Unusually small burrows, i.e., tiny tubes that run through the rock in a parallel arrangement from top to bottom, were discovered in marble and limestone of these desert regions. In the desert ...

Unusually small burrows, i.e., tiny tubes that run through the rock in a parallel arrangement from top to bottom, were discovered in marble and limestone of these desert regions. The paper is ...

Marble sample from Namibia: Starting from two crevices filled with light-colored crustal limestone, the tubes have grown downwards in a parallel arrangement. Credit: Cees Passchier Professor Cees ...