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The two pictures above look like a giant sead pod (7"/4")
2 above back and front images
The upper ones are ironstone concretions; probably nothing fossil about them, though there is a chance there's a fossil at the core. Their concentric zoning is typical.
I give an explanation of concretions in a couple of my posts in this topic, eg.
The lower two: probably just chance strange patterning due to the vagaries of weathering.
Interesting finds, I agree with Mike on the Ironstone concretions but I think the lower two could be a mineral that 'grows' and looks like a plant.
Sorry but I have forgot what it is called.
You're thinking of dendrite. It is a fair thought but I don't think quite right here; not the right morphology.