VOL. XIV. (2) RHAETIC ROCKS 135 
occasionally traversed by vertical veins of Baryto-Celestine. 
My determination of this mineral has been confirmed by 
Mr James Parsons, B.Sc., F.G.S., who further stated that 
it was deposited on calcite. Baryto-Celestine has not 
previously been recorded from this section. 
A definite paleontological horizon is now reached, one 
marked by an abundance of Lamellibranchiata, the tests of 
which are frequently replaced by iron pyrites. The usual 
thickness is one foot, but a maximum of 15 inches is 
occasionally attained. 
The superincumbent stratum is a sandstone band, in 
places very pyritic, micaceous, non-calcareous, in one or 
two seams. “ Pudlastra” occurs in casts. When exposed 
the rapid decomposition of the sulphide of iron soon 
reduces the stratum to sand. Above six inches of shale 
iS an intermittent sandstone band, sometimes an inch 
thick, in which the successive directions of the currents 
are well exhibited.‘ The next deposit in ascending order, 
is a deposit of black shales, at first non-laminated, but 
later conspicuously so, constituting a feature in the 
cliff. About one foot below bed 7 these shales contain in 
considerable numbers Avzcula contorta and other lamelli- 
branchs—otherwise they appear unfossiliferous. About 
this horizon the ophiuroid, Ophzolepis Damest, was 
obtained at Pylle Hill, Bristol, but I have been unable to 
detect it at Wainlode. 
The above details have been previously described as 
“black shale and clay, 9 feet” (some authors 8 feet), z.e., 
beds 14 to 7 inclusive.’ 
Capping these shales is the most massive limestone 
band in the Lower Rhetic of this section. It is known 
locally as the Pecten-bed, or Lower Pecten-bed. Normally 
1 These sandstone bands are here very clearly separated, but this is not the case in 
sections to be shortly noticed. 
2 Beds 16 to 7 were examined in a clough near the centre of the section. 
