SECTIONS ALONG RICHMOND, FREDERICKSBURG AND POTOMAC R. R. 81 



The Patuxent surface is very uneven and angular. Supposed Lafayette 

 cobbles and boulders fill the erosion pockets. 



IV. Section in cut just north of PoliicTc. 



Feet 

 Pleistocene Ferruginous gravel 5-6 



Lower Cretaceous. Patuxent Coarse cross-bedded gray arkosic pebbly sand . . 10-15 



Total 15-21 



V. Section in cut south of Pohick. 



Feet 

 Pleistocene Brownish sand with gravel and cobbles 10-15 



Lower Cretaceous. Patuxent Litliified gray cross-bedded arkosic sand with 



thin lenses of drab clay 10 



Total 20-25 



VI. Section in cut one-quarter mile south of Lorton. 



Feet 

 Pleistocene Coarse buff sand and gravel with occasional 



cobbles 4-5 



Lower Cretaceous. Patuxent Coarse gray arkosic cross-bedded sand 10 



Laminae, pellets and balls of drab clay with leaf 

 impressions, including Brachyphijllum pur- 

 ceramosum Font., Dioonifes Buchiauiis (Ett.) 

 Born., Nageiopsif^ angustifolia Font., Nageiop- 

 sis longifolia Font., Podozamites acutifolius 

 Font., Podozamites distantinervis Font., 

 Sequoia ambigua Heer, BpJienolepidium Kur- 

 rianum (Dunk.) Heer, Sphenolepidium 

 Sternhergianum (Dunk.) Heer, Scleropteris 

 elliptica Font., Zamites tenuinervis Font., 



etc 2 



Greenish sandy clay 0-5 



Total 16-22 



The next important cut is that just south of Freestone which is given 

 in the Potomac Eiver sections. 



VII. Section in cut south of Powells Creek. 



Feet 



Pleistocene Ferruginous sand and gravel 2-5 



Eocene. Aquia Argillaceous glauconitic sands 10-20 



Lower Cretaceous. Patapsco Sandy, arkosic, cross-bedded sand with scat- 

 tered pebbles, clay pellets, and some large 

 clay balls 30-50 



Total 42-75 



