Fossil Remains on the Yorkshire Coast. 149 



sence oi Belemnites ahhreviatus and Gryphcea bullata. A little above these, the great 

 mass of fossils is met with. The following are the species which I have found in 

 that position : 



Serpula intestinalis. 

 Astarte lurida. 



carinata. 



Avicula expansa. 

 Nucula nuda. 



elliptica. 



Pinna mitis. 



Pecten, a smooth species. 

 Belemnites gracilis. 

 Ammonites Vernoni. 



cristatus. 



athleta. 



oculatus. 



Teeth of a Squalus. 



I have since found a JVautilus, apparently the N. hexaffonus ot the Kelloways rock ; but being crushed, 

 I dare not be positive. 



A little higher are occasionally found remains of at least two species of Astacus ? 

 generally very imperfect. 



In the middle portion of the stratum I have met with no fossils, but nearer its 

 junction with the calcareous grit are occasionally obtained small specimens of 

 Pinna lanceolata. None of the above species are abundant, but the most frequently 

 found is the Belemnites gracilis ; indeed the Oxford clay of Yorkshire will not bear 

 any comparison with that of Huntingdonshire and other midland counties, either 

 in the number or beauty of its organic remains. 



The following fossils 1 have not seen from any other stratum : 



Ammonites Vernoni. 



cristatus. 



oculatus. 



Nucula nuda. 



elliptica. 



Pinna mitis. 

 Belemnites gracilis. 



Pinna lanceolata, Gryphfsa hullata and Astarte carinata appear to connect the clay 

 with the calcareous grit above, whilst Ammonites athleta and Belemnites ahhreviatus 

 seem to unite it with the Kelloways rock below. 



It is difficult to conceive what can have caused the sudden want of the peroxide 

 of iron, after the deposition of the Kelloways rock. Whilst the upper portion 

 of the latter is charged with so large a proportion, the blue clay above contains 

 none, the line of demarcation being as distinct as in any drawn section : the iron 

 reappears towards the upper portion of the clay, and gradually blends it with the 

 calcareous grit. 



The Oxford clay is of no utility in domestic oeconomy. It serves, however, as 

 an impermeable basis, resting upon which the calcareous rocks, forming our tabu- 

 lar hills, are converted into vast natural reservoirs. On the sides of these hills 

 the clay is rarely visible, but the numerous springs which issue forth form an 

 useful guide in separating it from the calcareous grit. 



In a future memoir, I purpose to illustrate the distribution of organic remains in 

 the remaining strata of the Yorkshire coast. 



