362 WILMORE : THORNTON; MARTON AND BROUGHTON-IN-CRAVEN. 
I have recently obtained good specimens of Z. ambigua (kindly 
identified for me by Mr. Carruthers) from the very lowest beds 
of Rain Hall, and it would seem that this variety predominates 
there. Still I have not been able to find corals in anything like 
the numbers I have obtained at Thornton. In the latter place 
densa seems to predominate. These beds I propose to call the 
Zaphrentis stage. The third stage is characterised by the 
abundance of Caninia coniucopice in a crinoidal breccia. This 
occurs well up in the Rain Hall beds, but nearly at the base 
of the Gill Rock beds. It also occurs in the new quarry near 
Long Ing. 
In this bed at Rain Hall there are occasional shells and rarely 
a species of Michelinia ; at Gill Rock the same shells and the same 
Michelinia are found. This Caninia bed has exactly the same 
appearance in every respect in the three quarries mentioned, 
and where it has been weathered the appearances are also ex- 
actly- the same. There can be little doubt of its identity in 
these exposures. In this stage I should include the dark, almost 
" unfossiliferous " foraminiferal limestone, which immediately 
overlies the Caninia bed in the three quarries. We should 
thus have the following sequence : — 
Lower Pendleside Beds. 
r Caninia stage. 
Upper Dibunophyllum sub-zone : - Zaphrentis stage. 
I Crenistria stage. 
I realise that this is orAy provisional, and that a great deal 
more work must be done in these somewhat unfossilferous and 
disturbed strata before one can correlate more decidedly with 
the beds of the other provinces. 
II. — Second Series of Exposures. 
We now come to the series of exposures immediately north 
of the probable fault which runs from near Bracewell to the 
country north of Broughton. The evidence for the existence 
of this fault is given in the Geological Survey Memoir on 
the Burnley Coalfield, pp. 30 and 3L I do not accept the 
