R. M. Larson No description specified. 1-3 (3 Records) Documents Opal Phytolith Investigations at the Tenderfoot Site: A Proposal for the Paleoecology and Archaeology of the Intermountain Region of Colorado Preliminary Report: Opal Phytolith Investigations of Feature Fill 5Gn1835 Preliminary Report: Opal Phytolith Investigations of Feature Fill 5Gn1835