Strata between Durlstone Head and Old Harry. 87 



Cyclas media 



membranacea 



Cypris tuberculata 



Valdensis 



Exogyra P in brown clay 



Melanopsis P attenuata, in blue clay 



— tricarinata, in blue clay 



Ostrea ; a plicated species. In a bed of stone 

 subordinate to the weald clay, the greater 

 part composed of shells, with a striated bi- 

 valve, (a Cardium P) 



Ostrea ; a smooth species 



Paludina acuminata 



elongata (with Cyclas media) 



Unio 



Cyclas media ; Sand cliff between Swanage and' 

 Pemfield. In nodules of clay iron ore, with 

 Paludinte. 



Unio, one or more species between Pemfield and 

 Swanage. 



Wealden, Pemfield. 



Hastings sand. 



To this list I add, on my own authority, collected on the 

 7th November, 1837, the following. Vermeius concavus, Den- 

 talium medium, Trigonia rugosa, Ammonites varicosus, A. 

 marginatum ; all from the lower green sand: Solarium orna- 

 tum, and a Mytilus, from the gault : besides a huge Ammon- 

 ite, and some other characteristic shells, from the lower chalk 

 at Pemfield. 



Whether ' theorists' may or may not identify the c stripes of 

 red sand, and stripes of yellow sand,' with what are called 

 Hastings sands, it is, at any rate, certain, that Dr. Mitchell 

 ought not to have set up for a critic upon the point, until he 

 " had heard of any fossils being found in them.'" He tells us 

 that he found [at Pemfield], " at the point of junction near 

 the sand " (and chalk), " an immense mass of debris, thickly 

 overgrown with grass. The theorists say that the green sand 

 formation is there : i" saw none of it? ! The only wonder is 

 how he could avoid seeing it. The disengaged blocks and 

 pebbles of the upper green sand, (as green as the 'grass' which 

 he did see), lie in all directions amongst that debris ; and the 

 extent of the beds may be distinctly traced, not only at the 

 point of junction, but up the steep pathway to the top of the 

 cliff, and along the fields to the road from Studland to Swan- 

 age. But Dr. M. saw nothing but grass. I should have sup- 

 posed that he must have seen the rushes also, that distinctly 

 point out the existence of the black bed of gault, that lies be- 

 tween the upper and lower green sands ! 



Professor Sedgwick, in a letter to me dated 13th Nov. says 

 " So your opponent denies the existence of green sand be- 

 tween the Ballard Head chalk and Swanwich Bay ! Now it 

 Vol. II. — No. 14. n. s. h 



