39 
limestone, or Upper Llandovery, and the Caradoc sand- 
stone, are here all exposed in one continuous series. 
From the Purple Shale have been collected Cheirurus 
bimucronatus , Encrinurus punctatus and variolaris , a 
new species of Proetus , Orthis biloiba , Beyrichia tuber - 
culata, Leptcena Icevigata and trans vers alls, Strophomena 
pecten , Atrypa reticularis , and Petraia bina. 
The Pentamerus limestone is here a very thin band, 
■ only two or three feet thick, and can only be reached 
when the water is very low. It occurs nearly in the 
very centre of the section. 
The upper beds of the Caradoc sandstone (which 
formation belongs to the Lower Silurian series) are here 
j very rich in interesting fossils ; the best spot is immed- 
f iately under a large tree growing out of the rock at the 
> extreme west end of the cliff. There, portions of 
Trinucleus concentricus literally swarm, and many perfect 
ones have been obtained; also one entire specimen of a 
new species of Ampyx , and several fragments of Illcenus 
Davisii , and Remopleurides radians. All shells are scarce 
; at this place, but a little lower down, the rock is full of 
them; in many places they are so numerous that the 
stones have been burned for lime; they are then locally 
icalled “Jacob’s stone.” 
A short distance higher up the river is a high cliff, 
and at this place was first found, by Professor Thompson, 
i the curious fossil, Splicerospongia hospitalis. It has only 
| yet been obtained from here in one narrow band. There 
are many species of shells here, and in good preservation. 
A short distance from here is Longville Common, the 
side of which, facing the stream, is covered with blocks 
of stone (occupying the centre of the Caradoc sandstone); 
they are in general very barren; still, from them has 
been obtained Asaphus Powisii , Homalonotus bisulcatus 7 
Orthis spiriferoides , 0. elegantula , 0. testudinaria , 
Strophomena grandis , S. expansa , Bellerophon bilobata . 
