154 



PROCEEDINGS OP THE GEOLOGICAL SOCIETY. 



[Jan. 8, 



In Scania, in the neighbourhood of Helsingborg, &c, the strata of 

 Ehsetic age, which we have referred to as existing at Hogonas are 

 covered by a great series of beds of sandstone, micaceous shales, im- 

 pure lignites, and coals. These are said to attain, in places, a thick- 

 ness of 1000 feet. In the Prince -Charles Mines a pit has been 

 sunk to the depth of 280 feet, which passed through five beds of 

 coal, the first four being only from 4 to 6 inches thick ; but the 

 lowest, which, however, contains some intercalated seams of clay, is 

 upwards of 4 feet thick. The sandstones of Hor, too, which have 

 yielded a very interesting flora, are shown also to belong to the base 

 of the Lower Lias. This agreement in characters between the strata 

 of the same age in Scotland and Scandinavia, of which only such 

 isolated fragments now remain, is a point of great interest and sug- 

 gestiveness. 



§ 4. The Middle Lias. 



Reposing on the fossiliferous clays and limestones at Dunrobin, 

 which we have just described, we find a considerable thickness of 

 dark blue, very finely laminated and highly micaceous clays, contain- 

 ing a few thread-like concretions of pyrites, and very numerous, 

 small, and curiously shaped nodules of argillaceous limestone (see 

 fig. 14, /, page 143). At some distance from the base very large 

 septaria occur, and still higher a few irregular indurated bands con- 

 taining Oysters and Hippopodium ponderosum, Sow. 



The total thickness of clays seen here is about 80 feet, as estimated 

 from the dip and breadth of outcrop. To the north the shore is 

 altogether covered by great boulders. There is good reason, how- 

 ever, for believing that a great transverse fault occurs near here, which 

 brings the clays of the Middle Oolite, which are seen in the brickyard 

 and trial-pits at Clayside, against the clays of the Middle Lias. 

 The clay-beds, on the shore at Dunrobin, have yielded a considerable 

 number of fossils, sufficient, indeed, to place their age beyond ques- 

 tion ; these are recorded in the following list : — 



Fossils of the Middle-Lias Clays, Dunrobin Reefs. 



Belemnites acutus, Mill, (abundant, 

 but generally very small). 



clavatus, Scklotk. 



Ammonites brevispina, Sow. (not rare). 



Jamesoni, Sow., var. (rare). 



— — oxynotus, Quenst.,va,v. (very rare). 

 Helicina expansa ?, Sow., sp. 

 Turbo canalis, Goldf. 

 Pholadomya decorata, Goldf. 

 Pleuromya unioides, Bom., sp. 

 Cardinia lanceolata, Stutch., sp. 



attenuata, Sow. (rare). 



Hippopodium ponderosum, Sow., large 



rugose variety (very abundant). 

 Cardium truncatum ?, Sow. 

 Unicardium cardioides, Phil., sp. 

 Cucullsea Miinsteri, Goldf. 



Area Buckmanni, Bick. 



Mytilus (Modiola) numismalis, Oppel. 



Limea acutieosta, Goldf. 



Lima pectinoides, Sow., sp, (rare). 



, sp. 



Pinna folium, Y. $• B. 

 Pecten liasinus, Nyst. 



subkevis, Phil. 



■ priscus, Schloth. 



Plicatula spinosa, Sow. 



laevigata ?, B" Orb. 



Grypbasa cymbium, Lam. (G-. Maccul- 

 locbii, Sow.). 



obliqua, Sow., var. 



Terebratula punctata, Sow. 

 Rbyncbonella amaltbei, Querist. 

 Pentacrinus moniliferus, Qaenst. (rare) . 

 Wood in form of jet. 



