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Venezuela issued in 1982 four speleological stamps. The Bs. 2 shows speleothems in the Guacharo Cave. The Bs. 1.50 is an aerial view of the huge Sarisarinama Shafts. In the centre is the Humboldt Shaft, while at the top of the picture the Martel Shaft is just visible. These sinkholes are in quartzite, end the Humboldt Shaft is the biggest cave known in sandstone - 340 m deep end 370 m wide. Bs.1 - Mount Autana. This is also an aerial photograph. High on the east-side of this mountain are twelve cave entrances, which are not clearly to see on this stamp. These pits end caverns are considered to be the most ancient caverns on earth - between 1590 end 1250 million years old. Finally was also the famous Guacharo-bird depicted on a stamp at the end of 1982.

Bibliography:

White, William B., G.L. Jefferson et J.F. Haman: 1966
"Quatzite Karst in Southeastern Venezuela"
Int. Jour. Spel., 2:309-314.

Natura - Caracas, Mayo-1976 nr 58 Spelunca 1974 nr 4

Boletin de la Sociedad Venezolana de Ciencias Naturales
Tomo XXII - Marzo 1976 - Nos.132/133