144 THE LIAS AMMONITES. 



It is now twenty years ago since I discovered the Jurense-zowe at Blue Wick, near 

 Robin Hood's Bay, on the Yorkshire coast,^ beneath a rock which I considered the 

 equivalent of the basement bed of the Dogger or Inferior Oolite. It was a yellowish sand- 

 stone, containing several seams of small round pebbles, which lie near the bottom. The 

 pebbly conglomerate is about 4 inches in thickness, and occurs at intervals. The 

 sandstone contains fragments of Beleranites, Cerithia, and Monotis nitescens. Simp. The 

 bed is about 5 feet thick, and lies on No. 1, a band of dark friable shale, resting 

 on a hard ironstone band full of fossils. This bed is very micaceous in parts, and many 

 of the shells are stained with ferric oxide. I found TerebraiuJa trilineata. Young and 

 Bird, in clusters in the sandstone, with Belemnites compressus, Voltz, Bel. irregularis, 

 Schloth., Trigonia Bamsayi, Wright, and Rhi/nchonella cgnocephala, Rich. These species 

 occur also in a ferruginous seam of sandstone at Glaizedale. This bed is 18 inches 

 thick, and rests on No. 2, the Yellow Sandstone, which is well exposed at Blue Wick. 

 It consists of irregular layers of soft yellow sandstone, unequally indurated ; some 

 portions weather out and leave hollows in the cliff, whilst others are fine-grained, 

 yellowish, highly micaceous, thick-bedded, and variously jointed. The upper part of this 

 rock is ochraceous, and contains fossiliferous seams. Here I found in one large block 

 Harpoceras Comense, von Buch, Harp, insigne, Schiibl., Goniomya angulifera^ Sow., 

 Monotis inaquivalvis. Sow., Trigonia Bamsayi, Cerithium sp., Turritella sp., Astarte 

 sp., Gresslya pinguis, Glyphaa Birdii, Bean. This bed is about 20 feet in thickness. 



No 3, the Serpula-hed, a fine-grained greyish-yellow sandstone, which forms a 

 reef, dips gently to the south-east, and presents a low escarpment to the north ; it is 

 regularly jointed, and the exposed upper surface contains masses of Serpula diplexa. 

 Bean, Vermetus compressus, Will., Pecten inter costatus, Wright, Harpoceras Aalense, Ziet. 

 (var. Moorei, Lye), and Heterocidaris Wickensis, Wright. This bed is 10 feet in 

 thickness ; the upper 4 feet are most fossiliferous ; in the lower six feet the same species 

 of shells are sparsely distributed. 



No. 4, the Lingula-hedi or grey sandstone is a soft argillo-micaceous sandstone of 

 a bluish-grey colour, and partly fissile. This rock is divided by long joints, and forms 

 " scars " at Blue Wick. Its upper, fissile portion is fossiliferous, and contains Lingula 

 Beanii, Phil., Discina reflexa^ Sow., and Monotis nitescens, Simp. About the middle of 

 the bed a layer of small nodules occurs, fragments of Crustacea, Glyplma Birdii, Bean, 

 and GlypJiaa, n. sp., allied to rostrata, are found in these nodules. The lower portion is 

 rough and sandy, and passes into hard, argillaceous, nodular layers : I collected 

 the following species from the sand : 



Harpoceras Aalense, Ziet. 



— variabile, (TOrb. 

 Belemnites compressus, Voltz. 



— irregularis, Schloth. 



Alaria Leckenbi, n. sp., Wright. 

 Cerithium quiuque-puiictatum, Deslony. 



— vetustum, Phil. 

 Mjtilus Wickensis, Wright. 



^ 'Quart. Journ. Geol. Soc.,' vol. xvi, pp. 3 and 4. 



