426 



PROCEEDINGS OP THE ACADEMY OP 



As the last mentioned section of the New Jersey rocks will aid in the clear 

 understanding of remarks and comparisons in other portions of this paper we 

 reproduce it below as originally published by us in the paper last above ci'ted. 

 The reader will understand that by formations No. 1, No. 4 and No. 5 of Ne- 

 braska, in the right-hand column, we referred to the Dakota Group the Fort 

 Pierre Group and the Fox Hills Beds of this paper ; the intermediate No. 2 

 and No. 3, (Fort Benton Group and Niobrara Division,) being probably wantine 

 in New Jersey. J & 



New Jersey Section Compiled from the Reports of that State. 



3 'O 



" OS 

 TS . 

 CO O 



Green Sand. 



60 ft. 



" The saud between the second and third beds has usually been con- 

 founded with beach sand, which it closely resembles." 45 or 50 ft. 



Yellow limestone. 



Green Sand, Scaphites Conradi, Baculites ovatus, Ammonites 

 placenta. 45 or 50 fu 



Sand " much colored with oxyd of iron, and when sufficiently 

 firm is found almost full of the impression of shells." Belemnites 

 mucronatus* 65 or 70 ft 



-a 

 v c 



03 

 5 O 



Green Sand, Nautilus Dekayi, Baculites ovatus, Belemnites mucro- 

 natus ,* and bones of Mosasaurus. 50 ft. 



*3 ^ 





Dark clays with "occasional streaks and irregular spots of green 

 sand." Ammonites placenta <,, Baculites ovatus, &c. &c. 130 ft. 



Dark blue, ash colored, and whitish clays, and micaceous sand, 

 with thin seams of coal. Great quantities of sulphuret of iron. 

 " Fossil wood is found in some of the layers in large quantities, and 

 some very distinct impressions of net-veined leaves were examined in 

 the clay at French's landing." 130 ft. or more. 



o 

 <5 



S..C 



In an able and lucid article by Prof. Hall, on the distribution of the Creta- 

 ceous rocks of America, and their relations at distantly separated localities, 

 published in the American Journal of Science, July, 1857, it will be seen he 

 has arrived at nearly the same conclusions in regard to the Nebraska and N. 

 Jersey beds. He likewise draws the same parallels in an elaborate article in 

 the first vol. of the Report on the U. S. and Mexican Boundary Survey, pub- 

 lished during the summer of 1858.f 



The Fort Pierre Group generally abounds in fossils in Nebraska, though they 

 are not equally distributed through the whole formation, there being an upper 

 and a lower fossiliferous zone, while a considerable thickness of the middle 

 beds usually contains few organic remains. Its fossils are generally found in a 



* Belemnitella mucronata. 



t This volume of ihe Mexican Boundary Report bears the date of 1857 on the title- 

 page, but it was not actually published until the summer of 1858. See American Journal 

 of Science and Arts for July, 1859, p. 149. 



[Deo. 



