REPORT OF THE STATE PALEONTOLOGIST I903 183 



Streptelasma strict um is also apparently more abundant 

 in the lower than in the upper division. The upper beds are char- 

 acterized by the great abundance of Coelospira con- 

 cava. Common also in the upper beds are Atrypina im- 

 bricata, Strophe odonta becki, Trematospira 

 multistriata and Cyrtolites expansus. Such 

 forms as Strop heodonta becki and Strophonella 

 headleyana are found much more frequently in shale than in 

 limestone. This is also true of Spirifer macropleura 

 but does not hold apparently for such species as D e 1 1 h y r i s 

 perlamellosa and Coelospira concava which are 

 found with equal frequency in shale and in limestone, 



Becraft limestone 



This is a very dark gray, heavy bedded limestone. The lower 

 portion is coarsely crystalline, a coarse calcarenite. Most of the 

 formation, however, is finely crystalline, even at times rather shaly. 

 A thickness of i6 feet is included in this formation. The lower 2>2 

 feet are characterized by a great abundance of G y p i d u 1 a 

 pseudogaleata, the typical Becraft fossil. In this bed are 

 also numerous specimens of E d r i o c r i ,n u s p o c i 1 1 i f o r m i s 

 and Leptaena rhomboidalis. The great abundance of 

 the latter and several other New Scotland species in the Becraft 

 of northern New Jersey is considered by Weller to be the chief dif- 

 ference which distinguishes its fauna from that of the preceding 

 and succeeding beds.^ Gypidula pseudogaleata was 

 not found in the rest of the formation but owing to the great 

 abundance of Spirifer concinnus which in great numbers 

 usually characterizes the Becraft, and also of Leptaena 

 rhomboidalis and Atrypa reticularis, these 14 feet 

 are included. Spirifer concinnus is at times so abundant 

 in these upper beds as to practically make up the entire rock mass. 

 The other fossils also are those which are specially noticeable in the 

 Gypidula pseudogaleata beds ; yet the entire Becraft 

 here represents a temporary invasion of a few typical Becraft species 

 into the very slightly changing New Scotland seas, so that the mass 



'Weller. Snr. N. J. 3:93. 



