Description of the Graptolites found in the Black Shales of Dumfriesshire

• 1 February 1851
• journal article
• Published by Geological Society of London in Quarterly Journal of the Geological Society
• Vol. 7  (1-2) , 58-65
• https://doi.org/10.1144/gsl.jgs.1851.007.01-02.16

Abstract