28 PROCEEDINGS OF THE ANN ARROR ^rEETING 



VM[K Sources and tendencies in American geology. Science Montldy. volume 

 S, pages 193-206. 

 The place of modern languages in research, particularly in geological 



research. Science Monthly, pages 481-495. 

 The nature and bearings of isostasy. American Journal of Science (4), 



volume 48, pages 281-290. 

 Status of the theory of isostasy. American Journal of Science, pages 

 291 -.TIS, 



^osTH^■^[o^s Manuscripts 



1914, Rehitions of subjacent ignemis invasions to regional metamorphism. 

 Edited by Frank S. Grout. January-March, 1921. American Journal 

 of Science, series 5. volume 1, pages 1-19, 174-186. 255-267. 

 Piedmont terraces of the northern Appalachians. Edited by H. H. 

 Robinson, 1920. American Journal of Science, volume 49, pages 227- 

 258. 327-362, 407-428. 



THE WORK OK JOSEPH BARRELL ON PROBLEMS IN SEDIMENTATION^ 



r.Y THOMAS WAYI.AM) VAlCiHAX" 



(t).\ TENTS 



Page 



Problems in sedimentation considered by Barrell 2n 



Tiarrell's investigations of the principles of sedimentation .n 



(ieneral observations on BarreU's work .'Jl 



The relief factor in deposition :Il' 



The climatic factor in deposition :U 



Restoration of the former limits of greatly eroded formations :;6 



The significance of some special features of sediments :{i) 



The interjiretation of particular geologic formations :;s 



Rhythms and the measurements of geologic time 41 



Conclusion 44 



PUOBLK.MS IN SkDIMENTATION CONSIDERED BY BaRRELL 



The lu'st way (luickly to gain a correct idea of tliat part of tlie tield of 

 sedimentation in tlie study of which Barrell was active is to give the fol- 

 lowing list of his papers on the subject:^ 



190(>. Relative gt'ologieal imi)ortance of continental, littoral, and marine sedi- 

 mentation. Journal of Geology, volume 14. pages 316-356. 4:i0-457. 

 524-56S. 



P.>(>7. Review of "Manual of the geology of Connecticut." by W. N. Rice and 

 H. K. Gregory. American Journal of Science, fourth series, volume 

 23. pages 3S5-392. 



' Mauusciipt lecoived by the Secretary of the Society November 8. livjj. 

 - I'ubMshed by permission of the Director of the L". S. Geological Survey. 

 "Taken from list by I'harles Scbuehert. Am. .Ttnir. Sri. (4t.vol. 4N, I'.tp.t. pi>. i*7T-Js(». 



