230 



HARKER : OOLITES OF CAVE DISTRICT. 



but the more thick-bedded portions are blue-hearted. The greater 

 part of the series is poor in fossils, but yields a few Trigonia 

 conjungens, Lhna, &c., with the ' millepore' or Cricopora sira??iinea of 

 Phillips : these serve to connect the beds with the Millepore Oohte 

 of the Coast and the Howardian Hills, which is found to thicken in 

 this direction. In a quarry a little north of Brough, however, there 

 occurs, apparently low down in the series, a very fossiliferous horizon. 

 Here are found the little spiny Rhy?ico?iella Crossii (Walker), Pinna 

 cuTieata^ Myacites decurtatus, Pecten deinissiis and lens^ curiously crushed 

 specimens of Cardinia and Terehj'atula^ and many other fossils. 

 A small costate Trigonia occurs in the lowest bed here exposed. 

 I was fortunate enough also to discover a fine Hybodus tooth. We 

 have here a link between the Yorkshire Lower Oolites and the 

 ' Lincolnshire Limestone.' Rhynconella Crossii occurs at Appleby in 

 the latter county. 



The most important member of the Middle Oohtes is the Kello- 

 way Rock, which reaches a thickness of more than forty feet, and in 

 its hard upper beds forms a feature at the surface. Lithologically as 

 well as palaeontologically it bears a fairly close resemblance to the 

 corresponding strata in Newtondale and Cayton Bay. The best 

 section is in the ' Town Quarry ' at North Newbald. At the base are 

 about fifteen feet of loose reddish sand, with fossils abundant 

 but badly preserved : Avicula incequivalvis and Braamburiensis^ 

 Goniomya literata^ Pholado^nya obsoieta, and Pecte?i fibrosus are 

 characteristic. Above this comes soft, homogeneous, micaceous, 

 white sandstone to the thickness of twenty feet, without fossils, 

 except for fragments of wood and a band in the middle, crowded with 

 Belemnites. At the top come red-brown sands, more or less consoli- 

 dated by ferruginous and calcareous cement, about five or six feet 

 being seen. These contain a great variety of fossils, among which 

 may be mentioned GryphcEa bilobaia (very abundant), A??ifno?iites 

 K(jenigi, sublcBvis, diinca?ii^ goweriamis and cordatiis^ Belemnites 

 owenii, Pinna mitis^ Trigonia rupellensis (?), Modiola cuneata, 

 (a small species), and Waldheimia ornithocephala. Rhynco7iella 

 socialis, both flat and convex forms, is very common both here and in 

 the lower sands. The preponderance of lamellibranchs in the lower 

 part and cephalopods in the upper is in accordance with what is seen 

 in the Cayton Bay and Scarborough sections. 



A peculiarity of the Kelloway Rock is the occurrence of very 

 large hard concretions, which sometimes assume r*egular forms, 

 spheroidal and cylindrical, and are locally known as ' eddystones 

 some are more than three feet in diameter. The rock is seen in 



Naturalist, 



