10 A NEW FLOEA OF 



interstrialis ; Amusium Sowerbyii, deornatum ; Pecten subeloiigatus ; Pinna 

 flexicostata, flabelliformis, membi'anacea ; Pteronites angustatus, persul- 

 catus ; Posidonia Becheri ; Streblopteria ptilchella ; Myalina Verneulii ; 

 Lithodomns dactyloides ; Area cancellata ; Bysso-arca costellata ; Nucida 

 gibbosa ; Leda attenuata ; Solemya primeeva ; Leptodomus costellatus ; 

 Schizodus axiniformis, carbonarius, deltoides ; Conocardimn elongatum ; 

 Edmondia sulcata, unioniformis, arcuata ; Cardiomorpha oblonga, striata ; 

 Sanguinolites sulcatus, variabilis, iridoines ; Conularia quadrisulcata ; Den- 

 talium dentaloideum, priscum ; Capulus trilobus ; Pleurotomaria atomaria, 

 sidcatula, decipiens, angulata, lielicinoides ; Euomphalus carbonarius, acu- 

 tus, catiUus, Diouysii ; Macrocheiliis acutus, Michotianus, limnseformis ; 

 Naticopsis plicistria ; Loxonema rugif era, suleulosa, elongata ; Platyschisma 

 helieoides ; Bellerophon Urii, deeussatus, striatus, liiulcus, apertus ; Nautilus 

 ingens, globatus, perplanatus, sidcatus, subsuleatus, costata-coranatus ; 

 Goniatites splisericus ; Actinoceras giganteum ; Orthoceras sulcatum, Ges- 

 neri, inequiseptum, attenuatum, fusiforme, cornu-vaccinum, &e. 



The Lower or Carbonaceous group, from the base of the Dun 

 Limestone to the top of the Tuedian formation, has a thickness of 

 about 900 feet, and is especially marked by the mimber, thick- 

 ness, and quality of its coal seams. In this we have in descend- 

 ing order the following eight seams of workable coal, viz., the 

 Fawcet or Falcet Coal, about 40 feet below the Dun Limestone, 

 is from 18 inches to 3 feet 4 inches thick ; the Scremerston Main 

 Coal is from 2 feet to 4 feet ; the Stoney Coal from 1 foot to 3 

 feet 6 inches, but of poor quality ; the ^ilain or Cancer Coal from 

 2 feet to 7 feet ; the Three-quarter Coal, of inferior quality, from 

 2 feet to 4 feet ; the Cooper or Cowper Eye Coal, one of the best 

 for domestic use, from 17 inches to 3 feet; and the Wester Coal 

 from 3 feet to 4 feet 6 inches in thickness. There are a few 

 limestones in this division, but they are thin and generally im- 

 pure, and their aggregate thickness is only about 20 feet. Some 

 of the marine organisms of the calcareous group appear here, but 

 in fewer numbers. In some shale beds remains of ganoid iish are 

 abundant, accompanied by Schizodus carbonarius, Anthrocomya, 

 Aviculo-pecten, Lingula squamiformis, organisms generally asso- 

 ciated with coal seams. This group is intermediate in its cha- 

 racters between the calcareous group of the Mountain Limestone 

 and the Coal Measures ; and taking the mass, it is more allied to 



