17 
east, the mining district of Shelve on the south, and the 
most distant Welsh mountains, including Cader Idris, on 
the north west. After a careful search, no fossils were 
found either in Marrington Dingle or the Cornden, until 
the more fossiliferous Llandeilo flags were reached at 
Rorrington and Mincop, but many interesting sections of 
lower Silurian strata were exposed, in conjunction with 
volcanic rocks, so common in this district. At Rorrington 
and Mincop, Ogygia Selwini, Lingula, and other 
characteristic fossils were found. After a long walk of 
sixteen miles, the party reached Worthen, their head 
quarters, about 7.30. 
On Wednesday they were joined by the Revd. J. La 
Touche, and walked to Shelve, vid Brownlow, by Shelve 
Church to Ritton Castle and the Stiper stones. A few 
fossils were obtained in the black lower Llandeilo shales 
at Ritton, including an entire ‘ Illenus perovalis.’ The 
stiper stones consist of sandstone of lowest Silurian age, 
much altered by heat by adjacent igneous action, and 
contain rare but occasional traces of animal life of the 
earliest period. The igneous or ‘trap rocks’ of the Corn- 
den hill throw off lower Silurian strata of the Llandeilo 
formation, which throughout the whole of this district are 
‘more or less effected by and brought into contact with 
igneous rocks. Shelve is also celebrated as a mining 
district, many lead veins occurring in the Llandeilo 
formation. The whole of this country is of special interest, 
because it represents, on a smaller scale, the grander 
development of the same rocks throughout a large portion 
of Wales. 
- The homeward journey was made by the Gravel’s Mine, 
-across the pretty Hope Valley to Worthen. On Thursday, 
