26 PBOCEEDItfGS OF THE GEOLOGICAL SOCIETY. [Apr. 6, 



where the Kelloway Rock first appears on the shore. At Puddinghole 

 it is seen in the cliff, and may be traced along the coast-section as 

 far as Gristhorpe Sands ; from thence to Redcliff it is covered by 

 Drift ; at Redcliff it is thrown down by a fault, and is seen there 

 at low water on the shore. At the northern extremity of Cayton 

 Bay it rises again ; but the fault at Ewe Nab has brought it down 

 to the shore, where a small portion only is visible at half-ebb. At 

 the north side of the Castle Hill it is raised in the cliff by the dis- 

 location which has disturbed the beds in that locality ; and it finally 

 sinks and disappears near Peasholm Beck. The Cornbrash is se- 

 parated from the Kelloway Rock by a bed of dark-bluish clay (a), 

 more or less laminated, which varies from four inches to six feet in 

 thickness ; this is the so-called " Clays of the Cornbrash." 



The clay (a) contains several species of shells which are rarely met 

 with in the bed below, such as Sanguinolaria parvula, Bean, Gar- 

 dium latum, Bean, Opis triangularis, Bean, Belemnites tornatilis, 

 Phil. The claws and carapace of two Crustacea (Glyphcea rostrata 

 and GlypJicea Birclii) occur in round argillaceous nodules in the clay 

 at Cayton Bay, where my friend Dr. Murray collected likewise a 

 beautiful specimen of Hemipedina Woodwardi, "Wr., which he kindly 

 gave me to figure. 



Beneath the clay is the Cornbrash, which consists of a hard iron-shot 

 oolite (b), of a bluish-grey colour, and often stained with the peroxide 

 of iron. It occurs in masses of an irregular shape, which contain a 

 great many fossils, laid in all directions and firmly cemented together. 

 The shells are so numerous in some of the fossiliferous blocks, that 

 it is impossible to extract one specimen entire without sacrificing 

 many others. It is from this bed, which is only about two feet in 

 thickness, that most of the specimens of the subjoined list were 

 obtained. Beneath the hard bed is (c) a softer rock, which is only 

 partially iron-shot, and not so fossiliferous ; it is from 18 inches 

 to 2 feet in thickness, and passes into (d) a more fissile oolite, easily 

 decomposed when exposed to the atmosphere. The last rests on 

 the upper sandstone and shales of the Inferior Oolite. 



Although the Cornbrash of Scarborough is only a thin and unim- 

 portant rock, of about five feet in thickness, it has yielded to the 

 working geologists of that locality about 130 species of beautiful 

 fossils, the majority of which were collected at the north side of the 

 Castle BUI. The rock has here been worked out, and will shortly 

 be covered up by the innovations now in progress. 



ample details will be found in Prof. John Phillips's comparative sections in 

 the Oolitic and Ironstone series of Yorkshire, Quart. Journ. Geol. Soc. vol. xiv. 

 pp. 88, 89. 



My object in the following descriptions is to show the relation of the Grey 

 Limestone to the Cornbrash and Upper Sandstones above, and to the Millepore- 

 bed below, and, from the fauna of the Grey Limestone, to demonstrate that 

 it is the representative of the Middle and Upper divisions of the Inferior Oolite 

 of the south of England, and not, as maintained by my friend Prof. Phillips, 

 the correlative of the Great or Bath Oolite. 



