1881.] ^-'l 



Along Galisteo creek, ia central New Mexico, as well as on the Rio 

 Grande, 100 miles further south, the writer has sought in vain for speci- 

 mens of the Halymenites, both in 1879 and 1881. The fucoid seems to 

 be wholly wanting in the Laramie area of central New Mexico. 



Comparing the distribution at the several localities mentioned, we have 

 as the vertical extent of the fucoid : 



In northern Colorado, along South Platte 700'-{- 



In central Colorado, Canon City field 400' 



In southern Colo, and northern N. M., Trinidad field. 80' 

 In central New Mexico, Galisteo creek and Eio Grande. 0' 



Halymenites major, along the eastern foot of the Rocky mountains, is as 

 thoroughly diagnostic of the Fox Hills group a Arthrophycus Tiarlani is of 

 the Medina sandstone in the Appalachian region. The Halymenites 

 sandstone of the Trinidad field, the lower 400 feet of the Canon City 

 column, and the enormous mass of sandstone on the South Platte, below 

 St. Train's creek, are equivalent and represent the Fox Hills group, as gen- 

 erally accepted. Coal occurs in them all, but most abundantly in the 

 Canon City area. It should not be forgotten, however, that the South 

 Platte locality is at 70 miles from the mountains. When the section has 

 been made from the mountains to that locality, not a little of the produc- 

 tive coal series will be found represented on the Platte by this sandstone 

 group. 



The Fox Hills group, as generally accepted, thins out southward and 

 finally disappears before reaching central New Mexico. 



Stated Meeting, October 21, 1881. 



Present, 15 members. 



President, Frederice Fraley, in tlie Chair. 



Mr. Aubrey H. Smith, presented his photograph for the 

 album. 



Letters ot enroy were received from the Second Geological 

 Survey of Pennsylvania, the Johns Hopkins University, and 

 the Geological Survey of the United States. 



Donations to the Library were received from the Gazette 

 Hongroise ; J. M. Schary's heirs, Prag ; Royal Institute, 

 Venice ; Revue Politique ; Royal Academy, Brussels ; Nature ; 

 Essex Institute; S. H, Scudder; Board of Education, Provi- 

 dence, R. I. ; Wesleyan University ; Silliman's Journal ; New 

 York Academy of Science ; Franklin Institute ; Medical Jour- 



