TITLES AND ABSTRACTS OF PAPERS 39 



TITLES AND ABSTRACTS OF PAPERS PRESENTED BEFORE THE SECOND SECTION 

 AND DISCUSSIONS THEREON 



The second section met at about 2.30 o'clock p. m., under the chair- 

 manship of President E. A. Smith, and listened to the papers scheduled 

 under Group B : Stratigraphic, Paleontological/ Areal, and Carto- 

 graphic. E. W. Berry served as secretary of tlie section. 



CHARACTERISTICS OF A CORROSION CONGLOMERATE 

 BY F. W. SARDESON 



{Abstract) 



A conglomerate in the Galena limestone formation was described. It con- 

 sisted of black pebbles in a bluish matrix. The pebbles were. a foot and less 

 in width. This conglomerate contained marine fossils, those found in the 

 pebbles being the same as those in the matrix. It is thought to be the result 

 not of erosion by waves, but of corrosion by the sea under conditions that were 

 described. This conglomerate is one of many which are found in the Ordo- 

 vician and Cambrian of this region. They are all associated with marine 

 faunas, and therefore might be interpreted as evidence of marine recession 

 and transgression, according to the prevailing theory of the present time. 

 Most of them are thought by the author to be of different origin. 



Eead in abstract from manuscript. The paper was discussed by 

 Messrs. T. W. Yaughan, David White, E. 0. Ulrich, and Charles Schu- 

 chert. 



A PRE-CAMBRIAN UNCONFORMITY IN VERMONT 

 BY AETHUE KEITH 



{Abstract) 



In recent years the west border of the Green Mountains has been examined 

 in search of a possible root for a great thrust fault in the Taconic Mountains 

 which has bfien described to the Society at its last two meetings. This search 

 has brought to light a broad relation of much importance in the Cambrian 

 and lower beds. 



The Cambrian consists of numerous distinguishable formations of limestone, 

 dolomite, and sandstone, the lowest being a mass of quartzite. Fossils of the 

 Olenellus zone are found in the limestones and upper part of the quartzite. 

 Below these is a great thickness of schist, dolomite, graywacke, quartzite, and 

 conglomerate. These lower rocks are separated from the Cambrian by a great 

 unconformity, above which the Cambrian quartzite transgresses the entire 

 lower series. There is abrupt removal of the formations under the uncon- 

 formity, along which visible breaks of deposition and erosion are seen, and a 

 basal conglomerate, with pebbles of the underlying rocks, lies at the base of 



« Purely paleontological papers were referred to the Paleontological Society for reading. 



