page_title: UW–Madison Geology Museum
section_title: Biosignatures exhibit
hierarchical_section_title: UW–Madison Geology Museum / Exhibits / Biosignatures exhibit
caption_attribution_description: English: Silurian worm, probably a leech, from the Waukesha Biota, Brandon Bridge Formation, Waukesha, WI; UWGM 2422.
context_page_description: The UW–Madison Geology Museum is a geology and paleontology museum housed in Weeks Hall, in the southwest part of the University of Wisconsin–Madison campus. The museum's main undertakings are exhibits, outreach to the public, and research. It has the second highest attendance of any museum at the University of Wisconsin–Madison, exceeded only by the Chazen Museum of Art. The museum charges no admission.
context_section_description: This exhibit highlights the chronology of the Earth and the signal left by life on the planet.  Features include
  A block containing debris from the Sudbury impact 1.85 billion years ago
  Stromatolites from the Ordovician of southwestern Wisconsin
  Soft-bodied fossils, such as the enigmatic Grypania and a possible Silurian-age leech.
  A large Winogradsky column
caption: Annelid worm, possibly the earliest leech, from the Silurian Waukesha Biota, Wisconsin.
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