Image from the Biodiversity Heritage Library.
Contributed by Yale Peabody Museum of Natural History.
| www.biodiversitylibrary.org
Transcription
Four Mile Canyon reconnaissance
The road cut shows black shale resting on massive, quartzose, x / low ss which is Lytle. The 3 SS in lytle of road cut coalesce up hill to north and coalesce with pellets green marlson come in. Would estimate maximum thick ness along ridge mark to north of about 65',