Image from the Biodiversity Heritage Library.
Contributed by Smithsonian Institution Archives.
| www.biodiversitylibrary.org
Transcription
Portland Chantrey G
907 / 1887
(S51)
1227.
A 1 -- About 20 feet above Lake.
Lake 573' + 20' = 593'.
Across to the dam
= Stratigraphically the zone of Forestville
in Walnut Creek calls S.3.83' what is
then at about 850' A.T.
- making a fall southward of 260 feet.
from Forestville to Portland