500 RECORDS 



kill group, and many of the sandstones of the coal measures of 

 Pennsylv^ania and the Mississippi valley, in fact the greater part 

 of the "barren Measures." 



Dr. White described his recent detailed study of the faunas 

 of sucessive strata at Glens Falls, and their relations to similar 

 studies along the lake Champlain valley to the north, and the 

 Mohawk and Black Riv^er valleys to the west. The section 

 forms a low anticline along the shore of the Hudson. At the 

 base is seen the Calciferous sandrock, containing OpJiilcta and 

 fucoids. Conformable upon this is a layer a few inches thick, of 

 barren black shale, which is very much crushed, and then the 

 same beds of the ostracod-Liperditia^ and their associated corals 

 and peculiar forms of StropJiomcJia, as have been found in the 

 lowest Black River zones on Button Island in Lake Champlain. 

 The zones of ParastropJua and Triplcsia occurring near this por- 

 tion of the series in localities to the north and west, were not 

 found here. The succeeding coral beds of Colinnnaria were well 

 developed. Above these are the cross bedded gray beds, which 

 in some recent reports have been considered to represent the 

 Birdseye limestone, which seems to be lacking in this locality, 

 unless met with at this unexpectedly high position. The upper 

 portion of the section, which is of lower Trenton age, shows no 

 unusual forms. The tendency of the lowest and uppermost por- 

 tions of the Ordovician sections in the region to wear away and 

 appear wanting, owing to their prevailing softness, was com- 

 mented on. 



The remarks of Dr. Washington were in the nature of a 

 preliminaiy report on work done by Professor Pirsson and him- 

 self on Mount Belknap and Red Hill, near Lake Winnepesaukee, 

 N. H. The rocks of Mount Belknap are shown to be promi- 

 nently a quite uniform alkali syenite, which is cut by many dikes 

 of camptonite and allied rocks, and of bostonites, aptites, and 

 syenite porphyries. These dikes also cut the surrounding por- 

 phyritic gneiss. At one place, near the border, is a mass of 

 basic hornblende-gabbro, with large, poikilitic phenochrysts of 

 brown hornblende. A syenite breccia also occurs. At Red Hill 

 similar syenite, formerly described by W. S. Bayley, occurs on 



