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Plate IX. A. Asymmetrical ripple-mark modified by waves, Avon 
river, N.S 73 
B. Plaster cast of ripple-mark of large amplitude, Kings- 
port, N. S 73 
X. A. Plaster cast of asymmetrical ripple-mark, Windsor, 
N.S 75 
B. Plaster cast of asymmetrical ripple-mark, Avon river, 
N. S 75 
XI. A. Plaster cast showing detail of asymmetrical ripple- 
mark, St. Lawrence river, at Lanoraie, Que 77 
B. Plaster cast of ripple-mark formed by river current, 
St. Lawrence river, at Lanoraie, Que 77 
XII. A. Asymmetrical ripple-mark of irregular pattern, Kings- 
port, N. S 79 
B. Ripple-mark interrupted by small boulders, Columbia 
river 79 
XIII. A. Irregular basin structure, Avon river, N.S 81 
B. Scalloped and terraced beds of sand, Avon river, N.S. 81 
XIV. A. Ripple- mark of irregular pattern, Annisquam, Mass . . 83 
B. Imbricated ripple- mark, Annisquam, Mass 83 
XV/ A. Current ripple-mark with fine cross ripples, Avon 
river, N. S 85 
B. Current ripple-mark with cross ripples developed 
further than in A, Avon river, N.S 85 
C. Current ripple-mark altered to rows of irregular knobs, 
Avon river, N. S. 85 
XVI. A. Plaster cast of miniature delta, Kingsport, N.S 87 
B. Plaster cast of current mark, middle ground bar, 
mouth of Avon river, N.S 87 
XVII. A, B, and C. Plaster casts of types of current mark 89 
XVIII. Surf on sandy beach, Lockeport, N. S 91 
XIX/ A. Plaster cast of wave-marks left by retiring waves, 
shore of lake Erie 93 
B, Plaster cast of imbricated wave sculpture, Port Col- 
borne, Oat t 93 
XX. A. Symmetrical ripple-mark, Wellington, Ont. 95 
B. Symmetrical ripple-mark, West lake, Wellington, Ont. 95 
XXI. A. Symmetrical ripple-mark, Aylmer, Que 97 
B. Plaster cast of symmetrical ripple-mark, Aylmer, Que. 97 
C. Plaster cast of symmetrical ripple-mark, near Welling- 
ton, Ont 97 
XXII. Plaster cast of interference ripple-mark, Lake Deschenes, 
Ont... 99 
