0. Holtedahl—A TiUite-Uke Conglomerate. 173 



Tillite-like conglomerate. Marginal upheaval (or central sink- 

 At least 10 m. ing) and very strong denudation of 



surrounding land, possibly by gla- 

 ciers. 

 Red, coarse, y o u n g e r Strong weathering and denudation of 

 sparagmite, often con- marginal lands, periodic flood trans- 

 glomeratic. 300-400 m. port of detrital material into central 



area. 

 Biri limestone. Quiet conditions; deposition of cal- 



About 100 m. careous material. 



Biri coarse c o n g 1 o m- Exceedingly strong denudation of 

 erate. 100-200 m. surrounding land, probably caused by 



important marginal uplift. 

 Lower red and green Slow sedimentation of argillaceous 

 shale, with beds of thin and calcareous material, 

 limestone. 

 Gray, older sparagmite. Strong weathering and denudation of 

 Several hundred me- marginal lands, periodic flood trans- 

 ters. port of detrital material into central 



area. 



Older sparagmite rocks known in more northern part of spar- 

 agmite area. 



Total maximum of Eocambrian sparagmites more than 2000 m. 

 Probably a lacustrine deposit on a low land bordering the sea. 



Erosion interval and unconformity. 



Intrusion of diabases into, and folding of, Jotnian Trysil sand- 

 stone. 



Trysil sandstone. 



Porphyry, granites, gneisses. 



Obituary. 



Dr. Alfred Goldsborough Mayor, for many years a Director 

 of the Carnegie Institution of Washington, died at the Tortugas, 

 Key "West, Florida, June 24, at the age of fifty-four years. He 

 was the son of Professor Alfred M. Mayer, the eminent physicist 

 of Lehigh University and later of the Stevens Institute of 

 Technology ; the results of many of Professor Mayer 's researches, 

 particularly in acoustics, have been published in this Journal. 



Dr. Mayor's early training was in the field of mechanical engi- 

 neering and, at the conclusion of his studies in this subject, he 

 received the degree of M.E. from Stevens Institute in 1889. 

 After graduation he became assistant in physics first at Clark 

 University and then at the University of Kansas. But after 

 three years of this work, he found his interest in the mathemati- 

 cal sciences was overshadowed by his intense love of natural his- 

 tory, and he therefore returned to the east and became associated 



