Geological Society. 229 



assuming, that the granite comes near the surface, and that by its 

 agency the gray wacke has been thrown into a trough, and its lo.west 

 beds so brought up as to be made to rest against inverted beds of 

 the coal measures. Proceeding in the line of section, the author 

 found in gray wacke shale, portions of a Trinucleus, Trilobites or- 

 natus. (Trans. Prague National Mus. Soc. 1833.*) 



The graywacke shell extends with contorted strata to an anti- 

 clinal hill of limestone, beyond which occur broken and rotten 

 shales, then limestone, next shales again, and lastly the picturesque 

 limestone hill of Karlstein. Further south is a valley of graywacke 

 bounded by an altered rock, which is succeeded by granite. The 

 Karlstein limestone is stated to be identical with that at Ginetz, 

 (see section 3) and the two other localities in the present line of 

 section. It is of a pale blue colour, very hard, contains several species 

 of Orthocera and Trilobites, and is of great ceconomical importance. 

 The recurrence of the same limestone at different points, Mr. Ansted 

 explains, by supposing, that the granite in these cases, is also near 

 the surface, and that a displacement of it bent the yielding shales, 

 but snapt asunder a brittle band of limestone once continuous, the 

 portions of which, not removed by subsequent operations, are ex- 

 hibited at the points mentioned in the line of section ; and that the 

 consequences of these operations have been, a disturbance in the re- 

 gular succession, and an exhibition of the beds in the following order : 

 granite, altered rocks, newest graywacke with limestone, oldest gray- 

 wacke, coal measures. 



In conclusion, Mr. Ansted offers the following observations as the 

 results of his examination of this portion of Bohemia. The gray- 

 wacke series is imperfectly developed, presenting at only one spot a 

 passage upwards into the carboniferous series, and no passage down- 

 wards into the graywacke, resting always unconformably upon it ; 

 the secondary rocks are also very imperfectly developed, the mountain 

 limestone being absolutely wanting, and the only indications of 

 beds newer than the coal measures being a red conglomerate, into 

 which they pass upwards. The flora of the coal measures is how- 

 ever well known to be rich, and to have yielded near Radnitz the 

 fossils described by Count Sternberg. A genus allied to Scorpio is 

 also stated to have been found in them. The fossils of the gray- 

 wacke are said to be not very numerous ; but the Trinucleus ap- 

 pears to be abundant on the line of road between Prague and Pilsen ; 

 and in a gorge near Lodentz, about fourteen miles from Prague, is 

 a quarry which yields shells and other organic remains ; and on the 

 opposite side of the road, near the same spot, similar fossils may be 

 obtained. Trilobites occur at Ginetz, and Orthocera at Karlstein ; 

 and both these localities and the neighbourhood of Prague are men- 

 tioned as rich in organic remains. The Trinucleus Caractaci is 

 stated to occur near Zebrak.f 



* Impressions of shells were also found by the author in a grayish sand 

 rock, a little nearer Prague; and the Trinucleus is found at Zebrak and 

 Praskoles, on the south side of the high road about 10 miles south of Beraun. 



t See the fossils of Caradoc sandstone, Silur. Syst. pi. 23, f. 1. 



