68 PROCEEDINGS Ol' THE GEOLOGICAL SOCIETY. 



Bellcr()])hon bilobatiis, ***. Orthooeras . 



■ acutus, *** (not carinatus). No Trinucleus found ; hut fragraen ts 



i,ii\cn.tmus, Emmonsl (Appen- of loose grey shale in the Onny, 



dix). This is also found in Ty- most probaljly from this locality, 



rone. have them in abundance. 



5. Trinucleus shales. — Above the grey calcareous shales last-meii- 

 tioned occur, both in the Onny River and further north, a series of 

 thin-bedded sandy shales of a yellow or yellow-brown colour. In the 

 Onny they are well seen in a low cliff on the left bank, about 300 yards 

 above the foot-bridge to Cheney-Longville, dipping eastward at an 

 angle of 20°, free from any admixture of calcareous beds, very uni- 

 form in character, and full of the Trinucleus to the very top. About 

 halfway along the cliff they are at once overlaid unconformably by 

 the calcareous and shaly beds of the ' Pentamerus limestone,' above 

 which no Trinuclei are found. In the fields at Batch Gutter above 

 mentioned, the same shales occur with Trinuclei and Orthides. In 

 the lane that leads from Marsh Farm to Acton Scott, they also occur 

 (with the same fossils) very near Henley, but they do not appear 

 farther north, being overlapped by the Pentamerus beds. The fossils 

 are — 



Trinucleus conceutricus, ****. Orthis elegantula. 



Clidophorus, same species as above. Leptsena sericca, small, ****, 



It is, we feel certain, fragments of this shale which have furnished 

 the Trinuclei mentioned by Prof. Sedgwick as occurring within the 

 limits of the Wenlock shale, and above the Pentamerus limestone*. 

 The boundary of the Wenlock shale in the first editions of the Survey 

 map was extended rather too far westward along this part of the 

 country, and was made to include this shale, now more correctly 

 referred to the uppermost part of the Llandeilo and Bala rocks. 



6. Coarse grits of Church Preen, Kinley, S,'c. — The lowest strata 

 of this overlying group are coarse grits and sandstones, hitherto 

 classed with the so-called Caradoc sandstones. They occur only at 

 the northern end of this district, and extend from the Wrekin nearly 

 as far south as Cardington, reposing on the successive divisions of 

 the beds before described, and are here overlapped by the lime- 

 stones and shales of the Pentamerus beds. At Gibbon's Coppice 

 and Morrell's Wood, they lie upon No. 1, the Cressage shales, and 

 are a coarse sandstone, very gritty in its upper part, and containing 

 a large species of Lingida very like L. crumena of the Malvern sand- 

 stones, but apparently distinct ; and in the same slabs with it Penta- 

 merus ohlonyus and Atrypa hemisphcerica, thus uniting it with the 

 overlying shales. This conglomerate is not continuous across the 

 Severn, for at Shiueton and Belswardins, on the opposite bank, the 

 shales and limestones are the lowest beds. But it reappears in 

 Cressage Park, where it is full of casts of Rhynconella decemplicata 

 and another sjjecies, both identical with those from the same beds at 

 jNIinton on the edge of the Longmynd. There are some very im- 

 perfect Orthides, which cannot be determined, in these grits at Kinley. 

 Here the beds rest on the Lower or Hoar Edge grits (No. 2). No 



* Quart. Geol. Jourii. vol. viii. p. 228. Prof. SecIgAvick agrees with us in this. 



