LATJGER RELATION'S OF DELTAS 407 



land flora, and in its sedimentary character is transitional between the 

 fresh-water deposits below and the typical marine formations of the 

 Upper Cretaceous which overlie it. A summary statement of these 

 Mesozoic formations is repeated here from the columnar section of the 

 Patuxent folio. 



UPPER CRETACEOUS 



Monmouth forniaiion, 40 to 50 feet. 



Reddish-brown and greenish-black sand, witli many irregulai- iioii 

 crusts. 



Matawan formation, 45 to 50 feet. 



Gray and black micaceous sandy clay carrying glauconite. 



Unconformity 



Magothy formation, to 40 feet. 



Thinly laminated sand and clay, with much lignite and occasional 

 ferruginous sandstone. 



Unconformity 



LOWER CRETACEOUS 



Raritan formation, 100 feet. 



Variegated clay, sand, and gravel, with some lignite. 



Unconformity 



Patapsco formation, 100 feet. 



Highly colored variegated chiy interbedded with sand and gravel. 



Unconformity 



JURASSIC 



Arundel formation, to 125 feet. 



Drab, red, and black clay carrying lignite and iron ore. 



Unconformity 



Patuxent formation, 340 feet. 



Light-colored, arkosic sands, with clay lenses and grnvcl hands 



Unconformity 



ARCHEAN 



In regard to the interpretations given as to the conditions of sedimen- 

 tation the following statements are quoted from the Patuxent folio, pages 

 9 and 10, published in 1907: 



