tufa
calc-tufa , auch: calc-tuff , auch: tophe

The pieces were used to patch and restore the old tufa.

Tufa is common in many parts of the world.

On the one hand, chalk tufa is being washed away partly.

It is a one story "pair house" built of soft tufa rock.

The vegetation and debris then become the area for tufa accumulation.

The name of the lake comes from the impressive tufa formations nearby.

There is a Tufa spring close to the tunnel.

To better protect his baby this looks like, but really to hide the fact that it's volcanic tufa.

These are the best examples of what are known as tufa towers.

As a consequence, deposits are, in general, less porous than tufa.

Tufa deposits form an important habitat for a diverse flora.

Evidence for this is seen in the use of tufa, a material of local origin.

This caused the lake to fall, exposing unique tufa formations.

This could be a mechanism for potentially increasing tufa formation through the reach.

The ancient shoreline is evidenced by tufa formations throughout the area.

Directly built on tufa stone, his original part dates back to the eleventh century.

The third recognized mechanism for tufa development is the active role played by the biota.

A stone carved from red tufa is situated at the right of the entrance upon a low rock wall.

Bookshelves and closets have been chiseled into the tufa stone.

Tufa, which looks like crumbled biscuits, is a naturally porous stone.

This area also has some interesting tufa formations.

Water purity is the decisive factor for tufa formation.

The southern group, includes 200 tufa formations aged 32,000 to 100,000 years old.

Both the materials, sandstone and tufa, and the models were taken from there.

Tufa Rutan, realizing what was happening, refused medical treatment to try to save his children.