Quartzite Outcrop in Brazil
May 29, 2007
The photo above showing an impressive outcrop with cross-banded stratification was taken near Diamantina, in eastern Brazil, in April of 2006. This rock is a depositional rift quartzite and is found at the bottom of the Espinhaço Sedimentary Sequence. The Espinhaço Range was formed intermittently in segments from the Paleozoic onwards. Higher summits are remnants of older surfaces that have been gradually worn down -- oldest surfaces date from the Early Cretaceous.