The original aerial photo (178 K)
More information on the nature of the marshes of Marin and the S.F. Bay area can be found on this page featuring the salt marshes of Marin.
Information on the land-use of former marsh and open water areas of San Francisco Bay can be found here
The subdivision at the top is built on filled marsh land and has suffered subsidence of up to 6 feet in some locations.
The road cut on left side of highway has an exposure of layered greywacke and shale.
The entrance road to our Ring Mountain hike is at lower left.
