Is this a fossil?

Is this a fossil?

Observation - Is this a fossil?. Description: Chipping concrete from a farmhouse wall in Lanarkshire, I dislodged a flake od the old sandstone. It showed two finger-like ridged lines. I propped the stone up under a lamp to highlight this feature.

Chipping concrete from a farmhouse wall in Lanarkshire, I dislodged a flake od the old sandstone. It showed two finger-like ridged lines. I propped the stone up under a lamp to highlight this feature.