MARYLAND OTOLOGIC AL SURVKY 51 



tions being found ;it Clifton Beach, along Port Tobacco River, and at 

 Popes Creek. Since the deposits are in general at lower levels tlian in 

 Prince George's county, on account of the easterly dip of the beds, the 

 surface outcrops are largely fov.iv-d by tli<' Xi'Dfi-rx' jind Pb'islofon'' 

 formations. 



VII'.GIXIA. 



The most complete section of tlie Eocene in the whole Middle Atlantic 

 Slope is afforded by the series of high bluffs on the western bank of the 

 Potomac river between Aquia Creek and Mathias Point, in eastern Staf- 

 ford and northern King George counties. The peninsula between the 

 Potomac and Eappahannock rivers is to a large extent formed of the 

 Eocene greensands, which also appear in places along the banks of the 

 latter stream, outcropping beneath the Columbia formations. The 

 higher levels of the intervening country are generally capped by the 

 Xeocene formations. 



Southward the Eocene deposits are continued in eastern Spottsyl- 

 vania and in Caroline counties. Fine bluff's of the characteristic marls 

 appear on the south bank of the Rappahannock at several points above 

 Port Royal, but in the valley of the Mattapony they are much less prom- 

 inent, although occurring at frequent intervals. An extensive cover of 

 Xeocene deposits occupies the higher portions of the country. 



In the valley of Pamunkey river and its tributaries, particularly in 

 Hanover county, important outcrops of the Eocene are found. Many 

 of the fossils described by Conrad and Rogers were obtained from this 

 area. 



Farther south, in the valley of the James river, are many of the most 

 notable occurrences of the Eocene in the whole region. At Richmond, 

 City Point, Evergreen, and Tar Bay prominent exposures are found, 

 the two latter localities particularly being rich in organic remains. At 

 Petersburg and vicinity the Eocene is exposed in the valley of the Appo- 

 mattox, but the sections are in the main poor. South of Petersburg the 

 only exposure so far as known is at Boiling's Bridge, on the Xottoway 

 river. 



