188 THE GEOLOGY OF THE ENGLISH CHANNEL. 



h. A "Potato Stone," })artially coated with marl and filled with pinkish calcite. 

 The inside of the shell was studded with small brilliant pyramids of quartz. 



c. Grey sandstone. 



d. A nodule of Triassic Trap. A hard red rock, slightly micaceous ; very 

 closely resembles some varieties of the Triassic Trap of Thorverton, with 

 affinities to those of Pocombe and Cawsand. 



W. 6. S. by W. Deadman, 20 miles. 



a. A light salmon-tinted drab calcareous sandstone, in a slab nearly two feet 

 in longest diameter, the under surface intact and slightly pitted. 

 h. Granitic and granitoid pebbles. 



c. Quartzite pebbles. 



d. Flints. 



W. 7. S. Deadman, 7 miles. ^ 



Slabs of Triassic conglomerate, evidently torn from a submarine reef-point, 

 sides, and upper and lower surfaces being intact in each instance, and the only 

 broken surface that of fracture from the parent rock. Examined micro- 

 scopically this conglomerate proves to contain pebbles of slate, grits, vein 

 quartz, quartz-felsite, and andesite. 

 W. 8. S.E. Deadman, 3 miles. 

 W. 9. W. Deadman 4 miles, 

 W. 10. S.W. Deadman, 10 and 12 miles. 

 W. 11. S. by E. Deadman, 27 miles. 

 No Trias found at any of the last four positions. 

 W. 12. S.W. Falmouth, 10 miles. 

 Ochreous volcanic ash. 



^ "Additional Notes on the Cornish Trias," Trans. Royal Cornwall Geological Society, 

 1891. 



EXPLANATION OF PLATES. 

 Plate VL (0pp. p. 123). (1). Micro-pegmatite, with characteristic intergrowth of felspar 



and quartz. (2). Central portion of (1), more highly magnified. 

 ,, Vn. (0pp. p. 135). (1). Hornblende-gneiss. ShoAving 3 garnets ; immediately 



beneath the central one a small, uniformly tinted area of chlorite. (2). 



Chlorite schist with crushed plagioclase felspar. 

 ,, VIIL (0pp. p. 143). Grit, with derived fragment of older rock (A-B). 

 ,, IX. (0pp. p. 151). (1). Hard yellow chalk, with derived inclusion of earlier 



chalk rock. (2). Section of same, showing foraminifera, shell fragments 



and other organic remains. 

 ,, X. (0pp. p. 153). Decomposed black flint, with shell fragments and complete 



foraminifera in carbonate of lime. (2). Lower part with carbonate of 



lime removed. 

 ,, XI. (0pp. p. 156). Eocene limestone. 



,, XII. (0pp. p. 157). Eocene limestone, showing foraminifera. 

 ,, XIII. (0pp. p. 163). Chart, Start to Hand Deeps. Illustrating Dr. Allen's Start- 



Eddystone dredgings. 

 ,, XIV. (0pp. p. 166). Chart showing distribution of granite and gneiss. 

 ,, XV. (0pp. p. 168). ,, .! >> trias, rhaetic, and lias. 



,, XVI. (0pp. p. 169). ,, ,, ,, hard yellow chalk. 



,, XVII. (0pp. p. 179). ,, ,, location of dredgings recorded by Mr. A. R. 



Hunt and ]\Ir. R. N. Worth. 



