grauwacke

We rode over mountainous ground, where the sand-stone again appears among the grauwacke and feldspath, until, at two hours and a half from Kolbe, we reached Wady Dal (وادي دال), which may be called the southern extremity of the Batn el Hadjar.

Travels in Nubia 2004

Wady Halfa, changes its nature at the second Cataract, where grunstein and grauwacke predominate; these primitive rocks continue throughout the Batn el Hadjar.

Travels in Nubia 2004

The excavation consists of a passage cut nearly north and south (the entrance being to the south) through various strata of solid rocks, partly grauwacke, (or what is there called _whinstone_), and partly grey slate: the strata lying east and west, and nearly vertical.

Notes and Queries, Number 208, October 22, 1853 A Medium of Inter-communication for Literary Men, Artists, Antiquaries, Genealogists, etc Various 1852

That region presents a very remarkable loxodromism with the strata of mica-slate, grauwacke, and the orthoceratite limestone of the Alleghenies, and that vast extent of country (latitude 56 to 68°) lately visited by Captain Franklin.

Travels to the Equinoctial Regions of America 1851

The Alleghenies, generally composed of grauwacke and transition rocks, are somewhat loftier than the almost primitive mountains (of granite, gneiss and mica-slate) of the Brazilian group; they are also of a far more simple structure, their chains lying nearer to each other and preserving, as in the Jura, a more uniform parallelism.

Travels to the Equinoctial Regions of America 1851

Complex and parallel formations; (a) Alternate beds of grey and stratified limestone, anthracitic mica-slate, anhydrous gypsum and grauwacke; (b) clay-slate, black limestone, grauwacke with greenstone, syenite, transition-granite and porphyries with a base of compact felspar; (c)

Travels to the Equinoctial Regions of America 1851

I could discover no fragmentary stratum (grauwacke) nor kieselschiefer nor chiastolite.

Travels to the Equinoctial Regions of America 1851

The geological formation of the Parime group is consequently still more simple than that of the Brazilian group, in which granites, gneiss and mica-slate are covered with thonschiefer, chloritic quartz (Itacolumite), grauwacke and transition-limestone; but those two groups exhibit in common the absence of a real system of secondary rocks; we find in both only some fragments of sandstone or silicious conglomerate.

Travels to the Equinoctial Regions of America 1851

Formations of quartzose porphyry, pyroxenic porphyry and trachyte, of grauwacke, muschelkalk and quadersandstein, which are frequent towards the west, have not yet been seen in Venezuela; but it may be also observed that in the system of secondary rocks of the old continent muschelkalk and quadersandstein are not always clearly developed, and are often, by the frequency of their marls, confounded with the lower layers of Jura limestone.

Travels to the Equinoctial Regions of America 1851

[* In Galicia, in Spain, I saw the thonschiefer containing chiastholite alternate with grauwacke; but the chiastolite unquestionably belongs also to rocks which all geologists have hitherto called primitive rocks, to mica-schists intercalated like layers in granite, and to an independent stratum of mica-slate.] 3.

Travels to the Equinoctial Regions of America 1851