Pete Tillman
Tafoni ractrack!
An odd little feature among the many tafoni at the Harvey St. beach. There's a Hollow tafoni at center, one of a bunch I saw here, and haven't seen before. Plus: look at that little racetrack worn around it! That striped pebble at 10:30 seems to be carving (at least) that part of the arc, in the same process that creates potholes in streams. Camera is looking down onto a horizontal surface on the rock. We're well into the surf-zone here....
The 'race-track' is maybe 2. 5 inches (6 cm) across. The blue shadows are often seen at sunset (as you already know?). Photo taken maybe 5 min before sunset.
Tafoni ractrack!
An odd little feature among the many tafoni at the Harvey St. beach. There's a Hollow tafoni at center, one of a bunch I saw here, and haven't seen before. Plus: look at that little racetrack worn around it! That striped pebble at 10:30 seems to be carving (at least) that part of the arc, in the same process that creates potholes in streams. Camera is looking down onto a horizontal surface on the rock. We're well into the surf-zone here....
The 'race-track' is maybe 2. 5 inches (6 cm) across. The blue shadows are often seen at sunset (as you already know?). Photo taken maybe 5 min before sunset.