The guano holes: a new corrosion form from Natuturingam Cave (Palawan, Philippines)

Abstract

A totally new corrosion form has been recently observed inside the Natuturingam cave (better known as Puerto Princesa Underground River) in Palawan (Philippines): the guano holes. They consist of perfectly rounded holes, 4–5 cm wide and up to 10–15 cm deep, developing over a flat limestone surfaces covered by a thin layer of fresh guano

Keywords

• guano holes
• corrosion form
• climatic control
• genetic mechanism
• cave minerals