142 Sea Level Processes and Effects of Sea Level Change
Fig. S.12. Overwash fans on SI. Joseph 's Island, Texas. produced by storm waves.
Open Gulf to the left, lagoon to the right. [Photo courtesy D. L. Eicher]
Gatveston - B<;IY
G.- Island
GuH of Mexico
o
2
3
Isochrons. years before present
I>:·· /:·>' : ' ~ ·I barrier sands
W:;;j lagoonal and intertidal muds
4
Skm
t------~ marine interlayered sands
- - -
and clays with shells
~ Pleistocene basal sediments
Fig. S.B. Architecture of Galveston Island. Regressive sequence below the barrier beach near
Galveston, Gulf of Mexico. Advance of barrier island is due to high supply of sand and relatively
stable sea level. The dates ( 1200. 2000, 35(0), are based on the 14C content of shells. [J. R. Curray,
1969. in D. J. Stanley. ed. The new concept of continental margin sedimentalion. Am Geol Inst.
Washington DC]