INDEX TO VOLUME 21 



809 



Page 

 HusSAKOF and E. R. Cummings ; Pale- 

 ontologic evidences of recapitula- 

 tion 74 



Hustedia mormoni, Fossils of Wasatch 



region 530 



Hyatella congesta beds, Anticosti island 709 



Ice as an erosive agent 



— erosion, Cycle of 



— cap beveling, Characteristics of 



erosion, Features of 723 



in Iceland, Present extent of.... 



. , Remnants of 



— flood period. Characteristics of 



, E. C. Andrews and others, 



named by 



, Figures showing sections of . . 



Iceland, Alteration of land surface 

 since ice recession in 



— , Area of lowland coastal strips of . . . 



— , Basalt formation bedrock in north. . 



— , Condition during the Glacial epoch 

 in 



— , Elevation and composition of 



— , Features of valley glacier erosion in. 



719- 



— , Glacial action in New Zealand and 

 Alaska compared with that in ... . 



— , Glaciers and volcanoes dominant 

 geological features of 



— , Groups of mountain glaciation in . . . 



— , Habitation in and barrenness of ... . 



— , Names of master valleys in north . . 



— , Obsidian from Hraf ntinnuhryggur . . 



32, 



— , Signs of glaciation in the upland 

 surface of northern 



— , Some effects of glacier action in ... . 



20, 717- 



— , Soundings by the Danish govern- 

 ment in 



— , Summary of effects of glacial action 

 in 



— , The upland surface in 



— , Thickness of formation in north .... 



Ice-sheet beveling, The field problem of 



ICKES, E. L. ; Contribution to the 

 geology of eastern Oregon. (Ab- 

 stract.) 



IDDINGS, J. P., cited in discussion of 

 alkaline rocks 



— .Igneous rocks, 1909, Reference to.. 



— , Photograph of Yellowstone natural 

 bridge by 



Igneous rocks. Division of, into Atlantic 

 and Pacific branches not warranted 



, L. V. Pirsson cited on 



, The complex of alkaline 32, 



Indiana, Natural bridge at Attica 



Interglacial period,' Climatic condi- 

 tions during Af tonian 



Iowa and Nebraska sand and gravel 

 beds. Evidence fossiliferous, are 

 Af tonian 



— , Natural bridges of Jackson county . . 



— Lakeside laboratory, Location of . . . . 

 Ireland, Formation of dimes of Galway 

 Iroquois and Algonquin beaches, Iso- 



bases of the 21, 227-248, 



, Relative ages of 



planes, Table for comparison 



of tilt rates of 



— plane. Measurements of 242, 



— (The) water-plane 



Irving, R. D., cited on sand grains 



from the Huronian, Potsdam, and 

 Saint Peter formations of Minne- 

 sota, Wisconsin, and Michigan .... 



719 

 736 



723 

 ■730 

 718 

 718 

 720 



718 

 724 



718 

 717 



718 



718 

 717 



723 



720 



717 



718 

 717 



720 



784 

 724 

 730 



718 



727 

 724 

 718 



727 



791 



88 

 152 



323 



114 

 109 



785 

 317 



120 



31 



332 

 122 

 647 



761 

 241 



244 

 '.'43 

 241 



G49 



Page 

 Ischyromyd^, Osteology and relation- 

 ship of parmys and the affinities 



of the 74 



"IsoBASES for zero," Term used by De 



Geer 239 



IsoBASES and the pre-Cambrian bound- 

 ary 245-247 



— of the Algonquin and Iroquois 



beaches and their significance ; 



James Walter Goldthwait 21, 



227-248, 761 



Iroquois plane' 242 



IsoBASic map of the Algonquin and 



Iroquois beaches, plate 5 233 



Isolation in paleontology ; John M. 



Clarke 74 



ISOSTACY, Theory of; W. M. Davis. 25,777 

 Ithaca, New York, Geological Society 



of America organized at 746 



Jackson county, Iowa, Natural bridges 



of 332 



Jackson, Robert T., and D. P. Pen- 

 hallow ; Phylogeny and Paleon- 

 tology 74 



Jaggar, T. a., Jr., Discussion on Ha- 

 waiian volcanoes by 22 



— ; Genetic classification of active vol- 

 canoes. (Abstract.) 23, 768 



— ; Tarumai, a cumulo-volcanic erup- 

 tion in Japan, 1909 23, 768 



Japan, Tarumai, a cumulo-volcanic 



eruption in 1909 in 23, 768 



Jefferson county. New York, Natural 



bridges of 332 



Jefferson, M. S. W. ; Beach cusps... 26 



— cited on beach cusps 601, 603 



— ; Meanders and scallops 26 



— , Reference to paper on "Shore phe- 

 nomena on lake Huron" of 602 



— , Reference to paper "On the lake 



shore" of 603 



— ; Theory of formation of beach 



cusps 616 



Jeffrey, E. C. ; Microscopic study of 

 certain coals in relation to the 

 sapropelic hypothesis. (Abstract.) 



33, 788 



Jensen, H. J., Known facts of origin 

 of alkaline rocks, disagreeing with 

 hypothesis of 118 



Jessup, J. M., Reference to work in 



Wasatch mountains 517 



Johnson, D. W. ; Beach cusps 27, 



599-624 



— ; Discussion on post-Tertiary history 



of the lakes of Asia Minor and 

 Syria by 20, 756 



rock streams of Veta moun- 

 tain 26, 764 



— , Reference to paper on "The origin 



of beach cusps" of 603 



Johnson, Willard D. ; Recent fault- 

 ing in OAvens valley, California. 

 (Abstract.) 792 



Jornada del Muerto, JS[ew Mexico, Car- 

 bonic limestone formation in 560 



Jupiter River formation, Anticosti 



island 713 



, Fossils of 713-715 



— — — , Location, composition, and 



thickness of 713-715 



— , Zones and fauna of 713-715 



Kalm, Peter, cited on height of Ni- 

 agara falls before separation 443 



Kame and Esker deposits, Birds Hill 



vicinity 424-427 



Kangerdluarsuk (Greenland), Area of 



nephelite syenite of 80 



