WESTLETON BEDS TO THOSE OF NORFOLK, ETC. 



Ill 



Woodward also places it in the same division as the Bure-Yalley 

 Crag. 



Although the Forest-Bed Series thins off to the north, the fresh- 

 water bed at the base of the Muudesley Series is prolonged, and 

 forms a definite zone whereby the relative position of the associated 

 strata can be fixed. These beds are in general thin, and the fossils 

 few and badly preserved, but at one spot, a short distance east of 

 Eunton Gap, Mr. Eeid found beneath them a bed of Crag abounding 

 in well-preserved shells (fig. 8). 



Forest-bed. 



The section he gives as under : — 



feet. 



(Laminated clay full of lignite, small twigs 

 and occasional fir-cones, and fragments of 

 Mytilus ? 



Mass of rolled clay-pebbles on uneven surface. ? 



/'Grey shelly Crag, in the lower part altern- 



I ating with thin loams about 4 



Way bo urn Crag. ■{ Bed of unworn flints mixed with clay, and 

 I con taining My a arenaria and Tellina ohliqua 



y in the position of life about 4^ 



Soft chalk with Paramoudras and rings of flint. 



His list of the Mollusca is the most reliable one we have for the 

 Weybourn Crag, for at this spot it is free from any possible inter- 

 mixture with the Pebbly Beds * : — 



LamelHbrcmchiata. 



Astarte borealis, Chemn, 



, oval var. 



compressa, Mont. 



iucrassata, Brocchi. 



crebricostata, Forbes. 



sulcata. Da Costa. 



Cardium echinatum, Linn. 



edule, Linn. 



groenlandicum, Chemn, 



Corbula contracta ?, Say. 



striata, W. S^~ B. 



Cyprina islandica, Linn. 

 Donax vittatus. Da Costa. 

 Leda oblongoides, S. Wood. 

 Lucina borealis, Linn. 

 Mactra ovalis, J. Shy. 



stultorum, Linn. 



Mya arenaria, Linn. 



truncata, Linn. 



Mytilus edulis, Linn. 

 Nucula Cobboldia;, Shy. 

 Pecten opercularis ?, Linn. 

 Pholas crispata, LAnn. 

 Saxicava aret ica, Linn. 



, gigantic var. 



Scrobicularia plana, Da Costa. 

 Tellina balthica, Linn. 



lata, Gmelin {T. calcaria). 



obi i qua. Shy. 



prrctenuis, Leaihes. 



Gasteropoda, 

 Buccinum undatum, Liom, 

 Bulla alba, Brown. 

 Cancellaria viridula, Fahr, 

 Chiton, sp. 

 Hydrobia (Paludestrina) subumbili- 



cata, Mont. 

 Littorina littorea, Linn. 



rudis, Maton. 



Melampus (Conovolus) pyramidalis, 



J. Shy. 

 Natica catena, Da Costa. 



clausa, Brod. cf Shy. 



helicoides, Johnst. 



Pleurotoma (Clavatula) linearis, Mont, 



turricula, Mont. 



Purpura lapillus, Linn. 

 Scalaria groenlandica, Chemn. 



Trevelyana, Leach. 



Turtonis, Turt. 



Tectura virginea, Miill. 

 Trochus tumidus?, Mont. 



, sp. 



Trophon antiquus, Linn. 



, reversed var. 



Turritella terebra, Mont. (= communis, 



Risso). 

 Velutina laevigata, LJnn» 



Bracliiopoda. 

 Rhynclionella psittacea, Chemn. 



* Mem. Geol Survey, p. 18. 



