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*5* flcetz, ROCKS. 5. Certain kinds of fandftone are metalliferous. Where the old red-fandftone comes in contadl with the firft floetz-limeftone, which latter is remarkable for its abundance in ores, it is intermixed with ores of different kinds, and the fandftone is denomi- ' nated Sand-ore. The ores are copper-pyrites, cop- per-glance, variegated copper-ore, and cobalt. 6. Petrifadfions occur in great variety and quan tity in fandftone, but ftill not fo abundantly as in limeftone. Thus, in the red-fandftone of Kiff- haufer, we meet with trunks of trees perfedlly pe trified, and fimilar bodies in the fandftone of Bu- chau. The fandftone at Pirna, which we fhall de- fcribe afterwards, contains a variety of petrifac tions, particularly oftracites. Near M^ftricht, a vaft variety of petrifactions occur in fandftone. At Altfattel near Ellbogen, the fandftone contains numerous impreflions of leaves, that appear to belong to vegetables analogous to the elder and willow ; and thefe are accompanied with leaves of the nut-tree and with pine-cones. The fandftone in the neighbourhood of Aicha, Engilhaus, and other places near Carlfbad in Bohemia, contain nume rous trunks, roots, branches, and leaves of trees. In other parts of the fame country, we find large petrified trunks of trees, and fragments of wood- coal, even whole branches of trees nearly unal tered, being only flightly carbonized. Humboldt informs us, that in the very new fandftone forma tion that covers the northern and fouthern decli vity