So you think you know how to interpret ripple cross lamination do you?
Well take a look at this:
McIlroy, D. 2010. Biogenic cross lamination produced by the shrimp Alpheus bellulus in microcosm experiments. Journal of Sedimentary Research, 80, 151-154.
A couple of years ago Alex Liu found some remarkable trails in the Mistaken Point Formation, just above the E surface which houses so many beautiful Ediacaran body fossils.
What is so remarkable about finding trails?
Well authenticated trace fossils are not known from rocks of this age (565 Million years ago).
There is little evidence that Ediacaran macrofossils could move.
Microbial mats have been widely invoked as being part of the mechanism by which the soft bodied Ediacara fauna are preserved. Consensus seems to be settling upon microbes growing upon the surface of dead ediacarans forming a kind of death mask that allows the unmineralized tissues to be exceptionally preserved.
This laboratory experiment turns that somewhat on its head.
By placing a piece of seaweed on a well established microbial mat we found that it was possible to smother the mat, and produce a negative impression on the matground surface in the shape of the seaweed.