Trinil
A look at the intentional markings of Homo erectus
Looking at a 2014 paper by Josephine Joordens and coworkers, which describes zig-zag markings on a shell from Trinil, Indonesia. This shell may have been intentionally marked by Homo erectus.
A new study of old shells shows shoreline resource use by Homo erectus
Notes on a study by José Joordens and coworkers on the Trinil collection associated with Eugene Dubois' original Pithecanthropus dig