Zc144. This is a large piece of concrete that landed on the parapet of Battery Ramsay and seems to be buried in the ground. I wonder, might that be the 10 ton piece described in the paragraph below; it is from the 2nd link above. This is a 2010 image.
On May 2, Battery Geary, 12-inch Seacoast Mortar Battery, was blown up due to the enemy artillery fire penetrating the powder magazines. Flying concrete from this explosion, landed in our battery position. One five hundred pound piece landed on a fox hole within the battery position, injuring one Pvt. Floyd E. Goode, to the extent that he died on the way to the Hospital. Another large block of about 10 tons landed between the director and height finder and buried itself level with the ground.