The Cretaceous/ Tertiary Boundary At Iridium Hill, Garfield County, Montana
http://www.athro.com/geo/trp/ktm/ktintro_fc.html

Athro Limited


The goal of this virtual field trip to Iridium Hill, Montana is to investigate the disappearance of dinosaur fossils above the Cretaceous/ Tertiary boundary. The site provides rock outcrop photos of Cretaceous and Tertiary strata (Hell Creek and Fort Union Formations), stratigraphic sections and supporting text for this classic iridium-bearing locality. Topics include the K/T boundary, iridium concentrations, stratigraphy, sedimentology and, fluvial and lacustrine depositional environments.

This resource is referenced here:
Subject: Biology, Geoscience:Hydrology, Geology
Resource Type: Audio/Visual:Images/Illustrations, Activities:Virtual Field Trip, Activities
Focus on the Cretaceous: Paleontology
Topics: Earth surface, Hydrosphere/Cryosphere, Time/Earth History, BiosphereKeywords: ancient river deposits, Chicxulub impact, extinction