﻿Yol. 6l.~] BLEA WTKE BEDS IN NOKTH-EAST TOBKSHIBE. 447 



The so-called ' Nerincea-Bed ' is a thin ferruginous band, com- 

 posed very largely of shells, often broken, and preserved in reddish 

 ferric oxide. The band is accessible only for a short distance, and 

 is not at all conspicuous to the eye. This is the source of most of 

 the fossils in museums which are labelled 'Dogger, Blea Wyke,' 

 'Inferior Oolite, Peak,' and so on. The fauna is a large one. 

 The following list, taken from Messrs. Fox Strangways & Barrow's 

 Memoir 1 before quoted, is given, for comparison with the fauna of 

 the inland sections : — 



Bhynchonella obsoleta. 

 Terebratula perovalis. 

 Hinnites velatus. 

 Gervillia tortuosa. 

 Tteropema striata. 

 Modiola cuneata. 

 CucullcBa cancellata. 

 Macrodon hirsonensis. 

 Trigonia denticulata. 

 Trigonia V-costata. 

 Trigonia spinulosa. 

 Cypricardia acutangula. 

 Tancredia axiniformis. 

 Cardium striatulum. 



Opis Thillipsii. 

 Asta,rte elegans. 

 Ceromya bajociana. 

 Gresslya adducta. 

 Natica adducta. 

 Natica punctura. 

 Chemnitzia lineata. 

 Rerincea cingenda. 

 Cerithium, 2 spp. 

 Alaria Phillipsii. 

 Onustus pyramidatus. 

 Nerita Icevigata. 

 Trochotoma. 

 ActcBonina. 



This fauna possesses an undoubtedly-Oolitic facies. Unfortunately, 

 ammonites are entirely absent, consequently the exact zonal posi- 

 tion of the bed cannot be determined. However, I shall here 

 regard it as the basement-bed of the Oolites of this region, 

 without troubling myself as to its correlation with one or other 

 of the minute subdivisions proposed by Mr. S. S. Buckman and 

 others for the Inferior Oolite of the South-West of England. 



Above the Nerincea-Bed come 10 feet or so of yellow ferruginous 

 sandstone, with scattered pebbles. This is undoubtedly the equiva- 

 lent of the ' Dogger ' or ' Top Seam ' of the other sections ; it 

 weathers out, in a peculiar and very characteristic way, into knobs 

 and concretions of iron-oxide, very like the Lower Greensand of 

 Bedfordshire and Cambridgeshire, as also do the Yellow Beds 

 below. This sandstone seems to be quite unfossiliferous, but very 

 little of it can be reached : the only accessible part extends for a 

 few yards at the southern end of the section, where the lowest 

 division of the cliff dwindles away to nothing and disappears ; the 

 southerly dip is here strong, and soon carries the whole series below 

 sea-level. Farther north this division is quite inaccessible. 



Above this sandstone comes a thick series of dark shales with 

 beds of sandstone, the typical estuarine development of this part of 

 the Jurassics of Yorkshire. This series is very well displayed in 

 the upper part of the cliffs above Blea "Wyke Point. The Estuarine 

 Beds, as a whole, are here perhaps rather more shaly than usual, 



1 'The Geology of the Country between Whitby & Scarborough' (Expl 

 Quarter Sheet 95 N.W.) Mem. Geol. Surv. 1882, p. 27. ' 



