Assessing XRF for the geochemical characterization of radiolarian chert
artifacts from northeastern North America.
These blocks consist of basalt, radiolarian chert, limestone, and shale.
The basalt-chert unit is composed of hemipelagic mudstone and pelagic radiolarian chert with pillowed and bedded tholeiite.
Both, the lower Esperanza and the higher Matapalo Nappe contain basaltic rocks and radiolarian chert ("volcanic-sedimentary unit" of Tournon, 1984).
In addition, there are no observed depositional contacts between the radiolarian chert and the igneous rocks.