EXPLANATION OF THE PLATES AND WOODCUTS. 



PLATES XXIIL and XXIV., also XXV. to XXXVIII. 



Illustrate the memoir of Prof. Sedgwick and Mr. Murchison on the distribution and classifi- 

 cation of the Palaeozoic deposits of the north of Germany and Belgium : p. 221. 



Plate XXIIL 



Fig. 1. General succession of ancient rocks in the Rhenish provinces and Germany. 



Fig. 2. Section from the coal-field of Westphalia near Kettwig, to the carboniferous limestone 

 east of Ratingen : p. 228 et seq. 



Fig. 3. Section across the Devonian limestones at Schwelm, to show their dislocations and pass- 

 age into the inferior strata: p. 228 et seq., also p. 235 et seq. and p. 256 et seq. 



Fig. 4. Section from the greensand at Dortmund to the mountains south of Iserlohn, exhibiting 

 the succession from the coal-measures to the Silurian rocks. This section afibrded the 

 authors the correct order of formations in the Rhenish provinces. The beds (a) repre- 

 sent the ordinary coal-field ; [b] lower grits belonging to the same series ; (c) unproductive 

 coal-measures, equivalents of the culm-measures of Devonshire; (c?) the carboniferous 

 limestone occupying the same position as in Devonshire ; (e) shale and psammite, con- 

 stituting the uppermost strata of the Devonian system ; (/) Devonian hmestone ; (g) De- 

 vonian schist and shale; {h and i) SUurian greywacke: p. 228 et seq., likewise p. 256 

 et seq. 



Fig. 5. Section across the limestone strata of Paffrath, Gladbach and Bensberg, near Cologne, 

 exhibiting an inversion of the deposits. The black Hmestone (/) is identical in aspect 

 and fossils with that in figure 4, but the apparently overlying beds represent the lowest 

 limestones of the Eifel, which constitute a passage into the Silurian system : p. 24L 



Fig. 6. This section gives the general succession of strata near Dillenburg, the trap rocks being 

 omitted to preserve the true sequence of the stratified series of deposits. The prevalent 

 dip is to the S.S.E. : p. 244 et seq., also p. 253 et seq., and p. 256 et seq. 



Fig. 7. Actual transverse section across a portion of the country east of Dillenburg, to exhibit 

 the obscurity produced in the regular sequence of deposits (shown in section 6) by fre- 

 quent outbursts of trap and repeated alternations of schaalstein or a contemporary igneous 

 rock : p. 244 et seq. and p. 253 et seq., Hkewise p, 256 et seq. 



Fig. 8. Section from Herborn (south of Dillenburg) through Greifenstein to Daulbsen. The 

 strata near Herborn have been proved by their fossils to be supra-Devonian, and those at 

 Greifenstein are inferred to be upper Silurian, as they contain Pentamerus Knightii. 

 Great dislocations, not visible on the surface, are supposed to occur between Thalesbach 

 and Greifenstein : p. 244 et seq., also p. 256 et seq. 



Fig. 9. Section from the Devonian limestone at Limburg, on the Lahn, through the Taunus, 

 to Konigstein near Frankfort. It demonstrates that the sedimentary strata (greatly in- 

 verted) constitute only a crust of moderate thickness, resting on a mass of igneous pro- 

 ducts, which at many points have penetrated to the surface, and at others have altered 

 the incumbent rocks ; they Ukewise appear to be the origin of the various mineral waters 

 of Nassau : p. 244 et seq., also p. 280 et seq. 



Fig. 10. Relative positions of the Devonian and Silurian strata at Sotenich, in the district 

 of the Eifel: p. 267 et seq. 



