"Heterococcoliths"
Count: -
   "Placoliths"
  Count: †3o10f63g
     Order †Arkhangelskiales (Bown & Hampton, 1997)
    Count: †2f8g
       1 Family †Arkhangelskiellaceae Bukry (1969)
      Count: †5g
       2 Family †Kamptneriaceae (Bown & Hampton, 1997)
      Count: †3g