205 
APPENDIX I. — AMMONITES FROM THE SCARBOROUGH LIMESTONE. 
The strata which Queiistedt called the Coronateii-schichten, 
the strata of the Blagdeni zone (formerly Humphriesianum zone, 
m part) are only well -developed in the South of England in the 
neighbourhood of one locality, Sherborne, in Dorset, where they 
are very fossiliferous. But their preservation is very local, even 
close around the town.^ Southward some 20 miles, at Burton 
Bradstock. there is some evidence for these strata- : but from 
Sherborne northwards to Yorkshire, a distance of nearly 300 miles 
must be travelled (and more along the Inferior Oolite outcrop) 
to find the next place where the Coronaten-schichten have been 
preserved. Over most of that long interval it is known that these 
strata have been removed by pene-contemporaneous erosion. 
It is just possible that the Hibaldstow beds of the Lincolnshire 
Limestone may be a deposit of this date :^ but they are almost 
worthless to the palaeontologist. 
The Scarborough Limestone yields some Ammonites \Nhich 
fix its date — this has been long known from the species figured in 
Morris and Lycett's work."^ As deposits of this date are so rare 
in this country, and as Mr. Richardson has submitted certain 
specimens which the authorities of the Scarborough Museum have 
kindly forwarded to him, and others which Mr. R. S. Herries 
kindly lent him. it may not be without interest to review the 
evidence. 
1. SkIRROCERAS ? TRIPTOLEMUS, BeAN MS. Sp. 
Ammonites triptolemus. Bean MS. teste Morris and Lycett. 
1850, Ammonites braikenridgii, Morris and Lycett (non Sowerby), 
Great Ool. Moll., (Pal. Soc.) p. Ill, PI. XIV, Fig. 1. 
1 Quart. Journ. Geol. Soc, 1893, Vol. XLIX, pp. 492 et seqq. 
2 Ibid. 1910, Vol. LXVI, pp. 65, et seqq. 
3 The Lincolnshire Limestone is so unfossiliferous that its dating is very uncertain. The following 
is approximate : — 
The date of the Barnack Rag as post discitce is fairly certain ; and that of the Lincoln Silver Bed 
as discita is positive. 
BY S. S. BUCKMAN, F.G.S. 
sauzei 
Witchelliae ) 
Shirbuirniae / 
post discitje. . 
discitae 
blagdeni 
Strata 
.Hibaldstow Beds 
. Kirton Beds 
• Freestone Bed of the "Lings" 
.Barnack Rag 
.Lincoln Silver Bed 
4 Great Ool. Moll. (Pal. Soc), 1850. 
