This paper was
prepared for “Talk About the Bay”, a program sponsored by the Ocean
Outfall Group et al at Vets Hall on 9-2-06. It was very well
received! However, a few points needed clarification.
I received many
questions about the maps on page 2. The vertical lines tangent to
the west side of the Rock are parallels to the 120 degrees 52
minutes 30 seconds longitude line, and lie at longitude 120 52
25.96. For this study, positions of the western (ocean side) and
eastern (Bay side) of the Sand Spit were measured in millimeters
east of those longitude lines.
In addition to the
beetle on page 5 I inserted a picture of a very camouflaged moth at
the bottom of page 7. This insect drew my attention by darting
upward into the wind every few minutes. It always landed next to a
leaf or twig, next to which it was almost impossible to see while
analogized that the upwelling at the foot of a slide is like the
squishing action that occurs when we step in mud. He reminded me
that not all sites were identical, and introduced me to the concept
of “rotational landslides”.