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Blackberry Hill
Blackberry Hill is a series of quarries and outcrops in Central Wisconsin that is notable for its large concentration of trace fossils in Cambrian rocks. One quarry in particular, located in Marathon County, also has the distinction of preserving some of the first land animals. The site is a prolific Cambrian Konservat-Lagerstätte. It includes three-dimensional casts〔Collette and Hagadorn, 2010〕 of soft bodied and lightly scleritized invertebrates and a variety of exceptionally preserved types of trace fossils.
== Age and stratigraphic placement ==
The strata at Blackberry Hill are known to belong to the Elk Mound Group;〔〔Schieber et al., 2007〕 however, the lack of good stratigraphic markers (i.e., index fossils) in some Blackberry Hill localities, coupled with uncertainties about the age range of the Elk Mound Group itself, make it difficult to assign a precise age to these strata. Many researchers consider these rocks to be Late Cambrian,〔〔Getty and Hagadorn, 2008〕 which is the age to which the Elk Mound Group was originally assigned;〔Ostrom, 1966〕 however, some recent authors now believe the Elk Mound Group and the fossils of Blackberry Hill could date back to the Middle Cambrian, based on certain fossils obtained from other areas.〔Seilacher and Hagadorn, 2010〕〔Young and Hagadorn, 2010〕
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