Maryland Geological Survey 



79 



Raritan . . 



Patapsco . 



Patuxent . 

 Crystallines . . 



Feet. 



'Massive and stratified bluish drab clay, at times 

 lignitic and pyritous and occasionally blotched 



with red ochre 10 



White clay in local lenses. Massive and stratified 



light-colored and drab clay, interbedded 10 



''Dense variegated and drab, jointed clay grading at 

 times into sand, lower portion more or less covered 



by flanking of Pleistocene and wash 100-|- 



Red and drab clay with ferruginous sandstone largely 



^ covered by flanking of Pleistocene and wash 70+ 



. Beginning 20 feet below tide. Cross-bedded arkosic 



sand, with interbedded clay, estimated 440 



. At level below tide of 460 feet. 



Total 744 



XX. Section at Fort Foote, Prince George's County, about 200 yards below 



Notley Hall Wharf. 



Pleistocene. Feet. 



Wicomico . . . Sandy gravel with cobbles and boulders 10 



Cretaceous. f Tough, variegated clay 12 



Strongly cross-bedded medium fine grayish carbo- 

 naceous sand compact toward top with interbedded 

 Patapsco . .^ lenses of stratified drab or chocolate-colored clay 

 charged with comminuted vegetable matter and occa- 

 sional well-preserved leaf impressions ^ 30 



^Dense, tough, chloritic, variegated clay to tide 10-12 



Total 64 



XXI. Section at Fort Washington, Prince George's County, at excavation east 



of wharf. 



Pleistocene. 



Wicomico 

 Eocene. 



Aquia . . . 



Feet. 



.Coarse gravel 



Cretaceous. 

 Matawan 



Patapsco 



Red sand with casts of Turritella, Dosiniopsis, Cyth- 

 erea, Crassatella, Ostrea, etc 12 



Light variegated sand, slightly glauconitic 10 



Dark micaceous sand with Cyprimeria densata, Cras- 

 satella vadosa, Guculaea vulgaris, etc 10 



Dense, massive, jointed, variegated and drab clay, gyp- 

 seous above, occasional ironstone crusts 55 



(Exposed near wharf) light gray lignitic sand, with 

 much iron stained clay balls and with lenticular 

 pockets of dark gray lignitic clay carrying indistinct 

 impressions of plants 4 



Total 99 



^ See list of species in Tables of Distribution. 

 6 



