VOL. XIV. (2) RHETIC ROCKS 173 
not substantiate them, it suggests a fault. Indeed, the 
whole district between Minsterworth and Hasfield appears 
considerably affected by faults, but much detailed mapping 
would be necessary before they could be accurately 
delineated. For the purpose of correlating sections in 
the Tewkesbury district, reliance may be placed upon 
lithic structure: this point has been proved from the 
paleontology. In the same district it will have been 
noticed that there is a remarkable persistency in the dis- 
tribution of the beds, with a tendency to thicken as they 
are traced northwards to Bourne Bank. 
The important question concerning the upward and 
downward extension of the Rhzetics, may be briefly referred 
to. In North Gloucestershire, the line of junction between 
these rocks and the Upper Keuper appears obvious—at 
the top of the “ Tea-green Marls.” There is not the least 
passage between the two series, palontologically or 
lithologically : on the contrary, the line of division is very 
sharply defined. The two series appear conformable to 
each other, but that fact is no proof that the sequence is 
complete. The “Tea-green Marls” graduate downwards 
imperceptibly, into the red marls—this phenomenon is 
well exhibited at Wainlode Cliff. The exact limit of the 
upward extension of the Rhetics is not so obvious. The 
limestone which caps the pale brown and grey shales at 
Wainlode and Garden Cliffs, has a decided Liassic facies 
in all respects, consequently I consider that stratum the 
basement bed of the Lower Lias. Moreover, from the 
evidence already advanced in the description of the above- 
mentioned sections, I would relegate the shales to the 
Upper Rhetic. In North-west Gloucestershire such a 
classification meets with no adverse facts. 
In conclusion, I would express my thanks to Mr W. H. 
Wickes, of Bristol, for assistance in certain paleontological 
matters, and to Mr Montagu Browne, F.G.S., of Leicester, 
