ofNettleton Hill, Lancashire. 



565 



appears to belong to the genus Large masses of wood are occasion- 

 Malleus of Lamarck. ally found by the workmen in the 

 Clypeus . lower part of this bed. 



The Green Sand and Sandstone are composed of grains of 

 quartz of various sizes, mixed with abundance of green specks. 

 Sometimes this sand is cemented together, and forms a very 

 hard sandstone. The general colour of the bed is greenish ; 

 but sometimes the cementing matter is ferruginous, which, of 

 course, alters the appearance. This is peculiarly the case with 

 a bed which was discovered by Mr. Dikes, in a late excursion 

 to this neighbourhood. At first sight, the stone in this lo- 

 cality appears like an oolite; but, on closer examination, it is 

 merely a mass of small, globular, shining grains, of a dark 

 brown colour, cemented together by ferruginous matter: it 

 occurs in the higher part of the bed, nearly at its junction 

 with the grey stone; and, possibly, ought to have been classed 

 with it. 



The whole thickness may be taken at from 30 ft. to 40 ft. 



Organic remains are rare in the greenish beds; or, at least, 

 they are confined to few species : we only met with Pecten 

 orbicularis and Belemnites, similar to B. mucronatus. 



In the ferruginous stratum mentioned above, Mr. Dikes ob- 

 tained the following fossils : — 



Trochus monilifer ? 



Trdchus . 



Gryphae v a nana? 



Astarte lineata. 



Astarte formosa Dr. Fitton, Geol. Plagiostoma ovalis ? 



Trans., xvi. 16.. Terebratula striatula. 



Lucina crassa. Ammonites circulates Dr. Fitton. 



Mytilus ede'ntulus. 

 Exogyra conica. 

 Exogyra plicata ? 

 Trigonia clavellata. 



Cucullae x a 



Venus submersa 

 Trans., xvii. 4. 



Dr. Fitton, Geol 



Geol. Trans*, xi. 20. 



The Kimmeridge Clay extends over a large tract of land in 

 the north of Lincolnshire : it is the substratum of the wide 

 plain at the foot of Nettleton Hill, and even forms a large 

 portion of the hill itself. This will be rendered more ap- 



96 



T$?. 2 



„89I03i 



parent by the annexed section {Jig. 69.), taken across the hill 

 and the valley. The black straight line in the map represents 



T t 3 



