Dallas, Texas - Austin Chalk - Leaf Or Trace?

[TXTechdad]

This chunk was found in an Austin Chalk area of Dallas, Texas.

Are these leaves or trace fossils, or something else? The first 5 pictures are of one side of the rock, the next ones are of the other side which has a similar, smaller fossil.

Cheers,

Sergej

[Indy]

Resembles a fern leaf but I suggest
what we have here is dendritic mineral ... Link

[vertman]

I agree. I don't believe this particular specimen to be a fossil.

[TXTechdad]

Thanks for the responses, interesting! Some of the examples on the Wikipedia page are rather stunning!