1912.] 



NATURAL SCIENCES OF PHILADELPHIA. 



379 



of swamp development', attributable to a temporary modification of 

 climatic conditions, which would of course affect the whole region 

 at the same time, the fossils from the various places could hardly 

 be expected to be otherwise than equivalent. It is these that are 

 used in correlation of the "Newark" with the European Keuper. 

 The only fossil locality at any considerably lower horizon is that at 

 Holicong, ]3ucks County (B. 2). The forms occurring there are 

 unfortunately not specifically identifiable, and so yean throw little 

 light on/the age of the beds. But since both Cytiadites and Schizo- 

 neura are genera which are found in the Bunter/r lower Triassic of 

 Europe, it is by no means impossible that the/^orristown-Stockton 

 formation is really the approximate equivalent of that horizon, 

 which it certainly closely resembles lithologfcally. 



^use of the total absence of fossils of diagnostic value in tin- 

 upper 10,000 feet of the Brunswick for/hation in Pennsylvania, its 

 exact position is also indeterminate,/ It further does noy seem 

 advisable to attempt extrapolation into other districts, where the 

 succession of formations is in general quite different from ./hat here 

 But the absence of bofls of uppermost Triassic or even 



be/regarded as certain. 

 en/that there is no evicWhce whatever 

 of the New Red or/Newark group 

 )ut since air of the fossils of diagnostic 

 Triassic age, hrfve come from a 

 the middle of the/group, we are not 

 justified in concluding either that the whole grojlp is of the same age 

 or that the Bunter sandstone below and the upjer Keuper or Rha3tic 

 above are not represented in the American rod 



outlined, 

 of Jurassic age can in no way 

 It is to be concluded, th 

 of the deposition of any pa 

 during the Permian period; 

 value, indicating middle-u 

 rather limited horizon, abou 



