ORGANIC REMAINS OF THE CARBONIFEROUS LIMESTONE. 



161 



England and of South Wales into an upper zone which is productive of coal, and a lower 

 in which no traces of the mineral have been discovered, will in the sequel assist us in 

 establishing important inferences, concerning the age of the cw/ra-bearing rocks of 

 Pembrokeshire and Devonshire. 



The undermentioned fossils have been found in the carboniferous limestone of Shropshire, Mon- 

 mouthshire and South Wales : 



Chief Localities. 

 Coal Brook Dale 

 and Oswestry. 

 Clee Hills, &c. 

 r Salop and South 

 I Wales. 



costatus 1 . Phill. pi. 7. f. 2. ... Oswestry, &c. 

 margaritaceus. Phill. pi. 8. f. 8.' 



setosus. Phill. pi. 8. f . 9 



punctatus. Phill. pi. 8. f. 10 



Productus hemisphcericus. M.C. t. 238. -| 



— Martini. M.C. t. 318. f.2,3&4. 



como'ides. M.C. t. 239. ... 



Chief Localities. 



Spirifer papilionaceus. Phill. pi. 11. f. 6. "1 



radialis. Phill. pi. 11. f. 5 I- Pembrokeshire. 



resupinatus. Phill. pi. 11. f. 1. ... J 



semicircular is. Phill. pi. 9. f. 15 \ Littleton on Se- 



J vern. 



hisulcatus. M.C. t. 494. f. 1 & 2. ■ 



&16 



cuspidatus. M.C. t. 120 



— — distans. M.C. t. 494. f. 3 



octoplicatus.M.C. t. 562. f. 2, 3 &4. J 



Terebratula fungites. MSS. Phill 



ambigua. Phill. pi. 11. f. 21. 



radialis. Phill. pi. 12. f. 40 



Clee Hills, Shrop- 

 shire. 



& 41. 



Spirifer attenuatus. Phill. pi. 9. f. 13 J» Pembrokeshire. 



■ connivens. Phill. pi. 11. f. 2 



imiricatus. Phill. pi. 10. f. 20.... 



• —filiarius. Phill. pi. 11. f. 3 _ 



Crinoidea occur in vast profusion, including genera and species described by Miller from the limestone of Bristol. Corals 

 also are in parts very abundant (see chap. 7). Orthocerata are very rare, and I never found one with well-marked 

 characters. Trilobites are also scarce, but a few examples of them have been detected by the Earl of Cawdor in the coast 

 cliffs near Stackpole, Pembrokeshire, among which are caudal portions of Asaphus seminiferus and A. granuliferus of 

 Phillips. The Ichthyodorulites of this formation are of peculiar forms and have been described by M. Agassiz ; among them 

 is the Ctenacanthus tenuistriatus of the Clee Hill limestone, (p. 119.). Other species occur near Bristol. 



Considering this formation to be well known, I did not collect many organic remains, so that after all the list is very in- 

 complete. We may, however, consider it as a sample of specimens taken from various localities; and viewing them in this 

 light it is worthy of remark, that every species above enumerated has been previously described by Professor Phillips as 

 occurring in the limestone of this age in other and distant tracts. On the southern edge of the South Welsh coal-field, par- 

 ticularly between the Mumbles and Pennard, west of Swansea, the carboniferous limestone has been diligently explored by 

 my friend Mr. Dillwyn, M.P., whose skill in conchology has enabled him to detect many species in addition to those com- 

 monly observed in the formation. In his list, which has not yet been published, he enumerates — 



Ammonitesl and Goniatites, 2; Bellerophon, several species; Cirrus'! several; Dentalium, 1; Euomphalus several ^ 

 Eulimal 1; Littorina,3; Lutraria,!; Melania,S; Natica,l; Orthocerata, several; Turbo, I; Trochus,3; Turritella, 4 ; 

 Rotella, 1, &c. Among these also Professor Phillips has also recognised many published in his work, while Mr. J. de C. 

 Sowerby coincides with me in opinion that not one of these species has yet been found in the Old Red or Silurian Systems. 



1 For the sake of uniformity and to prevent the possibility of error, the names Spirifer and Productus are 

 used throughout. Mr. Phillips writes Spirifera and Producta. 



