18 
No. 80 terminates the Lias, the strata below, from 
31 to 48, belong to the group termed Rhetic, which is 
now separated from the former, of which more will be 
said presently. The latter were ascertained to occupy 
their true position by means of a shaft sunk for that 
purpose. The higher ground round Wilmcote and Binton 
is capped by the Lima beds, so that if an entire section 
was exposed we should have a tolerably complete repre- 
sentation of the more calceoreous' portions of the lower 
Lias down to the Red Marl. The district is more-or less 
affected by small and often local faults, so that certain 
beds in one contiguous quarry are absent in another. 
The limestones are of much economical value, being 
largely employed for flooring, paving, grave-stones, and 
walls, and making hydraulic cement, to which purpose the 
Lima series at Harbury are also used by the same pro- 
prietors. They make good paving-stones, many of the 
slabs raised being of large size, but they do not weather 
well when used for grave-stones. Some of them might 
be profitably used (like some of the Purbeck limestones) 
for lithographic purposes ; with this view I sent up some 
specimens to the Exhibition in 1851. With the exception 
of remains of insects, and fragments of plants, the fossils 
are entirely marine, the species of Ammonites, A, planorbis, 
and A Johnsoni, being abundant and characteristic, and 
a few other shells occur both in the shales and lime- 
stones. Crustacea belonging to the genera Astacus and 
Eryon, the latter of great size, are not unfrequently 
met with in the insect beds. The most common 
fish are the small Pholidophorus Stricklandi and 
Tetragonolepis, a very fine and entire specimen of 
which is now in the Warwick Museum. The large 
Enaliosauorians are well represented by some fine speci- 
mens of Ichthyosaurus and Plesiosaurus, the P, megace- 
