Want Them All

Thanks guys,
One more question: my yard was originally covered with wood barks that are kinda large, they look reddish brown, and haven't broken down much in 5 years. They are very hard, I suspect that they will never decompose, or maybe in 50 years! I wish the landscaper would've used the finer wood chips. Anyways, should I:

[1] replace all the hard wood barks with the manure, or
[2] remove the barks, place manure layer, and reapply the barks on top, or
[3] spread the manure layer on top of the wood barks

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