17. Si/m-ian and Old Red i)i S. Staffordshire. 487 



Bone-beds and shales occur along the west side of the reservoir, and 

 here L. minmia occurs abundantly within a few inches of F''. 



We divide E and F where Z. cor^ma first occurs, though they 

 might be regarded as one gradual transition from Silurian to Old Red 

 Sandstone conditions. 



Miss Eiles and Miss Slater recorded two important palseontological 

 changes in the uppermost Silurian of the Ludlow district, and we find 

 the same at Saltwells. 



At Saltwells the two great breaks are at the Ludlow Bone-bed and 

 the Temeside Bone-beds. Below the former Brachiopoda abound, 

 whilst above it they are rare, except Lingulm. At and below the 

 calcareous yellow -green grits and two Tenieside Bone-bed limestones 

 there is ample palaeontological evidence ; whilst above them the strata 

 become thick purple or light-green or blue marls and highly micaceous 

 purple and light-green sandstones, in which it is difficult to find fossils. 

 We think we are justified, on these grounds, in regarding all the beds 

 at Saltwells between F* and the conglomerate at the base of the Coal- 

 measures as being Old Red Sandstone. 



^4. The Old Red Sandstone. — The Brewins Tunnel section continues 

 at the same dip and regular bedding as the Temeside Shales, 

 thus: — 



ft. in. 

 Purple marls with thin (2 in.) bands of micaceous purple 



sandstones . . . . . . . . . 12 



Hard purple sandstone . . . . . . . .10 



Eubbly bluish-green sandstone . . . . . .30 



Micaceous purple and bluish-green sandstone . . .40 



Micaceous bluish-green fissile sandstone underlying a con- 

 glomerate at the base of the Coal-measnres. We cannot 

 find any recognizable fossils in these beds . . ..20 



22 



Underlying the Coal-measure conglomerate, dipping west, that 

 crops out over 150 yards to the W.N.W. of the tunnel, there are 

 purple and green marls and sandstoTies in which a few obscure fossils 

 have been found by us. Mr. Lewis has located basaltic intrusions in 

 these beds which pass up into the Coal-measure Series. 



Some 25 yards east of Messrs. Doulton's engine-house is this upward 

 sequence, dipping S.S.E. 33°-40°— 



ft. in. 

 Yellowish-brown sandstones . . . . . . .30 



Ochre and bluish-red marls or clunch with (fish ?) scales and 



Onclius . . . . . . . . . .36 



Red beds, with decomposed basalt, underlying Coal-measure 



yellow grits . . . . . . . . .40 



10 6 



Mr. C. F. E. Griffiths kindly supplied to Mr. King details and 

 a specimen of a pebble-bed, largely composed of angular pieces of rock 

 similar to the above bluish-red marls, that was found 190 feet below 

 the Thick Coal, three-quarters of a mile to the S.S E. at Saltwells 

 Colliery No. 24, resting on 6 feet of binds. 



