Benson.—Palaeozoic and Mesozoic Seas in Australasia. 31 
mision sep ges involved in the institution of the Gympie series (Jack, 1892) 
are now fairly clear. To this region we return, but digress here to consider 
events in the west. 
** Permo-Carboniferous ” or Permian. 
Towards „the close of Carboniferous times the sea entered the north- 
ia hich were laid down tillites, shales, 
fessor David (1919) with interesting results. There appear in it typical 
members of the Lower Carboniferous fauna mingled with members of 
the Himalayan or Salt Range fauna, such as НехадопеПа crucialis, 
- PERMIAN 
"n ЇЇ 
И 
= Perma Coa Measures 
[; ail 
ting o 
ES Tethyan Permian Sea = cose 
Eastern ide ewe: rte PRU М d ui а. 
Sea ond exposed sediments ' i 
Derya senilis, e — Productus eti ct red une 
hse ey or Upp 
Western Australian à Northern Territory s o ей ne hand as | 
those of eastern Australia on the other. Out of adh two mas species 
recorded in the Permo-Carboniferous marine fauna of eastern Australia 
and Tasmania, only about nine are at present known to be common to 
the two” (David, = 
