St. Cloud, Minnesota area - Igneous and Metamorphic Petrology - Spring semester

Bedrock outcrops in the areas surrounding St. Cloud, Minnesota, contain great examples of coarse-grained igneous rocks that are part of the East Central Minnesota Batholith (ECMB), a large complex of granitic rocks that were emplaced following the Penokean Orogeny approximately 1.8 billion years ago (Ga, or Giga annum). These rocks have long been quarried for ornamental stone and aggregate.

2007 | 2006