The volume documents the field work of Robert J. Horodyski in Montana, undated. Notes are headed with location, followed with notes on terrain and observations of stromatolites. Most entries comprise tables of data on samples(thickness, lithology, sed. u (mm), aud. g.s., dolo.). Locations include sites across Glacier National Park, such as Snowslip Pollock Spur, Mount Reynolds, and Swiftcurrent mountain.
Many of SIA's holdings are located off-site, and advance notice is recommended to consult a collection. Please email the SIA Reference Team at osiaref@si.edu.