The Deerlijk 404 well in the Brabant Massif of Belgium includes graptolite
faunas of the Parakidograptus acuminatus and Cystograptus vesiculosus zones
. The base of the Silurian is not reached, as the well stopped in the middl
e part of the Parakidograptus acuminatus zone. Ten species of graptolites a
re described and figured for the first time from Belgium.