430 



and the following is a list of the species given hy Mr. Williamson, as 

 occurring cliietly in the middle and lower portions of the bed : 



Trochus granulafus, T. bisertus, T. pyramidaUs, Solarium calix, Ner'ila 

 costata. Turbo Iccvigatus, T funiculatus, Rostellaria composita, Natica ad- 

 ducta, N. tumididn, Terebra vetusta, Acteon hicmeralh. Auricula Sedgvici, 

 Ostrea Marsliii, O. soiitaria, Pecten virguliferus, P. abjectus, Trigonia angu- 

 lala, T. costata, T. striata, T. gibbosa, Avicula Braamburiensis, Astarte ele- 

 gans, A. viinima, Modiola pidchra, M. cuneata, Mytilus sublcevis, Cardita 

 similis, Nucula axiniformis, hocardia concentrica, Cardium iiicertum, Phola- 

 domya ovalis, Uiiio abdiictus, Gastrochcsna tortuosa. 



The upper part of the stratum is characterized by TurriteUa muri- 

 cata, T. quadrivittata, T. humifusa, T. cingenda (Phillips) in great 

 abundance, Melania Heddingtonensis , Terebrutula obsoletu, and Ca- 

 ryophyUiu convexa. 



In No. 6, the highest stratum of the inferior oolite, no fossils have 

 been noticed by Mr. Williamson. 



2. Immediately above the inferior oolite lies the lower sandstone and 

 shale, an important formation on account of the absence of marine 

 remains and the presence of terrestrial plants. With the exception 

 of a similar series of beds above the great oolite, this formation is the 

 most irregular in its subdivisions of any on the Yorkshire coast. The 

 only point at which the upper and middb divisions of the series are fully 

 developed are the cliffs between Cloughton Wyke and Blue Wick; 

 the remainder of the coast exhibiting only the lower divisions. The 

 following is the succession of the beds in ascending : Feet. 



1. Black carbonaceous shale, no vegetable remains . . 10 



2. Hard, pale, gritty sandstone, containing at its junc- 



tion with No. 1 . great abundance of a new species 

 of Calamites, also fronds of Zamia gigas, and a 

 remarkable fossil apparently connected with the 

 fructification of a Cycas 20 



3. Shale 10 



4. Gritty sandstone 20 



5. Softish sandstone containing fine specimens o( Equi- 



setum columnare, all in a vertical position with their 

 roots downwards 8 



6. Soft black shale , 3 



7. Sandstones and shales 170 



8. Dark shaly sandstone 8 



9. Hard grey sandstone 6 



10. Black shale 2 



1 1. Laminated sandstone containing great abundance of 



various species of beautiful ferns, Cycadean plants, 

 and Equiseti, also towards the lower part three 



seams of soft jet 6 



The following are the species enumerated by Mr. Williamson : — Equise- 

 tum laterale, Lycopodites Williamsonis, L.falcatus, Tliuites expansus, Sphe- 

 nopteris longifolia, S. hymenophylloides, Pecopteris ligata, P. curtata, P. Whit- 

 biensis, P. Williamsonis, Pteropkylluvi pectinoides, P. minus, Otopteris acii' 

 minata, Cyclopteris digitata, Tceniopteris vittata, Solenites Murrayana. 



