134 Sheppard : Geology of Brough, East Yorkshire. 



clear manner the gradual change from the solid rock into the 

 gravel and finally into the soil. 



At the bottom of Mill Hill, which is nearer Brough, there is 

 a very small but interesting exposure which is exceedingly 

 fossiliferous, and Mr. Harker thinks it belongs to the lowest 

 beds of the Millepore. This small section, which was but a few 

 feet square when I first saw it, is exceedingly rich in organic 

 remains. The minute spiny Rhynchonella crossi, and Tere- 

 bratida sp. ?, usually crushed in a curious manner (for secondary 

 fossils) are the most abundant. Pinna cuneata, Pecten lens, 

 and P. demissus, Myacites, Cardium, Lima, etc., also occur. 

 Mr. Harker records a fine Hybodns tooth, a find it was never my 

 lot to make, though a year or two ago, on an excursion of the 

 Yorkshire Naturalists' Union in the neighbourhood, one of 

 the members picked up a small black palate tooth on a piece 

 of Millepore from a heap of repairing metal at the roadside. 



The fossiliferous section just referred to will soon be out of 

 the reach of geologists, as a villa is being erected on its site ; 

 another example of the drawbacks of ' civilisation ' from a 

 geologist's point of view. 



Our next rock is rather a disappointing one, and is known 

 by the name of the Great Oolite Clay or Sandy Oolite. It 

 consists of a series of sands and clays. They were ' first con- 

 sidered to be the equivalent of the Upper Estuarine Series of the 

 Yorkshire coast, but as they join on with the Great Oolite Clays 

 of Lincolnshire they have now been mapped with that forma- 

 tion.* No fossils are recorded from this, and there are no 

 exposures, such particulars as are recorded being the result of 

 borings for wells, etc. A few years ago I put on record! details 

 of the beds exposed in a well then being dug about half-way up 

 Mill Hill, near Brough. The strata cut through, commencing 

 at the top, were stiff blue clay stained with yellow at different 

 points, and containing neither fossils nor stones ; then yellow 

 clay, and, finally, fine yellow sand. 



When the Survey Memoir on this district was written in 

 1886 the only exposure in the Great Oolite Clay then visible was 

 on the railway embankment near South Cave station ; but of 

 this section the surveyor says : — ' The beds are so similar to the 

 sands of the Kellaways Rocks above that it is difficult to fix an 

 exact horizon between them. 'J It has since been well grassed 



* Geol. Survey Mem., op. cit., p. 22. 

 f Proc. Yorks. Geol. and Polyt. Soc., 1896, p. 222. 

 t p. 22. 



Naturalist, 



