INDEX TO VOLUME 21 



Page 

 Ada MAN A, Arizona, Petrified log natural 



bridge near 323-325 



Adams, F. D, ; An experimental inves- 

 tigation into the flow of diabase . . 24, 



773 



— cited on nephelite syenite fields of 



eastern Ontario 91, 113 



— , First Vice-President, Presiding offi- 

 cer 1 



— , Presiding over annual dinner 27 



Aftonian beds. Composition and struc- 

 ture of 124 



, Description of fossiliferous sec- 

 tions 126-139 



of Iowa, List of species of mol- 



lusks found in 121 



— , Evidence that the fossiliferous sand 

 and gravel beds of Iowa and Ne- 

 braska are 31 



— fossils. Distribution of 125 



— fossiliferous beds, Stratigraphic rela- 



tion. Pleistocene section 125 



— mammalian fauna, Correlation with 



other deposits 120 



— , Importance of the 120 



— molluscan fauna. Significance of.... 121 

 faunas. Modern molluscan faunas 



compared with 122, 123 



— sands and gravels. Mammalian and 



molluscan remains in 120 



Agassiz (Lake), Birds Hill esker and 



glacial 408, 413, 415, 421-424 



AgassiZj Louis, Reference to glacial 



theory of 747 



Agassiz, Mrs. Louis, quoted on ant 



structures 473 



Ainslie, Archibald, Reports of obser- 

 vations of J. C. Gwillim by 369 



Alaska and British Columbia, Subalka- 



line coast range batholith of 90 



— •, Average elevation of mountain up- 

 lands in 720 



— earthquake of 1899, Observers of... 345 



, Seismologists observing . . . 346 



— , Glaciation in the uplands of the 



Coast range, southeastern 725 



— -, Height of Chugach mountains and 



Saint Elias range 343 



— , Installation of magnetograph and 



seismograph at Sitka 400 



— , Map of harbor of Yakutat village . . 363 

 — , Map showing minimum area of 



shocks felt, September 3, 1899, 



earthquake 347 



minimum area of shocks felt, 



September 10, 1899, earthquake... 357 

 relation of mountain axes to 



earthquake origin in Yakutat bay. 343 



— , Occurrence of epicenters in 397 



— , The mountain knot of figure 3, 



showing 203 



Alaskan earthquake of 1899, Area dis- 

 turbed by 395, 396 



, Date of greatest faulting of 



341, 342 



, Duration of 341 



; Lawrence Martin . . 23, 339-406 



, List of known observers 



and localities of 348,355,357,358 



LV— Bull. Geol. Soc. Am., Vol. 21, 1909 



Page 



Alaskan earthquake of 1899, Location 



and date of known 307-403 



of area of 343 



, Observations and descrip- 

 tions of 346-355, 356, 357, 359, 373 



, Other great earthquakes 



compared with 403-405 



-, Results of 341 



, Relation to other Alaskan 



earthquakes 397-403 



, Seismograph records and 



studies by seismologists 374-383 



, Time records of 388-391 



, Topography and geology of 



Yakutat region. Origin of 344 



— glaciers, Oscillations of 20, 758 



Alden, W. C, cited beaches around 



head of Lake Michigan 238 



— elected Fellow 3 



— ; Pleistocene phenomena of central 



Massachusetts 31 



Aleutian islands and Bering sea, Map 



showing habitual epicenters in ... . 397 



, The arc of the 199-200 



Algonkian system of the Wasatch re- 

 gion 535 



Algonquin and Iroquois beaches, Iso- 



bases of the 21, 227-248, 761 



, Relative ages of 241 



lakes. Map of, figure 1 230 



planes. Table for comparison 



of tilt rates of 244 



— • beach, Altitudes in the region of 



horizontality 286, 237 



, Altitudes of 100 localities of the 



231-233 



, Stage recorded by the 329 



, Tilt rates of the 234,235 



— lake. Map of, figure 2 230 



— plane, Isobases of the upwarped por- 



tion 231 



(The) as a datum plane 240 



— water-plane 229-241 



Alkaline and subalkaline eruptives 



and calcareous sediments, Table 



showing field associations 92-107 



rocks, Association of 89, 90 



— igneous rocks at Cuttingsville, Ver- 



mont, The complex of (extem- 

 pore) ; J. W. Bggleston 32, 785 



— rocks. Association of limestones, 



dolomites, and other calcareous 

 sediments with 91 



, Definition of 87 



, General statement of the inves- 

 tigation of 88, 89 



genetically connected with subal- 

 kaline magmas 90 



.Origin of the; Reginald a Daly. 32, 



87-118 



— Plutonic mass. Areas of 90 



Allen, E. T., Reference to accurate 



measurements of chemically pure 



pyrrhotite by 148 



— • ; Diposide and its relation to cal- 

 cium and magnesium metasilli- 

 cates, Reference to 166 



— ; The role of water in tremolite and 



certain other minerals, Reference to 166 



(797) 



