Last Edit: Nov 11, 2014 8:59:57 GMT -5 by bobson: http://mars.jpl.nasa.gov/msl-raw-images/proj/msl/redops/ods/surface/sol/00785/opgs/edr/ncam/NRB_467190267EDR_F0440036NCAM00350M_.JPG
This intriguing image below from Gusev crater is of an object which is extremely similar to a spine. It was discovered by Mars Anomalies member, convex: