Alameda Shellmound Plaque
historic site
A metal commemorative plaque, fixed to a boulder from nearby Mount Tampalpais, in the Marine Headlands of Marine County, California.
- Material
- stone,_metal
- Inscription
- One thousand feet due west was a prehistoric mound, 400 feet long, 150 feet wide, and 14 feet high. The remains of 450 Indians with stone implements and shell ornaments were found when the mound was remove in 1908.
| Date | Sunrise | Golden hour | Sunset |
|---|---|---|---|
| March equinox | 07:13 | 18:47 | 19:21 |
| June solstice | 05:48 | 19:56 | 20:35 |
| September equinox | 06:57 | 18:33 | 19:07 |
| December solstice | 07:21 | 16:13 | 16:54 |
Local time (America/Los_Angeles).
37.75868, -122.23090
Elevation 5 m (modelled from terrain)