30 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 149 



Bayou Bartholomew flows upon the Wicomico terrace at Bastrop, 

 where it adjoins the Okefenokee terrace. Four miles east of Bastrop 

 the Wicomico abuts the Sunderland terrace, from which it extends 

 eastward into Mississippi (figs. 13, 14). 



In Mississippi the head of the Wicomico embayment is masked by 

 distributaries of the contemporary Mississippi delta. Parts of the ter- 

 race occupy the eastern part of the Swan Lake quadrangle and much 

 of the adjoining Auter quadrangle in Washington, Humphreys, and 

 Sharkey counties (fig. 14). From Yazoo City southward the shore 

 followed the bluff into Louisiana. At a low cape 3 miles southeast of 

 Port Hudson, East Baton Rouge Parish, the shore turned eastward 

 along the expanded Gulf of Mexico. 



The name Wicomico terrace dates from 1901, when Shattuck 

 (1901, p. 103; 1906, p. 71) applied it to a marine terrace in 

 Maryland whose shore line now stands about 100 feet above sea 

 level. The name has been used repeatedly since then for all the states 

 from Maryland to Florida. 



Fisk's (1938a, p. 51) name Prairie terrace evidently is a synonym 

 of Wicomico terrace. The name was "proposed for a terrace typically 

 developed near Aloha, sec. 16, T. 7 N., R. 4 W., Grant Parish, and 

 at Nebo School, irregular sec. 40, T. 7 N., R. 3 E., La Salle Parish" 

 in Louisiana. At Aloha (Montgomery quadrangle) and also at Nebo 

 School (Jena quadrangle) this plain is bounded by the 100-foot con- 

 tour line. Aloha lies within the Wicomico estuary of the Red River 

 about 6 miles above Colfax ; Nebo School stands on the shore of the 

 wide entrance to a larger Wicomico bay about 23 miles southwest of 

 Harrisonburg. 



The Port Hickey terrace of Matson (1916, p. 190) as defined by 

 Fisk ( 1938b, p. 8) is here interpreted as equivalent to the Wicomico. 

 It slopes up from more than 90 feet above sea level at Port Hickey 

 (Port Hudson quadrangle) to 100 feet at Port Hudson, a mile and 

 a half away. 



MacNeil (1950, p. 99) regarded the Wicomico as a peak of marine 

 transgression. This assumption seems to be corroborated by Colqu- 

 houn (1964, p. 137), who finds the Okefenokee Formation to be 

 overlain unconformably by Wicomico terrace deposits in the Eutaw- 

 ville quadrangle of South Carolina. 



At the end of Wicomico time the Gulf withdrew to a lower level 

 and came to rest at 70 feet. 



Penholoway terrace {shore line 70 feet). — At the 70-foot stage a 

 bay about as long as Chesapeake Bay and more than twice as wide 



