Mare Island shell midden
Deteriorating shell midden
Elevation 23 ft.
Joel seems to have a nose for midden. Keep sniffing ’em out Joel!
This is probably one of the two “shell heaps” on Mare Island marked on N. C. Nelson’s 1909 map. Note the contrast between dark midden and tan soil.
Joel thinks the shell fragments and midden soil are sloughing off from above.