The images (SOL 735) were taken by NASA’s Mars rover Curiosity onboard Mastcam on August 31, 2014.
According to UFOvni2012, one of the anomalies found in the image looks like a carved broken animal statue. The anomaly has all the characteristics to define that it is not just a simple rock.
Another anomaly looks like a fossilized backbone, furthermore, ancient sculptures and stones/rocks with deep carved lines with unnatural angles which seems impossible to be due to erosion.
Read more: http://ufosightingshotspot.blogspot.com/2015/01/ancient-aliens-on-mars-curiosity .html