Rare Xystridura Trilobites Death Assemblage
From Cambrian Australia

Well-preserved example of a death assemblage of a member of the Order Redlichiida, Family Paradoxididae, with genal spines, 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 Mt Isa orebodies. Trilobites from Australia are not often available to collectors, and few with the completeness and detail of this one are offered, particularly when no less than FIVE individuals are represented, 2 of which are quite complete.