Open davenquinn opened 2 months ago
https://dev2.macrostrat.org/projects/1/columns/415#unit=11118
See https://pubs.usgs.gov/bul/1774/report.pdf
https://dev2.macrostrat.org/projects/1/columns/415#unit=11118
See https://pubs.usgs.gov/bul/1774/report.pdf