sandstone monument

[low_delta]

While marble is dissolved by the chemicals in the atmosphere and in rainwater, sandstone is not. It is, however, vulnerable to abrasion by running water or by particles in the wind. Once water found a soft spot in the stone, it would eat it away more and more as it ran through.

Comments

Re: erosion

[low-delta.livejournal.com]

They're both impervious in certain respects. Marble tends to simply dissolve over time. Sandstone only erodes where water collects and runs down the side. And I think sandstone is a little more fragile.