Vol. 69.] I'AIIADOXIDES PROM NEVE's CASTLE. 41) 



Parado.rkles bohemicus Bceek, var. scdopiensis, nor. (See p. 45.) 



Fig. 6. Cranidium, somewhat flattened [R.R. 2385]. 



7. Free cheek, referred with reserve to this species and variety [R.R. 



2435] 



8. Cranidium, somewhat flattened and crushed [R.R. 2485]. 



9. Fragmentary cranidium, less flattened [2415]. 



10. Dome of glabella, showing rugosities [R.R. 2429]. 



11. Dome of glabella and part of margin, showing rugosities [R.R. 2388]. 



12. Part of cranidium of larger individual, showing the posterior branch 



of the facial suture [R.R. 2416]. 



13. Part of one of the anterior (?) pleurae [R.R. 2423]. 



14. Complete pleura, from the posterior (?) part of the thorax [R.R. 2387]. 

 Figs. 15 & 16. Pygidia, seen from ab.-ve and from the side [R.R. 2382 & 2420]. 

 Fig. 16. Hypostoma and doublure [R.R. 2427]. 



Discussion on the two foregoing Papers. 



Mr. W. G. Fearnsides congratulated the Author on his palncouto- 

 logical discoveries, and on the close parallelism, which he had heen 

 able to prove between the Middle Cambrian rocks of Shropshire 

 and the Paradoxides-tessini Zone of Sweden. 



As bearing upon the mode of accumulation of the fossiliferous 

 breccias described, he drew attention to the following points : — 



(1) The fossiliferous matrix of the breccia contains glauconite. 



(2) The enclosed fragments of the Lower Cambrian rocks are quite 



unweathered ; they too iire glauconite-bearing, while the fissils 

 which they contain are preserved unaltered and consist largely of 

 calcite. 



(3) All the included fragments are markedly angular, and many of them 



have bounding-surl'aces which meet at acute angles. 



On this evidence the speaker would conclude that the erosion 

 which broke up the Lower Cambrian sandstone into fragments 

 took place in situ, and was not a subaecial but a submarine 

 process. He suggested that the Lower and Middle Cambrian rocks 

 of Shropshire, like the contemporaneous rocks of Northern (Eland, 

 are the record of a condition when sedimentation and submarine 

 erosion were nicely balanced ; when only trie larger fragments, 

 and the interstitial sand sheltered between them, remained unmoved 

 by the currents, and were preserved as sedimentary rock. The 

 occurrence of phosphatic nodules in beds interstratified with 

 glauconitic sandstones also pointed to the same conclusion. 



Mr. G. W. Lamplpgh remarked that marine sedimentation was 

 often a discontinuous proc< ss, and that gaps in a stratigraphical 

 sequence, even when accompanied by erosion, did not necessarily 

 imply elevation above s>a levtd. Amon^ the Mesozoic rocks it 

 was not unusual to find glauconitic and phosphatic deposits of 

 little thickness, which evidently represented long periods of arrested 

 sedimentation, and sometimes of submarine erosion. It was also 

 know 1 that the floors of our present seas were being scoured and 

 eroded in many places. 



Q. J . G. S. No. 27^. e 



