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Freshwater calcium carbonate.
calcareous sinter
calc-sinter
1
The formation is soft
calcareous
tufa
,
such as forms the bottom of all this basin.
2
The valley, which gradually widens, is bordered with hills of
calcareous
tufa
,
called here tierra blanca.
3
The fossil bones which lie in the
calcareous
tufa
of this region will yet, we hope, reveal the ancient fauna.
4
Formed of
calcareous
tufa
5
These rocks, in the southern part of the country especially, are often covered with twelve or fifteen feet of soft
calcareous
tufa
.
6
"It's
calcareous
tufa
I'm a-wearing, wove on me by exudation and accretion in the past two thousand years."
calcareous
tufa
calcareous