. Bulletin of the British Museum (Natural History), Geology. 70 PTERASPIS LEATHENSIS WHITE, A DITTONIAN ZONE-FOSSIL Outside the Anglo-Welsh area closely related species have been found in north France and Spitsbergen, in the former the resemblance being so close as to suggest possible identity when the French fossils are better known. •:iii;-: Pteraspis crouchi Pteraspis leathensis Traquairaspis symondsi Traquairaspis pococki iPsammosteus i Limestone Cephalaspis Sandstone-cornstones Dittonian Sandstones and Cornstones with Cephalaspids Text-fig. i. Diagrammatic representation of the class
. Bulletin of the British Museum (Natural History), Geology. 70 PTERASPIS LEATHENSIS WHITE, A DITTONIAN ZONE-FOSSIL Outside the Anglo-Welsh area closely related species have been found in north France and Spitsbergen, in the former the resemblance being so close as to suggest possible identity when the French fossils are better known. •:iii;-: Pteraspis crouchi Pteraspis leathensis Traquairaspis symondsi Traquairaspis pococki iPsammosteus i Limestone Cephalaspis Sandstone-cornstones Dittonian Sandstones and Cornstones with Cephalaspids Text-fig. i. Diagrammatic representation of the classification of the Dittonian and upper Downtonian strata of the Anglo-Welsh region used in this work (A) compared with that of Wickham King, 1934, (B) to show the diachronic nature of the ' Psammosteus Lime- stones' and the general distribution of sandstones and cornstones with Cephalaspids for comparison with the supposed ' Cephalaspis Sandstone-Cornstones' of King. II. THE LOCALITIES AND ASSOCIATED FOSSILS I. Leath i {or Leath Stream), Corvedale, Salop. 'Leath Stream (i) is a rivulet on N. side of the road at Leath Bank, the steep hill on road from Ditton Priors to Holdgate and Stanton Long. There is one cottage on the side of this road at Leath Bank and the section (in rivulet) is a little to E. of this cottage. This is L 8 but it is high up in this stage as the hard band (in L 8 base at Earnstrey [slightly less than a mile away to the SW.]) crosses Leath Bank below and W. of the cottage and its garden on that bank—all specimens [from] Leath Stream (i) I. 8 are out of this rivulet E. of this cottage.' (W. W. King in Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). London : BM(NH)
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