78 



The Lower Cretaceous Deposits op Maryland 



XYII. Section at Florida Avenue and Sixteenth Street, Washington, D. C, 



Pliocene (?). 

 Lafayette 



Cretaceous. 

 Patuxent 



beginning at 180 feet above tide. 



Feet 



Red loam, gravelly loam and gravel -with cobbles and 



boulders toward base 8 



Reddish brown stratified loam, vari-colored loam and 



clay interlaminated with brown sand 10 



Ferruginous gravel with boulders of crystalline and 



Newark rocks 10 



Arkosic cross-bedded pebbly sand with clay pellets, 



slightly carbonaceous in places 15 



Light greenish drab sandy clay 6 



Total 49 



Cretaceous. 



Patuxent 



XYIII. wen section at Pumping Station at Soldier's Home, Washington, D. C, 

 beginning 200 feet above tide. 



Feet. 



f Red clay 2 



Red gravel 2 



White gravel 3 



White clay 4 



Yellow clay 30 



Black loamy sand 6 



White gravel, water-bearing 6 



White sand 2 



Red clay 4 



Blue potter's clay 16 



Lignite 2 



Quartz sand, water-bearing 13 



Blue clay 50 



Sand and abundant water 8 



Gravelly clay 13 



Gravelly clay mixed with sand 2 



r". Soft rock " 5 



J " Hard ' granite ' rock " in vein 5 



I Gravel and sand, water-bearing 1 



LHard " nigger-head " rock 304 



Total 478 



Crystalline 



XIX. Section at East Washington Heights, near Overlook Inn, beginning 280 



feet above tide. 



Pliocene (?). Eeet. 



Lafayette . . . Loam and gravel 15 



Miocene. 



Calvert Fine yellow ocherous clay ("marlite") closely 



jointed with occasional small leaf imprints, grad- 

 ing into mealy sand, iron crusts at summit 40 



Cretaceous. 



Matawan . . . Dark colored, somewhat glauconitic sand 15 



rLight drab laminated sandy clay, at times carbo- 



naceous 8 



Magotny . . .J Loose buff, brown, yellow, gray, and white sugary 

 sands, more or less cross-bedded, and indurated, 

 f- with light drab leaf -bearing clay 25 



