page_title: List of the Paleozoic life of Illinois
section_title: X
hierarchical_section_title: List of the Paleozoic life of Illinois / X
caption_attribution_description: English: Xylobius moniliformis, H. "Woodw., sp. nov. Soapstone bed, Lower Coal-measures&#160;: Carre Heys, Colne, Lancashire. Enlarged twice natural size. d, dorsal aspect of specimen&#160;; p, walking-feet.
context_page_description: This list of the Paleozoic life of Illinois contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Illinois and are between 541 and 252.17 million years of age.
context_section_description: †Xyloiulus
  †Xyloiulus frustulentus – type locality for species
  †Xyloiulus mazonus – type locality for species
caption: Illustration of a fossil of the Carboniferous millipede Xyloiulus
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