Columnar Jointing Rupnica - Geopark Papuk, Croatia - Philatelic Photographs on Waymarking.com

This waymark is about Columnar Jointing Rupnica in Geopark Papuk, Croatia and souvenir sheet issued by Croatian Post. Rupnica location is under protection as geological monument of nature since 1948.

"Columnar jointing is a geological structure where sets of intersecting closely spaced fractures, referred to as joints, result in the formation of a regular array of polygonal prisms, or columns. Columnar jointing occurs in many types of volcanic rocks and forms as the rock cools and contracts." (Source: Wikipedia)

Columnar jointing at Rupnica site is formed in albite rhyolite volcanic rock. The majority of rock columns at the site are four- and five-sided. Potassium–argon dating of these rocks gave Cretaceous age, about 70 million years.

There are several geological educational info boards around this site that educate visitors about geological details of this site. There is a wooden walkway around this site so visitors can explore the site from all directions. The parking is next to the site. Access is free and it is opened to the public without any restrictions 24/7.

Souvenir sheet that depicts Rupnica location is issued by Croatian Post on 24th October 2016. Total number of issued souvenir sheets is 30000. Souvenir sheet is designed by Dean Roksandic, designer from Zagreb. It is part of multi-year set dedicated to minerals and rocks of Croatia.

Stamp Issuing Country: Croatia Date of Issue: 24th October 2016 Denomination: 6.50 Color: multi-color Stamp Type: Single Stamp Relevant Web Site: [Web Link]

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