1 882. 9 Tra7is. N. Y. Ac. Set. 



of Devonian age. The coal measures of Pennsylvania contain similar 

 Crustacea, many having recently been discovered at Darlington. 



October 23. 



SECTION OF GEOLOGY. 



The President, Dr. J. S. Newberry, in the Chair. 



Forty-two persons present. 



The resignation of Mr. Strang was accepted. 



The following specimens were exhibited : by Mr. G. F. Kunz, 

 white pyroxene, found associated with white garnet in the vicinity 

 of the Gatineau River, Canada, and also geodes of calcedony, 

 filled with water, from Uraguay ; by Mr. W. F. Chamberlin, a 

 garnet weighing 2 pounds and 1 1 ounces, 3f inches in diameter, 

 with faces curiously striated parallel to the lines of cleavage, found 

 on New York Island, near 145th street, where another had been 

 also seen, 5 inches in diameter, but broken. 



The President remarked that he had found geodes in cavities of 

 the tufaceous rocks of Oregon. These had been once filled by hot 

 water, carrying silica in solution, then partly or completely occupied 

 by a deposition of agate, onyx, etc., and on the erosion and re- 

 moval of the surrounding matrix, the geodes remained, thus repre- 

 senting casts of the cavities. 



A series of Trubelow's astronomical drawings was then ex- 

 hibited by Dr. Newberry, and pronounced the most striking and 

 satisfactory ever made. 



Dr. N. L. Britton then presented the following paper, illustrated 

 by a collection of fossils : 



notes on the cretaceous marl-belt of new jersey. 

 (Abstract.) 



The notes had been taken during a six weeks' collecting tour, in con- 

 nection with the Geological Survey of New Jersey. The special 

 object was to procure invertebrate fossils from the different marl beds 

 and associated strata, in order to aid in the preparation of a report, on 

 the invertebrate palaeontology of the State, by Prof. R. P. Whitfield. 



The geological structure, and the relations of the three marl beds, to 

 the other Cretaceous and Tertiary strata, were described.* The beds 

 are all referred to the Cretaceous Age, with the exception of the upper 



* For a detailed description, see " Geology of New Jersey," 1868. 



