The rock appears to weep because it is porous limestone and rainwater seeps through the pores.

It's porous limestone and less than ten feet thick.

Its exposure to the prevailing west winds meant that rain was soon permeating the porous local limestone.

Though it was only 3 miles long it could not hold water, being dug into porous limestone.

But there's definitely porous limestone down there, and those stains in the folds of the cliff do look like water.

The snow acts as a blanket protecting the plants, and the melt drains quickly through the porous limestone in spring.

In sandstones and porous limestones there is a continuous layer of water throughout the formation.

It is characterised by thick deposits of chalk, a soft porous white limestone, deposited in a marine environment.

An additional severe limitation for any humans is that Henderson has no streams or reliable freshwater sources, because the island consists of porous limestone.

This water is actually from Thompson Lake, some two miles (3 km) away, which makes its way through the porous limestone until it exits here.