50 THE CARBONIFEROUS LIMESTONE OF SOUTH-WEST GOWER 
the only one in which I came upon any trace of the waning 
order of Trilobites. Of the four genera known to exist in 
the Carboniferous Limestone, viz. Phillipsia, Brachymeto- 
pus, Cyphaspis, and Griffithides, thus far I have discovered 
only the first in the Gower Limestone. 
In this Sub-zone evidence of upheaval and 
shallow water conditions is, I believe, discoverable (vide 
note). 
From Overton to within half a mile of Worm’s Head, a 
distance of about 5 miles, the beds extend without dis- 
placement, and, as in other limestone districts, are pierced 
by caves, which at Paviland, not far from Rhosilly, have 
yielded a rich harvest of Pleistocene mammalian relics. 
Near the Worm’s Head a fault occurs, and lower beds 
are thrust up. Unfortunately, however, the Syringoihyris 
Zone (Zone C with horizon y), of Dr. Vaughan, is buried 
under turf and debris, so that no opportunity of examining 
it occurs, and it is impossible to determine whether the 
sequence between and is continuous. 
ZAPHRENTIS ZONE. 
Sub-zone 
Just below the coastguard look-out at Worm’s Head, 
where a sharp anticlinal curve appears, beds referred to 
Sub-zone Z^ crop out on the shore, composed of a series 
of flags, about 100 feet in thickness, with two thin but well 
marked veins of chert near the top (15).^ Almost the only 
fossils in the wLole of this series appear to be Syringoihyris 
aff. larninosa, Productus aff. semireticulatus, and possibly 
Conocardium. 
Syringoihyris is thickly scattered over the surfaces of 
some of the flags, and good specimens can be procured 
weathered out. 
1 Vide Section C, on page 45. 
