QUESTION:
I was wondering if the rover camera resolution is sufficient to determine
the sorting range of the sediment surrounding the smaller gravelly debris. 
One diagnostic of high-concentration flows is a narrow sorting index in the
supporting matrix of the resulting deposition.  Obviously, the rover doesn't
have a sieve shaker.  Do you have a method for getting a rough size
distribution?

Also, have your sedimentologists said much about the resemblance of the
gravelly foreground to bedload sheets often seen in gravel rivers, or am I
being fooled by the dust?

ANSWER from Jeff Plescia on July 15, 1997:
The rover mounted cameras are relatively poor quality and do not have the
resolution to look at the size of the fine grained particles.  Things would
need to be at least of few mm in diameter to be resolved if the images were
taken up close.  There is essentially no way to get the size frequency
distribution on the fine grained material.