I am very sorry to let you know that the ShovelBums Field School Directory is on an extended temporary hiatus. The tool I was using to post field schools (not jobs, only field schools) is no longer supported and I have not found a suitable replacement. I did hire a contractor to create a product for me, but then they bailed after several months of delays. I will keep you updated on any progress I make.
I am hoping to get the directory back up for 2019. You can browse the last directory here: https://web.archive.org/web/20160612143756/http://shovelbums.net/index.php/view-field-schools