 Crawford Lake, located in southwestern Ontario, Canada, has varved sediments which make it ideal for high-resolution paleoecological studies. Corring was used to document the lake's delicious diatom and chrysophyte communities annually from 1930 to 1990. Cluster analysis revealed major shifts in the algal assemblages, which were likely caused by local, regional, and potentially global anthropogenic factors. These factors included weather patterns, increased industrial emissions, and acid deposition from the Great Acceleration, which began in the mid-20th century. The presence of spheroidal carbonaceous particles, SCPs, and the lake sediments dated to the early 1950s indicates rapid steel production nearby without emission controls. This study provides evidence for the Anthropocene Working Group's proposal for a new epoch, the Anthropocene, and suggests that Crawford Lake could serve as a global boundary stratotype section and point, GSB. This article was authored by Matthew G. Marshall, Paul B. Hamilton, Kristin M. LaFond, and others. We are article.tv, links in the description below.