Air core drilling can occasionally produce small chunks of cored rock. Eventually, the glacial ice is replaced by ice cored rocks. The turret, even without the siliceous cored armor, provided improved ballistic protection. One well cored the Alum Shale section. The crankshaft was cored out to make it both lighter and stronger. The Ute Mountains to the south are cored by igneous intrusions and rise to . Before fluoridation the molars of the nation's children were soon cored with amalgam. The tree was cored by Edmund Schulman in the late 1950s, but was never dated. The Black River trees were cored by dendrochronologist David Stahle from the University of Arkansas.