The Quarterly journal of the Geological Society of London . ne, a baked shale, is irregularlyoverlain by the amyj^daloidal diabase, and in this is a band of stillmore altered De\onian. Microscopic examination of this rockshows that it was once a shale with a few layers of grit, and that it VARIOLITIC DIABASE OF THE FICHTELGEBIRGE. 55 has been crushed and minutely faulted. This case is further ofinterest as there is no variolite along the contact with the equally clear section occurs in a small quarry in line with thewaggon-ford that crosses the stream just above the second foot-bri
The Quarterly journal of the Geological Society of London . ne, a baked shale, is irregularlyoverlain by the amyj^daloidal diabase, and in this is a band of stillmore altered De\onian. Microscopic examination of this rockshows that it was once a shale with a few layers of grit, and that it VARIOLITIC DIABASE OF THE FICHTELGEBIRGE. 55 has been crushed and minutely faulted. This case is further ofinterest as there is no variolite along the contact with the equally clear section occurs in a small quarry in line with thewaggon-ford that crosses the stream just above the second foot-bridge. The section is composed of a mass of spheroidal varioiiticdiabase, and across it runs a band of baked shale which thinstowards, and forks at, the lower and north end. Here, again, thediabase is neither varioiitic nor spheroidal at the actual contact withthe shale, but acquires these structures at about one foot from it. Fig. 5.—Section of the normal compact Diabase from the Oelschnitz- 80thai, with a vacuole Jilled with chlorite. ( x -Z See p. 50.). The junctions of this diabase and the neighbouring Devonians areobscured, but the latter occur in mass a few yards away. It is unnecessary to trace the junctions of the diabase and theDevonians further through the area. On the opposite side of theMetziersreutherbach, in the bank of the same stream near Heiners-reuth, in the wood south of Mej^erhof, and in other places, the samefeatures are repeated. The relations of the diabase to the of Berneck are, however, worth consideration ; the junction canbe seen in the road that rises steeply up the west bank of thevalley which leads to Micheldorf, a little south of the quarry. Thetwo rocks are certainly faulted against one another, and hence wesearch in vain in the crushed and brecciated diabase for any traceof the variolite. The evidence adduced is sufficient to show, at least in the case ofthe area south of the Oelschnitz and the Metziersreutherbach, that,though the
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Keywords: ., bookcentury1800, bookdecade1840, bookidquarte, booksubjectgeology
