Suborder Redlichiina, Superfamily Paradoxidoidea, Family Xystriduridae,
Christmas Hills, Mount Isa, Australia
trilobite is of a member of the Order Redlichiida, Family Xystriduridae,
with genal spines attached, a feature often not preserved intact.
This one comes from Mount Isa in Australia. Some of the richest
ore-bodies in Australia occur in a great mass of severely deformed
and altered (metamorphosed) rocks at Mt Isa in north-west Queensland,
One rock unit, originally shale deposits, contains abundant fossil
micro-organisms, interpreted as blue-green algae. The trilobite
beds date from the Middle Cambrian, around 520 million years ago,
and they rest directly and unconformably on older metamorphic rocks
such as those containing the Mount Isa orebodies.