VI Co)t tents. 
Recent Contributions to our Knowledge of tlie Cladodont 
Sharks. E. W. Claypole 363 
Camptonite dikes near Danbj'borough. V't. Veknon F. 
Marsters 368 
Auriferous Gravels of the Sierra Nevada. H. W. Turner 371 
Editorial Coviment.— The Deep Shaft at Livonia, N. Y., 379.— The 
Earth's Age, 382. 
Review of Recent Geological Literature. — The Geology of Minnesota, 
vol. III. pt I, of the Final Report, Paleontology, N. H. Winch- 
klIj, State Geologist, 384. — The Geology of Conanicut Island, G. 
L. Collie, 386.— The Geomorphogeny of the Coast of Northern 
California, Andrew C. Lawson, 387. — Annals of British Geology, 
1898, J. F. Blake, 387. — Results of a Transcontinental Series of 
Gravity measurements, G. R. Putnam, 388. — Notes on Gravity 
Determinations Reported by Mr. G. R. Putnam, G. K. Gilbert, 
388. 
Recent Publications, 389. 
Correspondence. — A Correction, F. B. Taylor, 391. — A Question of 
Priorty, W. F. Cummins, 395. —Stages of Recession of the North 
American Ice-Sheet shown by Glacial Lakep, Warren Upham, 
396. 
Personal and Scientific News, 399. 
Index to Volume XV, 101. 
