Feet. 



Inches. 



12 







2 







2 







2 











6 



4 











1 



LOCALITIES IN " SILURIA." 95 



Mr. Hugh Strickland read a paper 1 before the Geological Society in June, 1852, on the 

 occurrence at Hagley, four miles north-east of Hereford, of the Ludlow Bone-bed, " a 

 stratum interesting, not only for its wide extension, as contrasted with its very slight 

 vertical thickness, but also as presenting nearly, if not quite, the earliest known indication 

 of vertebrate life on the surface of our planet." 2 The writer of these notes accompanied 

 Mr. Strickland and Mr. Scobie on the original discovery of this protruded mass of Upper 

 Ludlow rock, which is in close proximity to a trap-dyke at Bartestree, there seen 

 to traverse and alter the Lower Old Red Sandstone. The following is the section, taken 

 from our measurements made on the spot : 



Old Red Sandstone. — Red clays and marls 



Brownish beds ..... 



Flaggy beds, micaceous .... 

 Downton Beds. — Yellowish sandstones, with carbonized Plants 



Clay. ..... 



Micaceous yellow beds, with Plants . 

 Bone-bed, with teeth and spines of Fish, and Pterygotus 

 Upper Ludlow Beds. — Numerous fossils and Pterygotus claw, in the 



Strickland Collection at Jardine Hall . . .40 



The chelse of a Pterygotus were afterwards discovered by Mr. Scobie in the Upper 

 Ludlow rock at Hagley, and forwarded by him to London, where it was examined by 

 Mr. Salter, and described by him 3 as being especially interesting, and exhibiting the limbs 

 of a Silurian fossil not hitherto discovered. These he connected satisfactorily with the 

 species so fully figured by Agassiz, which was obtained from the basement beds of the Old 

 Red Sandstone of Forfarshire. 



On the same slab with it are specimens of Orthis lunata and Orbicula rugata, fossils 

 of the Upper Ludlow Rock, and not found in the higher, yellow, Downton Sandstones. 

 This Pterygotus claw is in the cabinet of Mrs. Hugh Strickland, at Jardine Hall, Dum- 

 friesshire, and is figured, ' Quart. Journ. Geol. Soc.,' vol. viii, pi. xxi, under the name of 

 Pterygotus problematicus. The pit at Hagley, though still open, has not been worked for 

 some years ; but I well remember having seen fragments of the carapace of Pterygotus in 

 the yellow Downton Sandstones which overlie the "Bone-bed." The "Bone-bed," too, 

 of Hagley Quarry is especially rich in Crustacean and Ichthyic remains. 



The line of junction between the Passage-rocks of the Old Red Sandstone with the 

 Upper Ludlow rocks strikes in a north-east direction from the Painscastle Hills to Kington, 

 and thence flanks the hills which run by Shobdon and Richards Castle to Ludlow. The 

 Upper Ludlow rock is seen well filled with fossils along Hergest Ridge, and thence by 

 Gladestry to Painscastle, where it is overlain by ridges of the lowest Old Red Sandstone. 



1 ' Quart. Journ. Geol. Soc.,' vol. viii, p. 381. 



2 Op. cit., vol. ix, p. 8. 3 Op. cit., vol. viii, p. 386. 



n 



