at Black Yen, Charmouth. 129 



sand of the beds known as ' Foxmould ' in the zone of Schloenhachia 

 rostrata. This cliff immediately underlies the road, and is the 

 seaward face of a large mass of land which has slipped bodily down 

 the cliff, forming the fault shown in the diagrammatic section of 

 Black Ven (see Fig. 2, p. 127). 



About 250 yards west of that just described is a section showing 

 the upper part of the zone of Hoplites interruptus and the lower part 

 of the zone of Schloenhachia rostrata. The cliff arises from the 

 platform of boggy ground mentioned early in this paper, and is 

 about 70 feet high, the top being formed of ' Foxmould ' just above 

 the highest layer of ' Cowstones.' The details of the beds in the first- 

 mentioned zone are shown in the following figure (Fig. 4, p. 130). 



Bed 2. This bed agrees lithologically with that numbered 2 in 

 the eastern section ; and being, as far as can be determined, at the 

 same height, is obviously identical with it. Thus the two sections 

 are continuous, and the whole thickness of the zone is exposed. The 

 total thickness of this bed is probably about ten feet, and so the 

 sections overlap for three feet, two feet being hidden below the 

 western section, and three having been removed above the eastern. 



Bed 3. This is the most interesting bed in the zone, for it 

 abounds in fossils in its lowest part. The nearest locality whence 

 abundance of Gault fossils has been obtained is distant about thirty 

 miles at Okeford Fitzpaine, where the lower beds have been 

 recognised ^ as belonging to the zone of Acanthoceras mammillatum 

 (Schlotheim), which is there five feet in thickness. So it is possible 

 that beds 1 and 2 may represent this zone on Black Ven, but the 

 absence of fossils makes this point impossible to decide. 



Of the fossils from bed 3 a list is given in the Survey Memoir.^ 

 But in addition the British Museum has the following species 

 located from here : — 



Astarte sp. Nucula albensis, d'Orbigny. 



Crassatellites gracilis, Sowerby. Fecten [Syncyclonema) striatopunctatus (Mantell)^ 



Gervillia Forbesiana, Sowerby. Pholadomya sp. 



Lucina sp. Tellina sp. 



Meretrix sp. Thetis minor, Sowerby. 



Modiola albensis (d'Orbiguy). Thracia sanctcB-crucis, Pictet & Campiche. 



Modiola aff. subsimplex, d'Orbigny. 



The following, too, have been found by the author, which are 

 neither in the list in the Survey Memoir nor in the British 

 Museum : — 



Cuspidaria sanctce-crucis, Pictet & Campiche. Lingula subovalis, Davidson. 

 Ostrea sp. Shell of a Cirripede, ^ Scalpellum, sp. 



Avellana injlata, d'Orbigny. 



By far the commonest fossils are Fecten orbicularis, Sowerby, Lima 

 parallela, d'Orbigny, and Inoceramiis concentricus, Parkinson; but 

 Grammatodon carinatus (Sowerby), Pinna sp., and a small Gasteropod, 

 ? Fusiis, were plentiful. 



1 E. B. Newton, "Cretaceous Zones in Dorset" : Geol. Mag., 1896, p. 198, and 

 Proc. Dorset Nat. Hist, and Ant. Field Club, vol. xviii (1897), p. 66. 



2 Jukes-Bro-mie : loc. cit., p. 188. 



DECADE V. — VOL. I. — NO. III. 9 



