ABSTRACT
Though presenting limitations that inhibit their use in heavily trafficked pavements, weathered basalts have proved to be suitable for low volume roads (Núñez et al, 2000).
2 BRIEF OVERVIEW
2.1 Volcanism in Southern Brazil
The volcanic activity that originated the lava spills of the Parana Basin covers an area of 1,200,000 km2 and
dates from the middle part of the lower Cretaceous age (120 to 130 million years ago). The rock composition varies from basic to acid, including several intermediates.
