There is excavation for a housing development behind our home. On examination of some large excavated limestone boulders, I noticed what appeared to be a cross-section of thoracic (rib cage) of a skeleton. I suspect it is a fossil, being that there is a noticeable pattern within the same layer of sedimentary rock. I've attached a picture, please note the rust colored protrusions within the blue-gray limestone boulder. Thank you for any input on whether my suspicions are reasonable. If so, I intend to contact the construction company as to the location of where the boulder was excavated, and whether they are agreeable to removing it from construction use.