100 



BRITISH FOSSIL CRUSTACEA. 



naspis grits, twenty feet), with Auchenaspis Salteri, Pterygotus, Cep/ialaspis (two species), 

 and Lingula. These strata pass conformably into red marly beds with white and reddish 

 sandstones which yielded fragments of Pterygotus, also remains of a Pteraspis now in 

 Lord Enniskillen's collection, and a Cepkalaspis. 



Fig. 29. — Section at the Railway Tunnel, near Ledbury, Herefordshire. 1 



W. 



O o 

 3 09 

 a p 



o 



*t) 



g bk 



^ ct, 



M 



■* 



^O 



■a 







<§' "« 



„ 3 



<b 



S* 





** 



^3 a- 



S "> 



-S 





a 





s S 



3 V 



a 



*S 3 



(? 



"3 



it 



» S - 



3 3 



>s 



"3 S 



•8 



Ss' 



6o' 





CO 



s- 3 



19 20 21 22 23 24 25 2G 27 



1 to 4 



6 to 14 



15 to 18 



Explanation of Section. 



Marl with some bands of sandstone. 



Grey rock. 



Marl. 



Grey rock. 



Marl. 



Grey rock. 



Marly rock with Cepkalaspis. 



Grey rock. 



Marly rock. 



Grey rock. 



Marly rock with Pteraspis, some of the hard bands 



finely laminated. 

 Grey rock. 

 Marl. 



Grey rock. 

 Marl. 



I Red and blue marls. 



! Yellowish-grev sandstone, 18 inches. 



16. Grey marl and ! .,,,'„., 



■! Greenish shale, 6 inches. 

 Grey rock. I , , 



I Dark grey sandstone, 8 inches. 



L Deep red micaceous shale. 



17. Purple sandstone. 



18. Purple marls and shales. 



19. Grey shale. 



20. Red marl. 



21. Red sandstone. 



22. Red marl with Pteraspis. 



23. Mottled marls. 



24. Red marls with grey spots. 



25. Downton sandstone with red, grey, and yellow marls. 



26. Upper Ludlow rocks, about 140 feet. 



27. Aymestry rocks, about 10 feet thick. 



9. — The Passage-beds of the Wooliiope District. 



These strata have been well described quite recently by my friend the Rev. P. B. 

 Brodie, in the ' Quart. Journ. Geol. Soc./ Aug. 1, 1871. The sections nevertheless are 

 poor compared with that at Ledbury ; and the only one of them worth consideration is that at 

 Perton, where we see only 16 feet 11 inches of rock in stratigraphical succession. Mr. Brodie, 



1 This section was given to illustrate my paper in 'Quart. Journ. Geol. Soc.,' 1860, vol. xvi, 

 p. 194 ; but unfortunately the engraver did not reverse the drawing, so that the engraving is there 

 reversed. See also 'Quart. Journ. Geol. Soc.,' vol. xvii, p. 154. 



