72 GREEN OR CHLORITE SAND. 



3. Brown sand, with nodular concretions of sand, enveloping traces of 

 zoophytes. 



4. Yellowish brown friable sandstone, which hardens by exposure to the 

 air ; it contains numerous casts and impressions of bivalves and univalves. 



5. Indurated sandstone of a deep brown colour, enclosing irregular 

 nodules of ironstone. 



6. Sand and sandstone to an indeterminate depth. 



The fossils discovered in these strata, consist of the casts and im- 

 pressions of many kinds of univalves and bivalves ; and these occur in the 

 greatest perfection in the more compact masses of the sandstone. Of the 

 shells themselves not the shghtest vestige remains, the cavities they 

 formerly occupied being still empty : a circumstance that proves their 

 destruction must have been effected by some chemical agent, subsequently 

 to the consolidation of the sand, which now so beautifully retains their 

 forms and markings. 



By a careful comparison of the casts with the corresponding im- 

 pressions, the following have been identified. 



Organic Remains from Parham Park. 



1. Fragment of an Echino-spatangus. 



2. A small species of Patella, of an oval shape, conical, depressed ; the 

 casts of the interior of the shell only have been discovered. 



3. 'RosteWaria Par kinsoni. Org. Rem. vol. 3. tab. V. fig. 11. It is 

 evidently of the same species as the siliceous rostellarite of Devonshire, 

 figured by Mr. Parkinson, and is readily distinguished by its alated outer 

 lip with one spur-like process : the wreaths are from six to seven in 

 number, and are shghtly costated longitudinally. 



4. Natica ? A cast one inch long, the outer whorl being seven-tenths 

 of the whole : volutions four or five. It very closely resembles the nerite, 

 figured by Faujas St. Fond. Hist. Nat. de la Mont, de St. Pierre, PI. 

 xxviii. fig. 2. 



5. Fragments of a species of Dentalium, 1 '5 inch long, and 0*3 inch in 

 diameter, at the largest extremity. 



