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BRITISH FOSSIL CRUSTACEA. 



naspis grits, twenty feet), with Auclienaspis Salteri, Pteryyotus, Ceplialaspis (two species), 

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

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

 Lord Enniskillen's collection, and a Cep/ialaspis. 



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



W. 



19 20 21 22 23 24 25 



26 27 



6 to 14 



15 to 18 



9. 

 10. 

 11, 



12. 

 13, 

 14, 

 15 



Marl with some bands of sandstone. 



Grey rock. 



Marl. 



Grey rock. 



Marl. 



Grey rock. 



Marly rock with Cephalaspis. 



Grey rock. 



Marly rock. 



Grey rock. 



Marly rock with Pteraspis, some of 



finely laminated. 

 Grey rock. 

 Marl. 

 Grey rock. 

 Marl. 



16. Grey marl and 

 Grey rock. 



Explanation of Section. 



f Red and blue marls. 



Yellowish-grey sandstone, 18 inches. 

 «i Greenish shale, 6 inches. 

 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, 

 the hard bands 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. Avmestry rocks, about 10 feet thick. 



9. — The Passage-beds. of the Woolhope 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. 



