72 



PHYSIOGRAPHY AXD GEOLOGY OF TPIE COASTAL PLAIX PROVINCE. 



V. Section Dumfries Wharf just above Quantico Creel-. 



Feet 

 Pleistocene Ferruginous sandy loam with gravel bed and 



boulders at the base 15 



Lower Cretaceous. Patapsco Gray arkosic sand more or less indurated and 



cross-bedded below, with small lenses of sandy 

 clay carrying leaf impressions including Acro- 

 stichopteris longipennis Font., Brachyphyl- 

 lurn crassicaule Font., Sassafras sp., Sphenole- 

 pidis sfernbergiana (Dunk.) Schenk, Za mi- 

 tes teniiinervis Font., etc 6-10 



Total 21-25 



VI. Section just above Wideivater, Virginia. 



Feet 

 Pleistocene Sandy loam with gravel base al)out 10 



Lower Cretaceous. Patapsco Coarse, arkosic, cross-bedded, partially lithified, 



somewhat argillaceous sand 15-20 



Local unconformity with iron crusts. Chloritic 

 sandy drab clay with leaf impressions includ- 

 ing A7-aucarites aquiensis Font., Sassafras sp., 

 Sapindopsis variabilis Font., Zamites teniiin- 

 ervis Font, etc., exposed to water 5-10 



Total 30-40 



The foregoing exposure is continuous along the river, the lithologv heing 

 variable. About one-quarter of a mile above the section just given, the 

 same flora is found above the unconformity, showing that it is purely local 

 in character. 



VII. Section one-quarter of a mile above last. 



Feet 

 Pleistocene Sandy loam with gravel 8-12 



Lower Cretaceous. Patapsco Argillaceous sand with lenses of brownish sandy 



clay carrying leaf impressions including 

 Araucariies aquiensis Font.. Biachyphylluni 

 crassicaule Font., CehistrophyUum acutidens 

 Font., FeistmantelUa ohlongu Ward, Ony- 

 chiopsis psilotoides (Stokes & Webb) Ward, 

 Pinus vernonensis Ward. Popniophyllum re- 

 niforme Font., Sapindopsis magnifoUa Font.. 

 Sapindopsis variabilis Font., Saliciphylluvi 

 parvifolium Font., Sphenolepidiuiii Sterii- 

 bergianuin (Dunk.) Heer, Zamites tenuiner- 

 vis Font, etc 15-10 



Local unconformity with iron cruf to. 



Coarse, arkosic, cross-bedded, argillaceous sand 



exposed to water 5-10 



Total 28-42 



