old school foundation blocks

These blocks have almost terracotta looking material, multi chambered, 12-14" sqaure. Found in fair haven nj. House built about 1947. I do not know what to call the type of foundation…its in good shape. I’m sure one of my more knowledgeable peers could helpme-thanks

http://www.oldhouseweb.com/how-to-advice/structural-terra-cotta.shtml

http://www.nachi.org/bbsystem/viewtopic.php?t=6202&PHPSESSID=9903d7d68527f9f869b125a0e91ea96b