].57 



upper Pecten bed of the Garden Cliff section, &c., this band 

 rests upon another bed of black shales, 8 feet in thickness, 

 containing seams of shells. Here are found Avicula contorta, 

 Cardium Rhceticum, Pullastra arenicola, Axinus, Anomia, &c. 

 The fossils are very mnnerous, but much compressed, and 

 determined with difficulty. The Contorta shales rest upon a 

 second, or lower, Pecten bed, consisting of a hard grey shelly 

 Limestone, 8 inches thick, containing Avicula contorta, Cardium 

 Rhceticum, Pullastra, Axinus, Anomia, &c., in fact, all the same 

 shells that are found in the black shales above. Beneath the 

 Limestone band is another bed of black shales, 4 feet thick, 

 intersected by thin, inconstant, indurated bands, containing 

 fishes' scales, &c. The shales rest upon the true Bone-bed, 

 which is here a most remarkable band of dark grey, crystalline, 

 calcareo-siKceous rock, containing nodules of marl, masses of 

 dark coproKtic matter, bones of saurians, teeth of ceratodi and 

 other fishes, in fine preservation. Its thickness varies from 2 

 to 8 inches; and it rests upon a thm band of dark shales, 

 to which succeeds a yard of grey sandy marls, containing hard 

 concretionary nodules ; beneath are bands of hard sandy marl, 

 resting upon 8 feet of pale grey arenaceous marls, having at 

 their base a nodular band of similar marls, passing into a thick 

 bed of sandy Marlstone, 6 feet 6 inches thick, and forming the 

 base of the Avicula contorta series, which rests upon nodular 

 greenish marls, thick bedded and red striped, fourteen feet thick, 

 and next a thick mass of marls, having a conchoidal fracture, 

 62 feet thick; then follow the gypsiferous series, containing 

 fibrous gypsum, in string-like lines, 25 feet 6 inches, having at 

 the base 20 feet of red sandy marls, — the whole resting upon 

 highly inchned strata of the lower portion of the carboniferous 

 Limestone, which here forms the bed of the Severn. 



The special character of this section consists in the great 

 development of its Bone-bed, and the number of large teeth 

 belonging to the genus Ceratodus that have been obtained here. 

 Mr. HiGGiNS, of Birkenhead, who has made the largest collection 

 therefrom, reckons that he has found at Aust 140 different 

 forms of teeth belonging to this singular genus. 



