VOL. XIV. (3) RHATIC ROCKS 253 
for examination by Mr William H. Edwards, the Curator, 
with specimens from Lassington, shows them to be 
lithologically identical—even as regards certain inclusions 
of a brown limestone. The Sarn-Hill specimen is des- 
cribed as a “concretionary nodule” in the Presidential 
Address referred to ; but those specimens from Lassington, 
in my collection, are portions of a bed—in other words, 
they are not concretions. Similar phenomena may, how- 
ever, be observed in the EAstherza-bed (Rhetic) of 
Wainlode Cliff; in one part of the section it is concre- 
tionary, in another part it is not so. The particular 
specimen in the Worcester Museum is, admittedly, more 
ossiferous than specimens of the Lassington bed in my 
collection; but besides the probability that a given bed 
may be more ossiferous in one locality than another, may 
be added the fact, that whilst the former was doubtless 
chosen on that account, the latter were not. 
The remanié bed at Lassington occurs, according to 
Mr H. B. Woodward, F.R.S., 11 feet 4 inches below the 
beds with Pszloceras planorbis, and is compared by that 
author to the ‘‘ Guinea-bed”” of Warwickshire, and con- 
sidered by him to suggest a slight unconformable overlap 
of the Lias. At Chaxhill, near Grange Court, I found a 
non in situ piece of rock, similar as regards lithic struc- 
ture to the Sarn-Hill and Lassington specimens ; but it is 
only at Lassington that the stratum can be seen zz sz¢z. 
Here, unfortunately, the exposure of the beds below is 
not satisfactory. 
In conclusion, then, it may be stated that these nodules 
are not “the equivalents of the ‘Bone-bed’ of the 
‘ Avicula contorta’ series,” because we know what the 
equivalent is; and that their PROBABLE stratigraphical 
position is at or near the base of the Ostvea-beds (fre- 
planorbis)—the beds full of Ostrea assica and Modiola 
minima. 
