Anyway, let me know if the leaves turning black is something to work on, or is this to be expected and just part of the process. Thanks in advance for any suggestions.
Looks like a major 'wet pack' scenario to me. Not sure if the black is good or bad, 'slimy' might not always smell.
At least it's out in the open with lots of sun and air, that will help.
As long as you make sure it stays stirred up, might make some nice soil.
Hopefully it breaks down before it freezes solid,
or snow melt season may not be pleasant there.
Wood chips might not be a good
soil ingredient,
if not fully broken down it will 'steal' nitrogen from plants.
'Aging' wood chippings is a relative thing.
Can depend on if they are chipped in summer(wetter) or winter(drier),
how much and what kind of organisms are present growing on the tree,
the micro-environment they are used and/or stored in,
and what kind of wood it is(some break down faster than others).
Moderation, common sense, and a bit of biology knowledge can go a long way with composting
and chickens.