Association of American Geologists and Naturalists. 141 



the interval which has since elapsed, a copious mass of publications has 

 appeared, enlarging prodigiously our acquaintance with the exact geo- 

 graphical distribution of our strata, with their relationship to each other, 

 and to the rocks of Europe, and with their organic remains, and their 

 other contents. Many of these embody the results of years of previ- 

 ous systematic research, prosecuted in obedience to legislative enact- 

 ment in several of our states, while others are the fruits of individual 

 investigations, conducted by members of our Association, and others 

 again, the contributions of distinguished foreign geologists, liberally as- 

 sisted with materials by our own explorers. 



These publications consist chiefly of the printed volume of Transac- 

 tions of this Society, published about a year ago, the five large quarto 

 volumes on the Geology and Mineralogy of the state of New York is- 

 sued by that state at intervals during the last two years ; also the first 



eport on the Geological Survey of Connecticut, and those papers read 

 at our last annual meeting, which have appeared in the American Jour- 

 nal of Seience and Arts, together with memoirs submitted to the Geo- 

 logical Society of London, by Owen, Lyell and Logan. 



y these reports and memoirs, our knowledge has been greatly en- 



s m relation to almost every class of our rocks and every period in 



r geological chronology. Respecting the primary crystalline masses, 

 We ve re ceived most valuable additions to the details previously in 

 Pnnt, through the minute description of Connecticut by Dr. Pcrcival, the 

 "Cresting and instructive account of the district between the St. Law- 



ace and Lake Champlain, by Prof. Emmons, and that of the southern 

 counties of N ew Yor k by Prof. Mather. We have also been presented 



* an '^resting article on Tin veins in New Hampshire by Dr. C. T. 



Jackson. 



deeming the Paleozoic strata of the United States, the publications 



e een of an interest commensurate with the magnitude and gran- 



of h mrma »ons. Besides the accounts already given of the range 



ese rocks in New England j principally by Hitchcock and Jackson : 

 wd ° r0Ugh and minute analysis of these as developed throughout the 



andV^ ° f NeW Y ° rk ' ha ^ been furnishcd by Emmons ' Hal1 ' Mather 

 anuxem in their respective reports on the survey of that state. 



w J ' cntlt y of some of the western strata with those of New York, is 

 Set ror th in a memoir by Mr. Hall published in our volume of 



nS * ctlons ' while a valuable contribution has been made to the gcol- 

 t " ° tlle western states, by Dr. Owen in a paper on that subject, read 



e Geological Society of London. The extension of some of the 



a 



