SECTIONAL TRANSACTIONS.—C. 475 
Protolenus-, Strenuella-, and Eodiscus bellimarginatus-Limestones. Un- 
fortunately, they are much disturbed by strike faults or differential sliding, 
but are well seen in an excavation 200 yards to the south. Below these 
come (ii) the Callavia Beds, as we now call the Olenellus Limestone of 
Lapworth, which graduate downward into the Lower Comley Sandstone. 
The five calcareous beds carry very distinct faunas and are regarded as 
representing five separate faunal horizons. 
The Lower Comley Sandstone is seen on the west. It is a green, fels- 
pathic and micaceous rock estimated at 450 feet and includes some bands of 
shale. It is not, as previously supposed, unfossiliferous. ‘The base of this 
sandstone formation merges, by interpolation, into the Wrekin Quartzite. 
SECTION of GoMLEY LiMESTONES at Excavation N22 
WD De 47 “Sy PAGS BG 2B gol? 
FEES 
E Surtace of rield: 
oh 
M. CAMBRIAN. 74 L* CAMBRIAN. 
Pa) 
eS ah os 
The evidence for the inter-Cambrian unconformity is indicated in this 
quarry, (1) by the abrupt change in the lithology from fine-grained felspathic 
sandstones to coarse quartzose grits, (2) by the complete change in the faunas, 
(3) by the finding of fossiliferous fragments of the pre-existing Lower 
Cambrian rocks in the conglomerate at the base of the coarse grits. 
Further afield in Robin’s Tump these same grits are seen to rest with 
discordant strike and dip upon sandstone beds that are estimated to be 
100 feet below the Lapworthella Limestone. 
A more striking exhibition of the unconformity is seen within 200 yards 
of this quarry in the ‘Comley Breccia Bed,’ where the matrix carries 
a younger Middle Cambrian fauna (the P. tessini fauna of Scandinavia), 
while the included blocks consist almost entirely of Lower Cambrian 
Limestones and Sandstones. 
The characteristic Lapworthella nigra of the Lapworthella Limestone was 
