D. Jones — On the Carboniferous Deposits of Shropshire. 363 



EXPLANATION OF PLATE X. 



Fig. L — Outline map of Lake of Como, with tlie names of the places between which 

 transverse sections have been taken. The numbers inserted show the maximum 

 depth in yards of the Lake at each transverse section. 



Fig. 2. — Longitudinal section of the lake from Gera to Ponte, near Lecco, the 

 numbers affixed to the vertical dotted lines showing the maximum depth of the 

 Lake in yards at each point where a transverse section has been made, and the 

 numbers written parallel to the surfaces showing approximately the horizontal 

 distance in yards between one transverse section and the adjoining one. The vertical 

 distances showing the depth are exaggerated as compared with the horizontal 

 distances in the ratio of five to one. 



Fig. 3. — Longitudinal section of the Lake from Gera to Como, the numbers corre- 

 sponding to those in Fig. 2, and being identical so far as the portion between 

 Gera and the section from Menaggio to Varenna. 



Fig. 4. — Transverse section between Domaso and Monteccbio. The numbers written 

 horizontally denote approximately the distances in yards from the western or left 

 hand shore at which each sounding was taken, and the numbers written verti- 

 cally the corresponding depth in yards. In this and all the succeeding trans- 

 verse sections the vertical and horizontal distances are drawn to the same 

 scale. 



Fig. 5. — Transverse section between Castello di Musso and Olgiasca. 



Fig. 6. — Transverse section between Rexzonico and Dervio. 



Fig. 7. — Transverse section between Villa Eicordi and Bellagio. 



Fig. 8. — Transverse section between Argegno and Cavagnola. 



Fig. 9. — Transverse section between Torriggia and Como. 



Fig. 10. — Transverse section between Lucisino and Torno. 



Fig. 11. — ^Transverse section between Villa Capriccio and Geno. 



Fig. 12. — Transverse section between Villa Serbelloni and Fiumelatte, 



Fig. 13. — Transverse section between Bellagio and C. Cicogna. 



Fig. 14. — Transverse section from S. Anna to Mandello. 



IV.— On the Co-EEIiATION OF THE CARBONIFEROUS DEPOSITS OF 



CoRNBEooK, Brown Clee, Harcott, and Coalbrook-dale. 

 By Daniel Jones, F.G.S. 



IT has not hitherto been clearly made out in what way these 

 Carboniferous patches are related to each other. Some have 

 considered it doubtful whether the three former are in any way 

 represented in the Coalbrook-dale Field. The prevailing impression 

 is, I believe, that the Clee Hill Fields are quite distinct in point of 

 age from any of the Coal tracts surrounding them, and were formed 

 in a depression sufficiently low to receive the Millstone Grit which 

 we find to be wanting in the extensive Coal-fields to the East and 

 North-east, except, let me observe, along the Western margin of the 

 Coalbrook-dale district, where it is not well developed, but still repre- 

 sented. Eastward of that margin, however, it thins out rapidly, and 

 gives way to the Silurian flooring of that Coal-field. 

 I propose to show the following co-relations : — 



a. Between Cornbrook and Brown Clee Hill ; 



h. „ Cornbrook and Harcott ; 



c. „ Harcott and Coalbrook-dale ; 

 taking fijced horizons, and tracing the Coals and Ironstones within 

 them through the whole of these districts. 



That the Cornbrook basin was once connected with the Coal 

 patches on the Brown Clee seems to be accepted by most Geologists, 



