1857.] PHILLIPS OOLITE AND LIAS, YORKSHIRE. 93 



point north of Haiburn Wyke, nor in Staintondale Cliff, the grit, 

 shale, and coal of Hambleton, 164 feet thick, will be below the 

 whole of the Bath Oolite, and correspond to the Haiburn coal 

 series. 



What in this case is the rough nodular "glance" oolite (2 feet) 

 with Avicula, resting onrubbly sandstone, with Nucleolites, 18 feet ? 

 Is it of the date of Stonesfield slate ? 



The Cricopora-beds of Gristhorp, below the coal series there, 

 lose their distinctness in going northward and westward, so that 

 they become untraceable ; on the other hand, we find the Belem- 

 nitic beds to fail entirely toward the southward and westward. 

 On a line which runs north and south between the coast and the 

 Hambleton Cliff, and which thus partakes of both these negative 

 geographical influences, neither of them is yet certainly known, 

 though we may expect to find the upper set of beds ; nor have we 

 on that line any trace of the Gristhorp plants. The rough nodular 

 " glance " bed is recognized, as I think, on the line of the Whitby 

 railway, about 100 feet below the shelly beds of the Bath Oolite. 



Still less obvious are the lines of contemporaneity lower down in 

 the thick series above the Inferior Oolite, when comnared on the 

 two parallels from north to south. On the coast are sandstones and 

 shales, with zones of plants, but no calcareous bands, and no remark- 

 able ironstone ; under Hambleton, with a smaller thickness of are- 

 naceous and argillaceous sediments, we have one or even two groups 

 of white cement-nodules (compact argillaceous limestone), one con- 

 taining Glyphice, a group of valuable ironstone-nodules, and even 

 a 3-foot band of ironstone. These deposits are only seen in the 

 western range of the Oolites. 



The lowest part of the Bath Oolite formation on the Yorkshire 

 coast consists of the ferruginous "dogger," with two bands of shells 

 at the Peak ; under it is a group of grey, micaceous, soft, sandy rocks, 

 apparently the " Gold Cap Sandstone " of Lyme Regis, " Sand 

 of the Inferior Oolite " of Bath, and of the Cliff-hill of Lincolnshire. 

 Under Hambleton these are represented by ferruginous oolites, con- 

 taining Ammonites, Hyboclypeus, Trigonia, &c. ; but this character 

 of the rock, by which it approximates to the lower part of the sec- 

 tions of Inferior Oolite in Gloucestershire, ceases as we proceed 

 northward, and is modified as we proceed southward. 



On a line drawn from north to south between the coast and the 

 Hambleton, we find the oolitic band at the top of the Lias very 

 rich in iron. In a part of Rosedale, especially, it is an oolitic iron- 

 rock, the central part of a great mass on one side of the valley being 

 very attractable by the magnet, and yields, at a maximum, about 

 50 per cent, of iron. 



Other Inland Sections. — We may now proceed to trace briefly the 

 variations which take place in proceeding southward from the country 

 of Thirsk toward the Humber and Lincolnshire, where something 

 nearer the normal type of the Bath Oolites is recognized. 



Kilburn. — In the vicinity of Hood Grange, Hoodhill, and Kilburn, 



