18 ; Proceedings. 
other facts, the Upper Tremadoc of N. Wales would in the 
future have to be classed with the Arenig beds. 
The Tremadoc Slates in Shropshire are known as the Shine- 
ton Shales. These beds had always been considered to be of 
Bala age until the year 1874, when Dr. Callaway communicated 
a paper to the Geological Society entitled “ On a Trermadoc 
Area near the Wrekin in South Shropshire, with a description 
of a new fauna.” In 1877, after Dr. Callaway had collected 
further fossil evidence, the Tremadoc Slates age of the beds 
was acknowledged. The shales strike N.E. 8.W., and are 
found on both sides of the Longmynds and on the E. and 8. 
sides of the Wrekin. 
Their greatest length is about 8 miles in each district, and 
their greatest width about 2 miles. 
The shales are nowhere found resting normally on the 
Lingula Flags as in N. and 8. Wales, but they either rest un- 
conformably on, or are faulted against, far older beds. Near 
the Wrekin and Little Caradoc they rest on the Hollybush or 
Jomley sandstone, which is of early Cambrian age and con- 
tains the Olenellus and Paradoxides faunas. On the W. side 
of the Longmynds they are faulted against a volcanic series, 
and here they are succeeded by the Stiper Stones, a massive 
quartzite of Arenig age; in other parts, Bala, Llandovery, 
Permian beds, and even the Coal-measures, rest on them. 
The shales are of a dark blue colour, which weather to olive 
or yellow ; sometimes the shales are covered with a film of iron- 
oxide. They are micaceous, thin-bedded, soft, and rather 
fissile. At the top of the series the shales are slightly more 
arenaceous and thicker-bedded. 
The chief fossils which have been found in this locality are 
Conocoryphe monile, Salter. | Asaphellus Homfrayi, Salter. 
Olenus Salteri, Call. Platypeltis Croftii, Call. 
Olenus triarthrus, Call. Conophrys salopiensis, Call. 
Agnostus dux, Call. Lichopyge cuspidata, Call. 
Lingulella Nicholsoni, Call. | Macrocystella Marie, Call. 
Obolella. Dendrograptus. 
Theea. 
