| Description | Rough geological colouring with key and a small number of pencil notes by George Bellas Greenough, February 1850, on base map 'Minerographische Carte des Altaischen Porphyr und Jaspis Gebuerges', engraved by J G Klinger, published by I Z Logan, 1797. Greenough no.2381. 62cm x 54cm, dissected on cloth. Greenough indicates that the colouring is after Pierre de Tchihatcheff.
Taken from publication, 'N Nord. Beytr, VI Th, III Pl'. |