54 THE CARBONIFEROUS LIMESTONE OF SOUTH-WEST GOWER 
ZAPHRENTIS ZONE, Z, AND Z^. 
has a typical development at Rhosilly. 
Fauna — 
Zaphrentis aff. Phillipsi (rare). 
Productus cf. Martini. 
CJionetes cf. hardrensis. 
Orthotetes crenistria. 
Spirifer aff. dathratus. 
Leptena analoga. 
Zg is only suggested by the special forms of the few 
fossils found in the beds above the preceding sub -zone 
at Worm’s Head, viz. — 
Productus aff. semireticulatus. 
Syringothyris aff. laminosa. 
(?) Conocar dium alaeformis. 
HORIZON 7 AND SYRINGOTHYRIS ZONE ; 7, AND C^. 
It is extremely unfortunate that Dr. Gubbin was unable 
to collect from these beds. It is consequently unknown 
whether the series is continuous between Z2 and Si, and 
also whether there is any distinct evidence of shallow 
water conditions in West Gower at the epoch when the 
neighbouring areas were subject to great physiographical 
disturbance. 
HORIZON S AND THE LOWER SEMINULA ZONE 
8 AND S . 
Exceedingly well exhibited in the Overton Section. 
Fauna — 
Seminula jicoidea 
Giganteid Producti 
Choneies papilionacea 
Lithostrotion Martini and vars. 
Indicate the 
establishment 
of the 
Visean fauna. 
