PT - JOURNAL ARTICLE AU - Josiah Edward Spurr TI - The stratigraphic position of the Thomson slates [Minnesota] AID - 10.2475/ajs.s3-48.284.159 DP - 1894 Aug 01 TA - American Journal of Science PG - 159--166 VI - s3-48 IP - 284 4099 - http://www.ajsonline.org/content/s3-48/284/159.short 4100 - http://www.ajsonline.org/content/s3-48/284/159.full SO - Am J Sci1894 Aug 01; s3-48