12 NEW YOBK STATE MUSEUM 



The Becraft limestone, a heavy bedded rock, hard, gray and sub- 

 crystalline, occupies the position of the Scutella limestone as developed 

 Jn the Helderberg and Schoharie sections and probably represents both 

 the Scutella and Upper Pentamerus limestones of those sections. Over 

 the summit of the Becraft limestone on the eastern ridge of the moun 

 tain the surface slopes gradually downward to the west and follows the 

 dip of the strata. 



At the base of this slope is a marshy area draining toward the 

 south, and in the vicinity of this low region and above it for about 

 one third the width of the slope is the outcrop of the Oriskany 

 which was not recognized by Prof. Davis. This is largely concealed 

 under the soil, and there are no very clearly defined exposures of it 

 except where the soil has been removed from small areas, in which 

 case the surfaces rather than the edges of the strata are seen ; but a 

 considerable quantity of the rock that has become loose has worked 

 up through the soil, and is not only found near its proper site but is 

 scattered abundantly through the stone walls in the immediate vicinity 

 of the strata themselves, so that the material is to be looked for and 

 found most abundantly on the westward slope of this syncline and in 

 the vicinity of the little stream throughout its extent. These strata, 

 highly silicious, hard, dark limestones, have been most favorably 

 exposed to decomposition, and in consequence the calcareous matter has 



22 Becraft limestone. This name was introduced by N. H. Darton with the 

 .sanction of Prof. James Hall, for the beds previously known as the Upper Pentamerus 



and Scutella limestones of the Helderberg sections. The present name is derived from 

 Becraft mountain, Columbia county, N. Y. 



23 Kingston beds (new). The " upper shaly beds " of W. M. Davis, which are 

 typically exposed and attain a thickness of 250 feet in the vicinity of Kingston N. Y. 



24 Esopus grit. Proposed by Darton with the approval of Prof. Hall, for the old 

 term Cauda-galli grit. It has been suggested by Freeh that the Esopus grit should be 

 regarded as a part of the arenaceous sediments of the Oriskany. The very few fossils 

 which it contains, however, do not as yet fully indorse this suggestion. 



25 Catskill sandstone. This is an approximate expression of the value of this 

 formation. Catskill sedimentation doubtless began as early as Portage time, its 

 representation during which is expressed in the term, Oneonta beds. 



