Association of American Geologists and Naturalists. 107 



Doctor H. King came to the conclusion, from observations 

 made in Missouri and elsewhere in the west, that no volcanic or 

 igneous agency had any influence in the segregation of the lead ; 

 the subjacent beds had no dykes, dislocations, or other proofs of 

 igneous agency. The lead was imbedded in the rock, like masses 

 of chert ; had not been volatilized, and it not unfrequently was 

 the matrix of fossils. Further, the chief deposits are arranged 

 in great eastern and western lines, occasionally in plates filling 

 cracks in the rocks. 



The oral discussion of the subject was continued until the 

 hour of adjournment. 



Friday morning, May 10. — The Association met at 9 o'clock 

 in the Unitarian church. Dr. Locke took the chair, and present- 

 ed to the notice of the Association, from Mr. John Vancleve, of 

 Dayton, Ohio, a translation of the first part of Dr. Goldfuss's 

 work on •' Petrifactions," part " Zoophytes." 



Prof. Hitchcock gave, by request, an oral recapitulation of the 

 points of his paper of yesterday on Trap Tufa, &c. previous to 

 the reading of Mr. Silliman's paper on the Trap and Sandstone 

 of Connecticut. 



A letter of Messrs. Booth and Boye, of Philadelphia, in refer- 

 ence to the "Report on the native compounds of Lime, Magne- 

 sia, Manganese, and Iron," expected from them, was read, and 

 it was voted that they be requested to report on the same subject 

 next year. 



Mr. B. Silliman, Jr. presented a "Report on the Intrusive 

 Trap «f the New Red Sandstone of Connecticut," which was_ 

 called forth by a resolution of the Association last year, and 

 was confined chiefly to several theoretical considerations, found- 

 ed on the facts developed by Dr. Percival's able Report on the 

 Geology of Connecticut, and orv others of his own observation. 

 The conclusions arrived at by Mr. Silliman, after a full discus- 

 sion of the subject, which occupied more than an hour, were — 



First. — That the sedimentary strata of the valley of the Connecticut 

 were laid down from suspension in water in the angular position in 

 which we now find them, (with an easterly dip,) and have suffered no 

 subsequent change of dip, except in immediate connexion with and de- 

 pendent on the injection of the trap rocks ; and further, it was considered 

 probable that these strata were deposited by a primeval oceanic current, 

 setting from the southwest and west, bearing with it the ruins of the pri- 

 mary strata over which it flowed. 



