE. [Ch. XXV. Fig. 5S3. be restricted to a very few species, among which Textularia, Nodo- saria, Undothyra, and Fusulina (fig. 583), have 'been recognized. The first two genera are common to this and all the after periods; the third has been found in the Upper Silurian, but is not known above Fumiina cyiin- the Carboniferous strata; the fourth (fig. 583) is drica, D'Orb. peculiar to the Mountain Limestone, and is charac- Magnified 3 diain. ^^ q£ ^ formation in the United gtates Arctic Mountain Lime- . . . stone. America, Russia, and Asia Minor. STRATA CONTEMPORANEOUS WITH THE MOUNTAIN LIMESTONE. Fig. 5S4. In countries where limestone does not form the principal part of the Lower Carboniferous series, this formation assumes a very differ- ent character, as in the Rhenish Provinces of Prussia, and in the Hartz. The slates and sandstones called Kiesel-schiefer and Younger Greywacke (Jungere Grauwaeke) by the Germans, were formerly re- ferred to the Devonian group, but are now ascertained to belong to the ' Lower Carboniferous.' The prevailing shell which character- izes the carbonaceous schists of this series, both on the Continent and in England, is Posidonomya Becherl (fig. 584). Some well-known moun- tain-limestone species, such as Go- niatites crenistria (see fig. 579), and G. reticulatus, also occur in the Hartz. In the associated sandstones of the same region, fossil plants, such as Lepidodendron and the allied ge- nus Sagenaria, are common; also Knorria, Calamites SucJcovii, and C. transitionis, Gopp., some peculiar, others specifically identical with ordinary coal-measure fossils. The true geological position of these rocks in the Hartz was first deter- mined by MM. Murchison and Sedgwick in 1840.* Posidonomya Becheri, Gold, Syn. Estheria Becheri. Lower Carbo
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