229 
they existed, have left no trace behind them. Other Geologists 
attributed it to marine action, but the sea had left no trace, 
_ and in the combes and hollows of the hills no trace of a marine 
beach could be found. In the beds of gravel the shells found 
belong to land and fresh water species; so that there only 
remain sub-aérial agencies to account for the changes which 
have taken place. 
The party then visited the various sections on the hill, 
making a prolonged stay at the “Cephalopoda” bed, which 
had been purposely quarried to enable members to obtain 
characteristic fossils. 
On leaving Cam Down the Club partook of luncheon at the 
Bell Inn, Dursley, after which the carriages conveyed the party 
by way of Stinchcombe and Nibley to near Westridge Wood, 
to enable the members to see a British Camp on the summit of 
the hill. The Camp occupies an area of about four acres, 
enclosed by two ramparts. Surrounding it are numerous 
remains of pit dwellings, which have been brought to view by 
_ the clearance of the woods. At one spot there isa group of 
four large pits, nearly circular in form, having a diameter of 
_ 100 feet. They appear to have been from seven to ten feet 
deep, but are now filled with stones and stumps of trees. Mr 
_ Wirrs remarked that previous to the examination of this Camp 
_ he had entertained some doubts as to the genuineness of these 
pit dwellings, but that now his doubts were entirely removed. 
_ Some tracings from the map of the Geological Survey, sent by 
Mr J. H. Cooxs, proved very useful as a guide to the Camp, 
_ the paths to which were very accurately shown. 
The party having re-entered their conveyances, drove to 
-Tait’s Hill quarry, near Dursley. This quarry is placed in the 
_ zone of the “ Middle Lias,” which is divided by Geologists into 
. five sub-zones, each distinguished by an Ammonite, which is 
regarded as characteristic of the zone in which it is found. 
The quarry has been regarded as belonging to the second or 
zone of Ammonites margaritatus, the upper or zone of A. spinatus 
_ being thought to be wanting. Mr Wircneti and others were 
however of a different opinion, and it was not long before 
