CHAPTER 3 . Coastal Lagoons of Southeastern Brazil
PLEISTOCENE
L.Araruama
- lOkm
I
I
I
5100 yr BP
I
-15 km
I
I
I
HOLOCENE
PLEISTOCENE
HOLOCENE
I
5100yr BP
I
I
I
I
,-__ I ~.....
Sea Level
- 90km
I
PLIOCENE
PLEISTOCENE
I
HOLOCENE
LOWER
MIDDLE
UPPER
I
I
I
I
BARRIER I
: BARRIER II : BARRIER III
I
BARRIER IV
I
I
123000yrBP
5100yr BP
I
I
I
I
I
I
Sea
level
o Holocene marine deposits
Alluvial fan deposits
o Pleistocene marine deposits
Eolian deposits
o Pleistocene deposits
•
Lagoon deposits
41
Fig. 3.7. Schematized examples of the evolution of Pleistocene and Holocene sand barrier sequences
and lagoons in the state of Rio de Janeiro
cated the furthest inland. Barrier IV is along the coastline and corresponds to the last
Holocene transgressive-regressive phase. Lagoons and lakes enclosed by this barrier
include Peixe L., Mangueira L., and Tramandai-Imbe L. (Schaffer 1988). The PatosMirim Lagoon system, located farther inland, is embedded in Barrier III, which rep-