Hell Creek, Montana

K-Pg boundary

The Paleogene Tullock member of the Fort Union Formation exposed in badlands topography, Hauso Flats, Hell Creek, Montana. full size


The K-Pg “boundary clay” (upper pencil) above the IrZ tonstein (lower pencil) within the IrZ coal at Herpejunk, Hell Creek, Montana


A well-preserved animal burrow through a volcanic ash layer in the Hauso Flats Z coal.


UC Berkeley graduate student Isabel Fendley samples a trench across the K-Pg boundary for mercury abundance and carbon isotopes