83 



PHYSIOGRAPHY AND GEOLOGY OF THE COASTAL PLAIN PROVINCE. 



The next section near Cherry Hill shows similar Patuxent materials 

 rising for some 30 feet above the track directly overlain by 10 feet of 

 surficial deposits, the Aquia being cut out. 



From this point to Aquia Creek no good outcrops of Potomac materials 

 are exposed although low exposures of the usual arkosic sands are seen at 

 intervals overlain by Eocene or Pleistocene materials. 



VIII. Section in first cut south of Aquia Creek. 



Feet 

 Pleistocene Sandy loam and soil 6 



Eocene. Aquia Glauconitic sand, sparingly fossiliferous 15 



Lower Cretaceous. Patapsco Coarse cross-bedded gray sand with iron crusts 15 



Greenish and drab arenaceous leaf-bearing clays 

 with Acrostichopteris longipennis Font., Ne- 

 liimbitcs tenuinervis (Font.) Berry, Populo- 

 phyllum reniforme Font., Sapindopsis brev- 

 ifolia Font., magnifolia Font., and variabilis 

 Font., Splvenolepidium sternbergianii/m 



(Dunk.) Heer, etc 20 



Coarse cross-bedded arkosic sand with pebbles 



and clay pellets 18 



Lighter more argillaceous arkosic materials 

 exposed to R. R. track 15 



Total 89 



The track is about 20 feet above tide, and up the creek a short dis- 

 tance variegated Patapsco clays are visible near the water's edge. 



IX. 



Pleistocene 



Eocene. Aquia 



Lower Cretaceous. Patapsco 



Section at 72-nnle Post. 



Feet 

 Pebbly soil grading down into coarse reddish 

 argillaceous sand with pebbles and clay 



pellets 5 



Unconformity 



Glauconitic argillaceous sands 20-25 



Argillaceous sand with local cobbles up to 5 



inches in diameter 1 



Brown sandy clay with leaf impressions 1-2 



Drab argillaceous sand 1-2 



Coarse, arkosic, gray, argillaceous ferruginous 



cross-bedded sand, carrying pebbles 6-8 



Total 43 



