80 



GEOLOGY OF TUE ISLE OF WIGHT. 



Ft. In. 



greenish marly clay, with bands of Paludina 



Sandy clay, with Melania muricata, M. turritissima, Mela- 

 nopsis, 3 inches thick, resting on sandy clay, almost entirely 

 composed of Melania inuricata, with a few broken Cyrena, 

 and some Melanopsis - - - -04to0 



Bluish irregular shaly clay, with selenite. A band of Melania 

 turritissima and Melanopsis carinata, 2 inches from the top, 

 Paludina -._-.-. 



Indurated 

 lent a 



Greenish clay, with 2 bands of broken Cyrena obtusa, and C. 

 semistriatu, and on the top a bed of Melania muricata, 

 with scattered Melanopsis. and occasional Cerithimn 



Green clays, Melania turritissima, With, scattered Melanopsis and 

 Melania muricata, mixed with patches of Cyrena semistriatu, 

 C. ohovata, Fish remains, &c., about the middle 4 inches 



Green clays, with Melania muricata, M. turritissima, and 

 numerous Melanopsis carinata and Paludina lenta - 



Verdigris-green clay, with Cyrena semistriatu 



Bright-green clays, with Cyrena semistriatu on the top 



Bluish-green clays, with bands of Melania muricata and 

 Cyrena ohovata --...- 



Hard, sandy green marl, with scattered Cyrena semistriatu - 



Verdigris-green clays, with 5 bands of Cyrena semistriatu and 

 Melania ....... 



Greenish clay, with 2 marked bands 1 and 2 inches thick, 

 full of Melania muricutu (small var.), occasional Cyrenu 

 pulchra, and a few Cyrena semistriatu . . - 



Green clays, with Cyrenu semistriutu (finely preserved) C. 

 pulchru and ]\Ieluniu . . . . . 



Dark clay, with soft green sandy concretions, 6 inches ; 

 greenish clay 1 foot. Scattered Cyrenu obovata 



Blue clay, with small Cyrenu (obovata ?), Meluniu muricatu, 

 and Melanopsis ...... 



Bembridge Limestone in 3 beds, with softer beds between, 

 forming a ledge (Hamstead Ledge), out at sea, in the 

 direction of the Buoy, and containing numerous Limnceu 

 longiscutu, Chara, &c. 



3 



4 6 



9 



1 



1 6 



1 



9 



1 6 



1 



Total of Bembridge Marls 



W 6 



Forbes gives the total as nearly 75 feet, but it is difficult 

 to obtain exact measurements in these soft beds. A recent 

 measurement in the cliff above Hamstead Ledge gave 82 feet, so 

 probably Forbes was nearly correct. 



Though not mentioned in the above section, the thin seam full 

 of Hydrohia Chastcli v^ill be found about 5 feet under the Black 

 Band. The marine bed with Ostreu at the base of the series, 

 was recorded by Forbes ; but marine fossils are not abundant, and 

 like most of the subdivisions in the Oligocene series, this bed also 

 tends to become more estuarine towards the west. 



On the southern side of the syncline, the Bembridge Marls 

 rise from below the Hamstead Beds due north of the point where 



