@misc{indiciae87dd34ebcf14,
  title = {Stratigraphy, descriptions, and physical properties of sediments cored in Lake Michigan},
  author = {Steven M. Colman and D. S. Foster},
  year = {1990},
  doi = {10.3133/ofr90478},
  url = {https://pubs.usgs.gov/publication/ofr90478},
  note = {Source identifier: ofr90478}
}