October 31, 2014
Columbia Geology Tour Part IV


Earth and Environmental Sciences
Higgins Professor

Carefully cut and sculpted red sandstone mark the distinctive facade of Russell Hall at Columbia Teachers College, along 120th Street. Like the red in our own blood cells, the sandstone stands as a crucial marker: It denotes a time around 2 billion years ago when humble algae pumped out enough oxygen to make the planet safe for life as we know it. Part 4 of the Columbia Geology Tour, following along with Professor David Walker as he talks about the stones that make up Columbia University buildings, and what they can tell us about Earth's past.