PT  - JOURNAL ARTICLE
AU  - Othniel Charles Marsh
TI  - Geological horizons as determined by vertebrate fossils
AID  - 10.2475/ajs.s3-42.250.336
DP  - 1891 Oct 01
TA  - American Journal of Science
PG  - 336--338
VI  - s3-42
IP  - 250
4099  - http://www.ajsonline.org/content/s3-42/250/336.short
4100  - http://www.ajsonline.org/content/s3-42/250/336.full
SO  - Am J Sci1891 Oct 01; s3-42