The astonishingly far inland dune-sea at 16th Avenue and Strawberry Hill in San Francisco, approximately 109 years ago, before being engridded and buried by homes.I remember when an earthquake hit the S.F. area, the instability of highway overpasses and homes was attributed to the vibration-induced "liquefaction" of sand underlying the structures. This old photo shows why that might have happened.
The curves at the top of the picture appear to be part of a frame or an artist's borders on a postcard. Credit, via BLDGBLOG.