Re: Geology of a recently terraformed planet


coyu@xxxxxxx wrote:
Robert A. Woodward wrote:

sigidunum@xxxxxxxxx wrote:

2) No limestone; limestone is made from the shells of microscopic
marine animals. So, no marbe -- that's just limestone metamorphized
by heat and pressure. (Marble may be a fantastically valuable luxury,
available only as an import from Earth). No limestone caves, either.

Doug, I believe that there are pre-Cambrian limestone beds.

You beat me to it. Calcium carbonate can precipitate out of oceans
abiogenically. So can magnesium carbonate (dolomite, but this gets
complicated).

---OT, sort of: have the discoveries of the last few
years changed the conventional wisdom about ter-
raforming Mars? Harder or easier?

Gah. Y'know, these discussions always depress
me. The rest of the solar system is just so ... dull.

Whatever. It's beautiful here in Boston today.

Hasta,

Noel

.

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