H. Ciiljnn — Marine Beds in Coal-measures, Yorkshire. 149 



Ackworth rock, 17 feet above the Shafton Coal, and 1, 130 feet above the 

 Barnsley Coal. This bed is probably the one mentioned by Green. 

 At Brodsworth its examination yielded numerous fragments of 

 Goniatites, including a curiously preserved Ghjphioceras sp., showing 

 the suture-lines. The other mollusca were Lingula mytiloides (very 

 abundant), Pterinopecten papyraceiis (abundant), Posidoniella Imvis^ and 

 Nuculana acuta. Of fish-remains only Megaliclitliys was determinable. 

 There were occasional traces of plants, including Calamites sp. and 

 Neuropteris heterophylla, Brongn. 



The base of the second bed, which was apparently about 15 feet 

 thi-ck, was 219 feet above the Melton Field Coal and 705 feet above 

 the Barnsley Coal. The top of it consisted of blue fucoid-marked 

 shales with a soapy feel. Then came similar shales crowded with 

 Litigula, followed by greyish-blue harder shales with abundant Pterino- 

 pecten, Goniatites, etc. The base was a very hard greyish-blue lime- 

 stone 'cank,' which broke the drills. The lithological characters of 

 the bed were remarkably different, both to the eye and the touch, 

 from the ordinary measures, and should enable the mining expert to 

 readily distinguish and use it as a datum-line in any future boring or 

 sinking. The following is the list of fossils found in it : — 

 Brachiopoda. Cephalopoda. 



Chonetes laguessiana, mut. 0. Pleuronmitilus costatus. Hind. 



OrbiciUoidea nitida. Glyphioceras micronotum, Phill. • 



Lingula mytiloides (very abundant). Glyphioceras reticulatum (?), Phill. 



Lamellibeanghiata. Bimorphoceras Gilhertsoni, Phill. 



Syncyclonenia carboniferum, Hind OrtJioceras asciculare. Brown, 



(abundant). Orthoceras Sttinhaueri, Sow. 



Pterinopecten papyraceus, Sow. (very Pisces. 



abundant). Acanthodes. 



FosidonieUa sulcata, Hind. Elonichthys Egertoni. 



Myalina compressa, Hind. Megaliclitliys Hibberti. 



Nucula (Bqualis, Sow. Ithizodopsis sauroides. 



Nuculana acuta, Sow. Plants 



Ctenodonta Icevirostris, Portl. (very Lepidodendron ^^. .' 



abundant]. Neuropteris heterophylla, Brongn. 



G-asteropoda. Neuropteris cf. rarinervis, Bunb. 



Euphemus sp. (probably new). 



The base of the third bed was 100 feet below the Melton Field 

 Coal and 382 feet above the Barnsley Coal. It yielded Pterinopecten 

 fwpyraceus and numerous specimens of Lingula mytiloides, which in 

 some parts of the bed were very small, and in other parts exceptionally 

 large. Fish fragments were plentiful, including — 



Acanthodes Wardi. Rhadinichthys monensis. 



Pleuroplax Rankinei. Rhizodopsis sauroides. 



Ccelacantlms elegans. 



The fourth bed, which had a hard ' cank' at its base, was 111 feet 

 above the Barnsley Coal. It yielded only Lingula mytiloides, and 

 a fish-scale which was probably Rhizodopsis sauroides. In this case, 

 ISpirorhis, Carhonicola var. aguilina, and Naiadites modiolaris occurred 

 in close proximity to the Lingula material. 



Thanks are due to Dr. Walcot Gibson for encouragement and 

 assistance in the work ; and to Dr. Wheelton Hind, Dr. A. Smith 

 "Woodward, and Mr. E. Kidston for examining and naming the 

 mollusca, the fish, and the plant-remains. 



