276 Mr. H. Seeley on the Fossils of the Hunstanton Red Rock. 
XXXIIT.—On the Fossils of the Hunstanton Red Rock. 
By Harry Seevey, F.G.S., Woodwardian Museum, Cambridge*, 
Tue evidence of a rock’s age derived from fossils can never be 
quite conclusive, and never rank as equal in value with sectional 
evidence; for the testimony of different species is of unequal 
importance. And so the opinion formed from a mere glance at 
the facies of a fauna may be of more value than elaborate tables 
of the range of species. In this way the Red Rock fossils may 
be said to have an Upper-Greensand character, with some resem- 
blance to Gault; but the same thing would be remarked, only 
on the latter clause more emphatically, of the Cambridge Green- 
sand. 
The fossils in the annexed list are all from Hunstanton, and 
my own collecting: they are to be seen in the Woodwardian 
Museum. 
The rock is divided into three well-marked layers, nearly 
equal in thickness. In descending order, they are numbered 
1, 2, 3; and in the fifth column of the table a first attempt is 
made to refer the species to their places in the section. 
Upper 
Chalk. | Green- |Peculiar. | Gault. Bed 
sand. 
Polyptychodon | 
Ichthyosaurus campylodon, Ctr,,.|  * x ae Pa is 
Otodus appendiculatus, Ag... .... * * 3 
Edaphodus Huxleyi, Seel. ...... ne * 3 
SCH VOAUS saat ook vary ce ee ee * 
Belemnites attenuatus, Sow. is * all 
Belemnites mmimus, Sow. ..,.,. * * all 
Ammonites splendens, Sow....... * * 3 
Ammonites Studeri, Pictet ...... * ne 3 
Ammonites serratus, Park. ....,. * * \"3 
Ammonites Guersantii, Pictet....| .. * * 3 
Ammonites rostratus, Sow. ...... * * AG * 2 
—— VALS Ca taeeh een. ee * 
Ammonites ochetonotus, Seel.... * 2 
Ammonites solenonotus, Seel..... * 2 
Ammonites spherotus, Seel. ....)  .. oe * Fic 2 
Ammonites proboscideus, Sow. ..| .. i Sc ** 3 
2?Crioceras occultus, Seel. ........ ae we * 
Nautilus simplex, Sow........... oe * ate 2,3 
Rostellaria Parkinsoni, Sow....... * * te * 3 
Pleurotomaria 
IDM So odonee Coats Gade on Gi 2 
Cerithium ornatissimum, Desh. ..| * * * 3 
Plicatula minuta, Seel........... a * 1 
Plicatula sigillina, Woodw. ...... * * all 
* Communicated by the author, having been read before the Cambridge 
Philosophical Society. 
