A>12,000-Year Record of Natural Levee Sedimentation Along the Broad River Near Columbia, South Carolina

S o u t h e a s t e r n G e o g r a p h e r V o l. X X X V III, N o . 2 , N o v e m b e r 1 9 9 8 , p p . 9 5 -1 1 1 A >12,000-Y E A R RE CO R D O F N A T U R A L LEV EE SE D IM E N T A T IO N A L O N G TH E B R O A D R IV E R N E A R C O L U M B IA , SO U TH C A R O L IN A 1 D a v i d S . L e ig h A n 8 .1 m s tr a tig r a p h ic s e c tio n b e n e a th a n a tu ra l le v e e a lo n g th e B r o a d R iv e r n o rth o f C o lu m b ia , S o u th C a ro lin a , w a s s a m p le d fo r s e d im e n to lo g ic a l a n a ly s is w ith a g e c o n tro l p ro v id e d b y ra d io c a r ­ b o n d a te s a n d a r c h e o lo g ic a l d a ta . R e s u lts re v e a le d a 7 m th ic k s e c tio n o f n a tu ra l le v e e s e d im e n ts th a t s p a n s m o r e th a n 1 2 ,0 0 0 y e a r s o f la te s t P le is to c e n e a n d H o lo c e n e tim e . S ix s tra tig ra p h ic u n its w e r e r e c o g n iz e d in th e 8.1 m s e c tio n , in c lu d in g b a s a l U n its 1 a n d 2 th a t re p re s e n t te rm in a l P le is ­ to c e n e b e d lo a d a n d c h a n n e l fa c ie s o f th e B ro a d R iv e r. U n its 1 a n d 2 a r e o v e rla in b y fin e s a n d y a n d s ilty n a tu ra l le v e e d e p o s its o f U n it 3 , w h ic h re p re s e n ts te rm in a l P le is to c e n e o v e r b a n k s e d im e n ta ­ tio n a n d c o n ta in s a lig h t s c a tte r o f a r c h e o lo g ic a l m a te r ia l ( p r o b a b ly P a le o in d ia n ) n e a r its to p . C o a rs e s a n d y o v e r b a n k s e d im e n ts o f U n it 4 a b r u p tly o v e r lie U n it 3 a n d r e p re s e n t r e la tiv e ly h ig h e n e...