Colorado River guidebook: a geologic and geographic guide from Lees Ferry to Phantom Ranch, Arizona

Guidebook, Road Log, [Rama diabase][Rama sills](Rama Fm)(Grand Canyon sills)[Unkar sills], [Cardenas Basalt](Cardenas lava series)[Cardenas Lava][Cardenas Lavas] - Unkar Group - Grand Canyon Supergroup - Middle Proterozoic,