76 PKOCEEDINGS OF THE GEOLOGICAL SOCIETX. [DeC. 21, 



Teredina personata, Lam., occurs in the wood, and traces of a 

 species of Cliona in the shells of the large Ostrea. A few specimens 

 of Pleurotoma have heen observed in the upper portion of this group, 

 but fossils are evidently rare. 



(2) Argillaceous Sands with DentaKum. — This group (marked D 

 on the Section, fig. 1) consists principally of thinly bedded strata of 

 greenish argillaceous sand more or less mottled and veined with 

 clay. It includes three or four zones of scattered concretional 

 Septaria, and terminates above in a double layer of claystone or 

 tabular Septaria. A layer of fine whitish sand about 5 inches in 

 thickness runs through the centre of the group and forms a marked 

 feature in the cuttings. 



The fossils of this group of strata include the following species : — 



Ostrea flabellula, Lam. Sjndosmya (Tellina) splendens, 



Pinna, sp. Sow. 



*Cardiuni Laytoni, Morris. *Tellina, spec. nov. 

 *Cultellusaffinis, Sow. — — , sp. 



*Cytherea suessoniensis, Besh. Teredina personata, Lam. 



*Leda substriata, Morr. Aporrhais Sowerbii, Mant. 



*Modiola simplex, Sow. Fusus, sp. 



Nucula gracilenta, S. V. Wood. Leiostoma globatum, Besh. 



, sp. Natica labellata, Lam. 



striatella, 8. V. Wood. , var. 



Panopsea corrugata, Sow. Pleurotoma, sp. 



Pholadomya virgulosa, Soiu. Eostellaria lucida. Sow. 



margaritaoea. Sow. Trophon tuberosum, Sow. 



*Pholas, spec. noT. (allied to *Dentalium, spec. nov. 



Levesguei). * , Tar. 



*Solen (large species). *Tlienops scyllariformis. Bell. 



* sp. «JBryozoon. 



These fossils occur dispersed throughout the sands. The speci- 

 mens of Panopcea, Pholas, and Pholadomya occur in the position in 

 which they lived, and with their valves united. The species marked 

 with a star are restricted to this group ; the rest range higher. 



(3) Sands with Liugula. — This group of sands deserves special 

 notice on account of the number and variety of its fossils. It 

 includes the following beds : — 



E. Greenish sands with thin layers of clay 5 feet. 



F. One or more thin layers of greenish chloritous sand, 



crowded with fossils, and resting in places on a thin 



layer of clay 1 to 3 inches. 



G. Greenish sand, finely stratified, with one or more layers of 



' shells , 3 feet. 



The abundance of green matter in these sands is very conspicuous. 



Concretions of shell-rock many feet in length occur along the 

 line of sand and shells at F, sometimes including and sometimes 

 resting on, or appearing to be suspended from, the layer of shells. 

 This shell rock, which has very much the appearance of Bognor 

 rock, is so hard as to require blasting. 



More than eighty species of fossils, several of which are new to 

 the English Eocene strata, have been obtained from this group of 

 strata. A few of these, such as Lingula tenuis, Sow., and Panopcua 



