fiose— Valley-Deposits of the Nar. 11 
Oyster-shells are met with in a layer at the depth of 12 feet 
within the clay; and beneath them Aporrhais pes-pelecani, 
and other molluscs, are plentifully interspersed. In this bed, 
also, some blackened fragments of wood occur. 
3rd. The above two beds lie upon a blackish sand of the Lower 
Greensand. 
No. 1 of this section exhibits a portion of the south-western shore 
of the former marine creek; and the pit in the Walton field near 
Narford, described in my original ‘ Sketch of the Geology of West 
Norfolk,’* leads me to consider that spot to be a part of the north- 
eastern margin of the same creek. The outline of this deposit may 
be readily traced on the Ordnance-map of the district. To my 
‘Sketch’ I added a copy of that portion of the map. 
I believe that I have now exhausted my memoranda relating 
to this deposit ;+ I have before stated that its traced length is 
about nine miles, its average breadth is less than a mile. It is 
dificult to determine its thickness; I was informed at West 
Bilney, that, when sinking a well, shells were brought up from 
the depth of 40 feet. 
Organic Remains from the Post-tertiary Deposits of the Valley of 
the Nar. 
Vermilia triquetra (on Ostrea); West Bilney. 
Ostrea edulis; the majority large old shells ; at all the localities. 
Cardium echinatum, rare; East Winch. 
C. edule; East Winch and West Bilney. 
Corbula nucleus; East Winch and West Bilney. 
Mactra subtruncata ; East Winch and West Bilney. 
M. solida; West Bilney. 
Mytilus edulis ; Pentney- Warren. 
Pecten varius; West Bilney and Walton Field. 
Tellina solidula; West Bilney and East Winch. 
T. proxima; Tottenhill. 
Cerithium reticulatum ; West Bilney. 
Turritella communis ; West Bilney and East Winch. 
Nassa incrassata ; West Bilney. 
Aporrhais pes-pelecani; very abundant at all the localities. 
Litorina litorea; very numerous, of all ages, and at, all localities. 
L., litoralis; rare ; West Bilney. 
Natica nitida; abundant, of all ages ; West Bilney and East Winch. 
Pleurotoma septangularis; rare; Pentney. 
Scrobicularia piperata (F. and H.); Pentney. 
Mya arenaria, jun. ; a fragment; Pentney. 
Montacuta bidentata; Pentney. 
Hydrobia ulve; Pentney. 
* London and Edinb. Phil. Mag., vol. vil, Jan. 1836, pp. 197-199. 
{ See also Mr. Trimmer’s remarks on these Post-tertiary deposits of the Nar and 
neighbouring valley of Gaytonthorpe, Geol. Soc. Journ., vol. xvii., pp. 23 & 26. 
