I 4 s TRANSITION ROCKS. .• '• 2. Tranfition-Trap. Uebergangs Trap.—Werner. This rock appears to be older than grey-wacke, and in fome degree connected with tranfition-lime- ftone. It is intermediate between primitive and floetz trap. It contains greenftone and amygda loid. The greenftone is lefs cryftalline than the primitive, but more cryftalline than the floetz greenftone. It is feldom porphyritic. The amyg daloid approximates it to the neweft floetz-trap formation, from which, however, it is diftinguilh- ed by the abfence of porphyry-flate, grey-ftone, bafalt, gravel, fand, clay and loam. We have principally two rocks in this forma tion to make ourfelves acquainted with, namely, Greenftone and Amygdaloid. I. T’ranjition-Greenjlone. This is a fine granu lar mixture of hornblende and felfpar ; and fome- times the mixture is fo intimate, that the confti- tuent parts are not to be diftinguiftied. Quartz fometimes traverfes it in the form of veins, or is difleminated through it; a chara&er which di- ftinguilhes it from flaetz-greenftone, which rarely contains quartz. Sometimes it occurs in globular diftindt concretions, and thefe again of curved la mellar concretions, forming the Globular Rock (Kugelfels) of Voigtland. Sometimes it is penetrated with reddifh-brown oxide of iron, which, com bined with the dark green colourof the hornblende, gives