Similar to the issue around "cracle" posted earlier, I get this kind of stuff in
a lot of olderish renders. Here's a stripped-down piece of ocean that exhibits
it, for example:

// -------------------
#include "functions.inc"

camera {
  location  <3, 1.8, 1>
  look_at   <0, 0,  -.2>
}

light_source { <0, -20, 0>  color rgb <1, .7, .3>*10 spotlight point_at 0 }

isosurface {
  function { y-.5*f_wrinkles(x,y,z) }
  contained_by { box { <-50,-50,-50>, <50,1,50> } }
  material {
    texture {
      pigment { color rgbft <0.1, 0.6, 0.8, 0.6,.4> }
      finish { diffuse 0.01 specular 0.6 reflection .2 conserve_energy}
    }
    interior {
      ior 1.5
    }
  }
 }
// -------------------

I do note that it goes away if both f and t are set to zero (but not if either
remains non-zero).

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