8 Prof. P. F. Kendall — Eqiiisetites on Yorksltire Coast. 



Shales [Dactylioceras commune zone) of the Upper Lias to the over- 

 lying Dogger Sandstone and Lower Estuarine Sluiles and Sandstones. 

 The succession is as follows : — 



'Soil and rubble ....... 



Sandstone ........ 



Shale ......... 



feandy shale with boxstone concretions . 

 Splintered sandstone ...... 



Eaggy sandstone ....... 



Grey and black carbonaceous shale 



Eaggy sandstone with many rootlets in the upper 



part and erect stems of Equisetuiii in the lower 



3 feet ........ 



Sandy fissile shale with rhizomes of Eqiiisctum and 



poorly preserved fronds of Williamsonia 

 Grey shale without marked bedding, mucl: 



resembling a Coal-measure ' seat-earth ' . 



Shale 



Nodular and ferruginous shale 



Coarse, massive, ferruginous sandstone . 



Massive sandstone pierced with many vertical roots 



Compact sandstone ... 



Fissile sandy shale ..... 



13 



4 6 



1 



3 

 2 4 



V Black shale 



Dogger, very ferruginous columnar sandstone with 

 pebbly base ....... 



Upper Lias ........ 



6 



3 



The Dogger Sandstone is unfossiliferous, in this section, but its 

 lithological characters are unmistakable. The columnar jointing is in 

 many places extremely close and well-marked, the polygonal columns 

 in some examples being not more than two or three inches in diameter. 

 The pebbles at the base appear to he rounded concretions, probably 

 derived from the Upper Lias. Some show small spheroids that may 

 be of an oolitic character and remind me of the more sparsely oolitic 

 varieties of the Cleveland Ironstone, to which I may have mistakenly 

 ascribed pebbles in the Dogger at Wain-Stones (see Mr. Rastall's 

 paper on the Dogger, Q.J.G.S., vol. Ixi, 1905). 



It is interesting to note that this section is the exposure of Dogger 

 nearest to the Peak Fault that brings in a greatly expanded develop- 

 ment of this division of the Lower Oolites, as well as Blea Wyke 

 Beds and the Striatidus shales of the Upper Lias, no representative of 

 which are found on the upthrow side of the fault. 



The Lower Estuarine Beds present a strong resemblance to 

 a section of Coal-measures, and were no doubt deposited under 

 analogous condition ; the chief difference between them is in the 

 less degree of induration of the newer series. The Equisetiim bed 

 is easily recognized from the level of the railway (Scarborough and 

 Whitby line) that passes through the quarry as the second bed of 

 sandstone above the Dogger. Sandstone casts of JEquisetum stems in 

 the erect position pierce the sandstone in large numbers ; some fallen 

 blocks show transverse sections on the bedding-planes every 8 or 

 10 inches. Stems may be traced to a length of 18 inches. The top 



