156 OUR COMMON BRITISH FOSSILS. 



Hill, Banbury, unless the pits are now filled in. The 

 Oolitic rocks which crop up from Grimston to Bur* 

 dale, near Scarborough, contain beds full of Echino- 

 bryssus sciitatus^ besides spines of Hemicidaris, 

 Various species of Cidardis are also found in the 

 Kentish and Norfolk Chalk, either whole or as detached 

 plates ; and sometimes we find the impression of one 

 of the latter on a flint, when it presents a very pretty 

 appearance. Solitary club-shaped spines and impres- 

 sions of the same in flint are very common in the 

 Chalk formation generally. In the Greensand at 

 Warminster, which crops out from under the escarp- 

 ment of the Downs, the geological student may find 

 a good assortment of fossil Echinoderms, such as 

 Nucleolites, Caratomus, Cidaris pusio, Goniophorns 

 favosus and G. hmulatus, Holaster grmiidosiis^ 

 Micr aster laciinosus^ Salenia clathrata, S. geometricay 

 S. ornata, S. 7/mdrella, etc. Faringdon, in Berkshire, 

 is another rich Greensand formation abounding in 

 fossil Cidarids, where Salenia petalifera is especially 

 plentiful. Charlton, near Woolwich, is a good place 

 for Chalk Cidarids ; and the well-worked pit near the 

 railway station will afford the student good specimens 

 of many other Cretaceous fossils besides ; whilst the 

 Tertiary sands overlying the Chalk sections are in 

 places rich in peculiar fossils. Very fine Cidarids 

 may be obtained from the Chalk quarries at Grays, 

 Essex. The Chalk near Caterham yields Holaster 

 and others. The Chalk quarries near Hitchin station 

 are very rich in Holaster giobosa, etc. 



