During the Mediaeval Warming relative sea level rise was not accelerated, but the increase in the 17 th century was about coeval with the end of the Little Ice Age .
Colored letters indicate locations of cores studied.
The high accretion rates provide the opportunity of obtaining records with excellent temporal resolution. Buried cedar logs were 'mined' from the mid 18 th through the late 19 th century. Iron industry was established in 1816 AD along the uplands of Cedar Swamp Creek, North of Dennis Creek marsh. Vegetation in Dennis Creek marsh is dominated by Spartina alterniflora , the cord grass species which grows best in areas with twice daily flooding. The present marsh is thus largely a low to middle marsh , with relatively small, land-ward areas with higher marsh vegetation which includes Spartina patens , Typha angustifolium and Phragmites communis .