“Camden has given a rude [crude] representation of two caverns near Tilbury in Essex, “spacious caverns in a chalky cliff, built very artificially of stone to the height of ten fathoms [18 metres, or [...]
I think the place mentioned is probablyCarrick, and in particular either the neolithic Carrick East Burial Chamber or Carrigadoon Hill, but I am not certain. At any rate the text makes clear that it i [...]