At 150 feet down I imagine these polygons are fairly large - on the order of tens of feet across to be able to be imaged by GPR.
It could be dessication or freeze/thaw, but they are below an impact crater. I wonder if they could have been caused by the impact? A layer of stiff buried material at the time of the impact, and ending up looking like shattered glass?
I get a kick how EVERYTHING now-a-days gets referenced to climate change.
Your gas guzzling SUV caused these peculiar patterns on Mars... somehow.
I might add that the ambiguity of the scale of the image is an excellent reminder of the fractal nature of the physical universe. Is it a planet, is it a fleck of Michael Moore’s dandruff?